JP2001251265A - Time division multiplexer - Google Patents

Abstract

PROBLEM TO BE SOLVED: TO provide a DTM(time division multiplexer) which simplifies its TSW part for miniaturization and can perform the division multiplexing of transmission signals of various transmission rates. SOLUTION: The voice signals of voice circuits 651-652N, having a number 2N of CHs and the signaling signals of SS/SR lines 661-662N, corresponding to the circuits 651-652 are multiplexed by every two CHs by ADPCM IF modules 691-69N and converted into 64k voice signals and ST multi-frames. Then a TSW part 72 of 64k unit TSW performs switching of those voice signals and multi- frames according to the setting of allocation, that is indicated by the control signal sent from a control part 75. These switched signals and multi-frames are inserted into the frame formats of transmission lines 671 so an of 1.544 Mbps and transmission lines 681 and so on of 6.312 Mbps via transmission IF modules 701,..., 711 or the reverse.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a time-division multiplexing apparatus, and more particularly to a time-division multiplexing apparatus for time-division multiplexing transmission signals having various transmission speeds and transmitting them on a high-speed transmission line.

[0002]

2. Description of the Related Art 1.544 megabits per second (hereinafter referred to as Mb
Abbreviated as ps. ) And a signal such as an image signal or a data signal of a video conference or the like through a large-capacity high-speed digital dedicated line such as 6.312 Mbps.
Abbreviated as TDM. ) Is time-division multiplexed and transmitted efficiently. In such a TDM, a low-speed transmission signal is time-divided into predetermined speed units, and a time switch (Time SWitch:
Hereinafter, it is abbreviated as TSW. ), The data is rearranged and multiplexed in an arbitrary order for each division unit, and transmitted as a high-speed transmission signal. Or do the opposite. The TDM interface (InterFace: hereinafter abbreviated as IF) is described in The Telecommunication Technology C
ommittee: Hereinafter abbreviated as TTC. ) Has been standardized.

[0003] Among the standardizations performed by the TTC, TDM
-TTC standard JJ-20-3 which specifies IF between TDM
Reference numeral 1 denotes 64 kilobits per second (hereinafter abbreviated as kbps) sampled at a sampling period of 125 microseconds (μs) and PCM-encoded on the basis of transmission of an audio signal.
(8 bits) is defined as a division unit, and it is specified that a transmission signal of 64 kbps or less is multiplexed to 64 kbps and transmitted. 32 kbps as a transmission signal of 64 kbps or less
Adaptive Differential Pulse Code Modulat which is highly efficient coded to ps (4 bits)
ion: hereinafter abbreviated as ADPCM. ) Encoded audio signals,
Bearer signal, SR (Signal Receive), which is an individual line signal system that has a separate signal path for each voice line with the exchange
Set the SS (Signal Send) line / SR line used for the system to 0.
There are signaling signals sampled at 8 kbps or 1 kbps. The bearer signal is 3.2 kbps,
6.4 kbps, 12.8 kbps, 19.2 kbp
s, 25.6 kbps.

FIG. 27 schematically shows the structure of a conventional TDM. The TDM is a channel in the low-speed transmission path side (CHannel:. Hereinafter abbreviated as CH) number 2N (N is a natural number) SS line / SR lines 11 ₁ corresponding to the voice lines 10 ₁ to 10 _2N and each voice line 11 _2N and CH number is M
(M is a natural number) is connected to the data signal line 12 ₁ to 12 _M of high speed transmission to the roadside 1.544Mbps transmission path 13
₁ ... a 6.312Mbps transmission path 14 ₁ ... and are connected. The TDM multiplexes a voice signal and a data signal, which are low-speed transmission signals, and transmits the multiplexed signal as a high-speed transmission signal to a high-speed transmission line, or divides a high-speed transmission signal from the high-speed transmission line into a low-speed voice signal and a data signal. Signal to each low-speed line.

[0005] Such TDM is, ADPCMIF module 15 ₁ to 1 with the IF module, the IF function each between the low-speed side of the voice lines 10 ₁ to 10 _{2 N}
5 and _2N, and bearer rate modification unit 16 ₁ ~ 16 _M as the data communication IF module having a IF function each between the data signal line 12 ₁ to 12 _M, the high-speed side 1.544M
bps transmission line 13 ₁ ..., 6.312Mbps transmission path 14 ₁
, And transmission line IF modules 17 ₁ , 18 _1, ... Each having an IF function.

[0006] Further, TDM is a technique for transmitting high-speed signals from a low-speed transmission path.
Multiplexing direction to transmission side, high speed transmission side to low speed transmission side
About the separation direction to the PC of 64 kbps
M-encoded audio signal (8 bits) × K (K is natural
Memory 19 having a capacity of "number)" ₁, 19_Two64 kb with
64k unit TSW20 that switches in units of ps
Similarly, 8k units that perform switching in 8 kbps units
Switching in units of 0.4 kbps with TSW
An audio signal TSW21 including a 0.4 k unit TSW;
Switching in 3.2 kbps units 3.2 k units
And a data signal TSW22 having a TSW.

[0007] Each IF module 15 ₁ to ₁ on the low speed side
And 5 _2N, 16 ₁ ~16 _M, the audio signal TSW21 and data signals TSW22, are connected via a bus 23. Audio signal TSW21 and data signal TSW22
And the 64 k unit TSW 20 are connected via a bus 24. The 64k unit TSW 20 and the high-speed IF modules 17 ₁ , 18 _1, ... Are connected via a bus 25.

Further, the TDM has a control unit 26, and in accordance with control signals 27 _{1 to} 27 ₄ , the allocation setting for the 64k unit TSW 20 and the setting of the audio signal TSW 21 are performed.
Allocation setting for k unit TSW and 0.4 k unit TSW,
Assignment of the data signal TSW22 to the 3.2k unit TSW can be set.

ADPCMIF module 15₁~ 15_2N
Means each voice line 10₁-10 _2NAD corresponding to
PCM encoding unit 28₁~ 28_2NAnd for each voice line
S used for the SR system which is the provided individual line signaling system
Sampling unit 29 corresponding to S line / SR line₁~ 29_2N
And The signal is transmitted on the SS line and received on the SR line.
Be trusted.

[0010] ADPCM encoding section 28₁~ 28_2NIs each
Voice line 10₁-10_2NAnalog audio signal encoding
Go to the 32 kbps ADPCM coded audio signal 30
₁~ 30_2NGenerate Or, conversely, 32 kbp
s ADPCM encoded audio signal 31₁~ 31_2NDecrypt
To generate an analog audio signal,₁~ 1
0 _2NTo send to. Sampling unit 29₁~ 29_2NIs each
S which is an individual line signal system provided corresponding to the voice line
0.8k SS signal of SS line / SR line used for R system
Hz sampling signal 32₁~ 32
_2NGenerate Or conversely, 0.8kHz signal
Ring signal 33₁~ 33_2NAs an SR signal.

The ADPCM encoded audio signal 3 which has been ADPCM encoded by the ADPCM encoding sections 28 _{1 to} 28 _2N
0 ₁ to 30 _2N are connected via a bus 23 to 32 channels having 2N channels.
8k of audio signal TSW21 as kADPCM audio signal
The data is supplied to the unit TSW and multiplexed. On the other hand, the 32k ADPCM audio signals 31 _{1 to} 31 _2N divided for each CH by the 8 k unit TSW of the audio signal TSW 21 are supplied to the ADPCM encoders 28 _{1 to} 28 _2N of the corresponding CHs via the bus 23. . Sampling section 29 _1-
Signaling signal 3 sampled by 29 _2N
2 ₁ to 32 _2N are via bus 23, CH number is supplied to 0.4k units TSW audio signal TSW21 as a signaling signal of 2N, it is multiplexed. On the other hand, the audio signal TS
Partitioning signaling signals 33 ₁ ~ 33 _2N for each CH by 0.4k units TSW of W21 is via the bus 23, CH of the sampling portion 29 21 _to the corresponding
Supplied to 9 _{2 N.}

8k TS in audio signal TSW21
W, according to allocation setting indicated by the control signal 27 ₂ from the control unit 26 performs switching to the 8kbps units, CH number number by multiplexing 32kADPCM audio signals 30 ₁ to 30 _2N of 2N CH is N 64 kbp
s of the audio signal 36. Or conversely, CH
A 64 kbps audio signal 37 having N channels and 2N channels
32 kbps 32k ADPCM audio signals 31 _{1 to} 3
Divide into _12N . 0.4 in the audio signal TSW21
k units TSW according allocation setting indicated by the control signal 27 ₃ from the control unit 26, 0.4 kbps
Switching is performed in units, and the signaling signals 32 _{1 to} 322 _N having _2N channels are multiplexed to form a 64 kbps S signal.
T (STatus) multi-frame 38 is converted. Or conversely, the ST multiframe 39 of 64 kbps is
CH speed is divided into a signaling signal 33 ₁ ~ 33 _2N of 2N.

FIG. 28 shows an outline of the configuration of the 32 kbps 32 k ADPCM audio signal and the 64 kbps audio signal shown in FIG. FIG.
kbps of 32kADPCM voice signal 30 ₁ ~30 _2N,
Shows an overview of 31 ₁ ~31 _2N configuration. FIG.
The outline of the configuration of the 4 kbps audio signals 36 and 37 will be described.
That is, in the IF module, the 32 k ADPCM audio signal is sampled at 8 kHz from the analog audio signal, and is represented by 4 bits b _{1 to} b ₄ per CH.
It becomes a transmission signal of 2 kbps. 8 of audio signal TSW21
The k-unit TSW converts this 32 k ADPCM audio signal into 8 k
Switching in units, multiplexing 2CHs, 64
Convert to a kbps audio signal.

FIG. 29 is a circuit diagram showing the 0.8 kbps shown in FIG.
1 shows an outline of the configuration of the signaling signal of FIG. As described above, the signaling signal is obtained by sampling the SS line / SR line provided for each audio line in the IF module at a cycle of 0.8 kHz.

FIG. 30 shows an outline of the configuration of the 64 kbps ST multiframe shown in FIG. FIG. 3A shows an outline of the configuration of the ST multiframes 38 and 39 of 64 kbps. FIG. 2B shows an example of allocation of each time slot (Time Slot: hereinafter abbreviated as TS). That is, ST multiframe 3
8, 39 are transmission signals of 64 kbps of 8TS,
Each TS is transmitted at a cycle of 1.25 milliseconds (ms). Each TS includes a 1-bit F / A bit in which an F bit indicating the head of a frame and an alarm bit indicating occurrence of an alarm are alternately output, and CH9, CH2, CH1,... Of 0.8 kbps signaling, for example. A multi-frame configuration including a total of 10 bits including 9 bits arbitrarily assigned.

The bearer rate converters 16 _{1 to} 16 _M have transmission rates of 2.4 kbps, 4.8 kbps, and 9.6 kbps.
s, 14.4 kbps, or 19.2 kbps, each of which has an 8-bit transmission rate of 3.2.
kbps, 6.4 kbps, 12.8 kbps, 19.
2kbps, 25.6kbps bearer signal 40 _1-4
To generate a 0 _M. Or conversely, 3.2 kbps,
6.4 kbps, 12.8 kbps, 19.2 kbp
s, from 25.6 kbps bearer signals 41 _{1 to} 41 _M ,
2.4 kbps, 4.8 kbps, 9.6 kb respectively
ps, 14.4 kbps, and generates a synchronization signal 19.2 kbps, and sends to the data signal lines 12 ₁ to 12 _M.

The bearer signals 40 ₁ to 40 _M converted by the bearer speed converters 16 _{1 to} 16 _M are transmitted via the bus 23 to
The number of CHs is supplied to the data signal TSW22 having the 3.2k unit TSW as a bearer signal of M and multiplexed.
On the other hand, the bearer signals 41 _{1 to} 41 _M divided for each CH by the data signal TSW 22 are supplied to the bearer signal converters 16 _{1 to} 16 _M of the corresponding CH via the bus 23.

FIG. 31 shows an outline of the configuration of the above-mentioned bearer signal. As described above, the bearer signal is transmitted in a form in which data of 6 bits in b _{1 to} b ₆ called an envelope format are wrapped around the F bit as a synchronization bit and the S bit as a control bit before and after the data. Is done.

[0019] 3.2k units TSW in the data signal TSW22 according allocation setting indicated by the control signal 27 ₄ from the control unit 26 performs switching to 3.2kbps unit, a bearer signal 40 ₁ to 40 _M 6
The signal is converted into a 4 kbps zero-order group signal 43. Alternatively, conversely, the 0th-order group signal 44 of 64 kbps is divided for each CH and converted into bearer signals 41 _{1 to} 41 _M. This 0
Subgroup signals are from the International Telecommunication Union-Telecommun
X.ication Standardization Sector (ITU-T) recommendation. It conforms to 50 multi-frames.

FIG. It shows the outline of the configuration of a frame transmitted in 50 multiframes. X. A frame transmitted by 50 multiframes includes ₆ TSs of D _{1 to} D ₆ and TSs in which F bits are inserted.
And a TS into which the S bit is inserted. The bit number to be inserted into the F bit and the data of the CH to be inserted into each TS of D _{1 to} D ₆ are determined in advance by the TTC standard JJ-20-31 as the CH number to be inserted into the frame number in advance. I have. X. The 50 multi-frame forms a multi-frame in which a transmission signal of 64 kbps per frame is multi-structured.

The audio signal TSW21 and the data signal TS
W22 multiplexed audio signal, ST multiframe 38, X.W22. 0th order signal 4 of 50 multiframes
3 is a bus 24 as a transmission signal of 64 kbps.
Is supplied to the 64k unit TSW20 via the multiplexing unit and multiplexed. On the other hand, the 64 kbps audio signal 37 divided by the 64 k unit TSW 20 and the ST multiframe 3
9, X. The 50th multi-frame zero-order group signal 44 is transmitted via the bus 24 to the 8 k
Unit TSW and 0.4k unit TSW and data signal TS
W22.

The 64-k unit TSW 20 performs switching in units of 64 kbps in accordance with the allocation setting indicated by the control signal 27 ₁ from the control unit 26, and is previously assigned to each of the transmission line IF modules 17 ₁ , 18 ₁ ,. 24T of transmission frames on bus 25
The bus signals 45 ₁ ... And the bus signals 46 ₁ ... As switching data are transmitted to S or 96TS. 2
The 4TS bus signals 45 ₁ are taken into the transmission line IF modules 17 ₁ , converted into high-speed transmission signals of a predetermined frame format in the 1.544 Mbps transmission lines 13 _1, and transmitted. The bus signals 46 ₁ consisting of 96TS are taken into the transmission line IF modules 18 ₁ , converted into high-speed transmission signals of a predetermined frame format in the 6.312 Mbps transmission lines 14 _1, and transmitted.

On the other hand, 1.544 Mbps transmission lines 13 ₁ .
High-speed transmission signal is to be format-converted transmission line IF module 17 ₁ ... In, assigned in advance the transmission line IF module 17 ₁ ... each TS, 24
A 64 kbps bus signal 47 ₁ ...
5 and supplied to the TSW 20 in 64 k units. Also,
The high-speed transmission signal on the 6.312 Mbps transmission lines 14 ₁ .
The format is converted by the transmission line IF modules 18 ₁ ..., And the TS assigned to each of the transmission line IF modules 17 ₁ .
bps bus signals 48 ₁ ... of sending to the bus 25, 64k
Supply to the unit TSW20.

FIG. 33 shows an outline of the configuration of a bus signal multiplexed by the TSW 20 in 64k units (actually, parallel conversion is performed in units of 8 bits).
In this manner, the bus signal is switched every 64 kbps, and one of the time slots of the transmission signal transmitted on the bus 25 has a 64 kbps audio signal 49 multiplexed by the 8 k unit TSW of the audio signal TSW 21. , An ST multiframe 50 multiplexed by the 0.4 k unit TSW of the audio signal TSW21, and the data signal T
X.22 multiplexed by 3.2k unit TSW of SW22. A universal signal 51 of 50 multiframes is allocated.

As described above, when transmitting a low-speed transmission signal to a high-speed transmission line, the TDM transmits a transmission signal of 64 kbps or less in an 8 k unit TSW, a 0.4 k unit TSW, and 3.
After multiplexing to 64 kbps by 2k unit TSW, 6
By further multiplexing and transmitting a high-speed signal in 4k-unit TSW, a low-speed transmission signal can be freely allocated to a high-speed transmission path.

Such a technique relating to TDM is disclosed, for example, in Japanese Patent Application Laid-Open No. Hei 10-322296, entitled "Multiplexing method for MTDM apparatus". This Japanese Patent Application Laid-Open No. 10-3222
In the TDM to which the technology disclosed in Japanese Patent Application Publication No. 96 is applied, for example, a low-speed transmission signal of 0.8 kbps is grouped and multiplexed collectively by a 64 k-unit TSW so that the delay time of the low-speed transmission signal in the device is reduced. Can be reduced.

[0027]

However, in the TDM shown in FIG. 27 or the conventional TDM to which the technique disclosed in Japanese Patent Application Laid-Open No. Hei 10-322296 is applied, transmission signals having different low transmission rates are handled. In addition to 64k unit TSW, 0.8k unit TSW, 3.2k unit T
SW and 8k unit TSW. Therefore,
There is a problem that the circuit scale of the TSW part in the TDM becomes very large. In addition, large TS
When W is provided, the complexity of the assignment setting by the control unit also increases, which causes an increase in the size and complexity of the device.
Simplification of the SW part has been desired.

It is an object of the present invention to provide a TDM which simplifies the TSW portion, reduces the size of the device, and performs division multiplexing of transmission signals of various transmission speeds.

[0029]

According to the first aspect of the present invention, (a) a first transmission signal having a first transmission rate is multiplexed for each first number of channels, and the first transmission signal is multiplexed at a rate higher than the first transmission rate. Multiplexing means for generating a second transmission signal having a high second transmission rate; and a third transmission signal having a third transmission rate transmitted and received corresponding to the first transmission signal. A first multi-frame forming means for forming a multi-frame for each number of channels, and a second transmission signal generated by the multiplexing means and each frame multi-framed by the first multi-frame forming means are converted in parallel. Low-speed transmission line interface means comprising parallel conversion means,
(B) time switch means for switching the parallel data converted by the parallel conversion means to a second transmission rate unit; and (c) a second transmission signal and a multi-frame from the parallel data switched by the time switch means. Separating means for separating each of the divided frames from each other, and converting the data of each frame separated by the separating means into a third transmission rate, and then multi-frames for each second number of channels greater than the first number of channels. Second multi-frame generating means for multiplexing, and the second transmission signal separated by the separating means and the multi-frame data multi-framed by the second multi-frame forming means are multiplexed and inserted into a predetermined time slot. Time-division multiplexing apparatus with high-speed transmission line interface means having time slot inserting means To be provided.

That is, according to the first aspect of the present invention, the low-speed transmission line interface means sets the number of
A first transmission signal having a first transmission rate is multiplexed into a second transmission signal having a higher speed than the first transmission rate, and a third transmission signal transmitted / received corresponding to the first transmission signal is multiplexed. Is converted into parallel data by the parallel conversion means and supplied to the time switch means. Then, the data switched by the time switch means is input to the high-speed transmission path interface means.
The high-speed transmission path interface unit temporarily separates the second transmission speed from the data of each frame of the multi-frame data. The data of each of the separated frames is converted into a third transmission rate by the second multi-frame forming means, and then converted into multi-frames for each second channel number larger than the first channel number, and separated by the separating means. The second
Multiplexed with the transmission signal of the above-mentioned transmission signal and inserted into a predetermined time slot of the transmission line frame of the high-speed transmission line.

According to the second aspect of the present invention, (a) speed conversion means for converting transmission signals having different transmission speeds into the number of channels corresponding to the transmission speeds so as to have a higher first transmission speed; (B) first time switch means for multiplexing the speed conversion signals converted by the speed conversion means in units of a predetermined number of channels within the number of channels converted by the speed conversion means for each transmission signal; (C) multi-frame conversion means for converting the switching data switched by the time switch means for each transmission signal into multi-frames at a first transmission rate per frame; and (d) multi-frame conversion by the multi-frame conversion means. Second time switch means for switching frame data in a first transmission rate unit; The switching data is switched in the second time switching means multiplexes is provided in division multiplexer at a time slot insertion means for inserting a predetermined time slot.

That is, according to the second aspect of the present invention, the transmission signals having different transmission rates are converted into the number of channels corresponding to the respective transmission rates so that the transmission signals having different transmission rates become the first transmission rate by the speed conversion means. One time switch means multiplexes the speed-converted signals converted by the speed conversion means in units of a predetermined number of channels within the number of channels converted by the speed conversion means for each transmission signal. Then, this is multi-framed at a first transmission rate per frame by the multi-frame conversion means, and switching is performed again by the second time switch means in units of the first transmission rate. The switched data is multiplexed and inserted into a predetermined time slot of a transmission line frame on the high-speed transmission line.

According to the third aspect of the present invention, (a) a multi-frame is formed for each of the first transmission signal having the first transmission rate and the first number of channels from the transmission signal inserted in the predetermined time slot. Extracting means for extracting multi-frame data, and converting the multi-frame data extracted by the extracting means into a second transmission signal having a second transmission rate lower than the first transmission rate, and then converting the first channel to a first channel. A multi-frame forming means for forming a multi-frame for every second channel number less than the number, and converting the first transmission signal extracted by the extracting means and each frame multi-framed by the multi-frame forming means into parallel data High-speed transmission line interface means having parallel conversion means for converting the parallel data; (C) separating a first transmission signal and each frame multi-framed by the multi-frame forming unit from the switching data switched by the time switching unit; Separating the first transmission signal separated by the separating means into a third transmission speed lower than the first transmission speed for each second number of channels.
Dividing means for dividing into a third transmission signal having a transmission speed of, and dividing each frame data divided into multi-frames by the separating means into a second transmission signal for every second number of channels.
And a low-speed transmission line interface unit including a multi-frame conversion unit that converts the transmission signal into a second transmission signal having a second transmission speed that is transmitted and received in response to the transmission signal.

That is, according to the third aspect of the invention, when the transmission signal extracted from the transmission line frame on the high-speed transmission line is divided into low-speed transmission lines, the transmission signal is multiplexed from the low-speed transmission line to the transmission line frame on the high-speed transmission line. The procedure is performed in the reverse order of the first aspect of the invention.

According to a fourth aspect of the present invention, (a) extracting means for extracting multi-frame data having a first transmission rate from a transmission signal inserted in a predetermined time slot, and (b) extracting means First switching means for switching the extracted multi-framed data for each predetermined time slot in a first transmission rate unit; and (c) from the multi-framed data switched by the first switching means. Dividing means for extracting data of a predetermined number of channels for each frame and dividing the data into transmission signals of a first transmission rate; (d) for each of the divided data divided by the dividing means Second time switch means for dividing the signal into divided transmission signals corresponding to the number of channels, and (e) the second time switch Stage by is provided in division multiplexer at a rate converting means for converting the transmission speed slower than the first transmission rate corresponding respectively from the divided transmission signals of the number of channels that are switched.

That is, according to the fourth aspect of the invention, when the transmission signal extracted from the transmission line frame on the high-speed transmission line is divided into low-speed transmission lines, the transmission signal is multiplexed from the low-speed transmission line to the transmission line frame on the high-speed transmission line. The procedure is performed in the reverse order of the second aspect of the invention.

According to a fifth aspect of the present invention, in the time-division multiplexing apparatus according to the first aspect, the first transmission signal is a high-efficiency coded voice signal, and the third transmission signal is a signaling signal. It is characterized by:

According to a sixth aspect of the present invention, in the time-division multiplexing apparatus according to the third aspect, the third transmission signal is a high-efficiency coded voice signal, and the second transmission signal is a signaling signal. It is characterized by:

That is, according to the fifth or sixth aspect of the present invention, as the transmission signal of the low-speed transmission line, the high-efficiency encoded voice signal and the signaling signal of the individual signal system with the exchange are transmitted in the device. Even in a TDM that is generally divided and multiplexed at 64 kbps by converting to the first or third transmission speed, division multiplexing with a high-speed transmission line can be performed only by a 64k unit time switch. Can be.

[0040]

BEST MODE FOR CARRYING OUT THE INVENTION

[0041]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to embodiments.

First Embodiment

FIG. 1 is a timing chart showing the operation of T according to the first embodiment of the present invention.
This shows an outline of a DM configuration. The TDM in the first embodiment is based on the
60 ₁ ... low-speed side IF module having the F function, the transmission line IF module 61 ₁ each having a IF function between the high-speed transmission path for example 1.544Mbps transmission path and 6.312Mbps transmission path ..., 62 ₁ ... a And a TSW unit 63 for switching between the transmission signal on the low-speed transmission path and the transmission signal on the high-speed transmission path. The low-speed transmission line to which the low-speed side IF modules 60 ₁ are connected is an individual line having a signal line for each line between an audio line for transmitting an analog audio signal and an exchange corresponding to each audio line. SS used for the SR method, which is the signaling method
Line / SR line, transmission speed 2.4 kbps, 4.8 kb
ps, 9.6 kbps, 14.4 kbps, 19.2 k
There is a data communication line through which a bps synchronous data signal is transmitted.

The feature of the TDM in the first embodiment is that the TSW section is constituted only by TSW of 64 k units and division multiplexing is performed between a transmission signal of 64 kbps or less and a high-speed transmission signal. There is a point that can be. For this reason, a transmission path IF module as a high-speed IF module of a type corresponding to the type of the low-speed transmission path to which the low-speed IF module is connected is connected to the TSW unit 63, and a transmission signal of 64 kbps or less is transmitted at a low speed. By converting to 64 kbps by the side IF module, TS in 64k units
Division multiplexing can be performed only with W.

The low-speed transmission line connected to the low-speed side IF modules 60 ₁ ... May be only a voice line or a data communication line, or may be a combination thereof. In any case, for each low-speed transmission line to be accommodated, the corresponding low-speed side IF module and transmission line IF module are connected to the TSW unit 63, and the above-described division multiplexing is performed. Hereinafter, a case where only a voice line is connected as a low-speed transmission line and a case where only a data communication line is connected will be sequentially described.

FIG. 2 shows an outline of the configuration of a TDM in the first embodiment for performing division multiplexing between a voice signal on a voice line as a low-speed transmission line and a high-speed transmission signal on a high-speed transmission line. is there. In this case, T in the first embodiment is used.
The DM has a 2N-channel audio line 65 on the low-speed transmission line side.
_{1 to} 65 _2N and SS lines / SR lines 66 _{1 to} 66 _2N corresponding to respective voice lines are connected, and 1.54 to the high-speed transmission line side.
The 4 Mbps transmission lines 67 ₁ are connected to the 6.312 Mbps transmission lines 68 ₁ . In this TDM, ADPCMIF modules 69 _{1 to} 69 _N having an IF function of a voice line in units of 2 CHs and 1.5
44Mbps transmission path and 6.312Mbps transmission path transmission line IF module 70 each having an IF function between ₁ ... has a 71 ₁ ... and.

Further, this TDM is composed of only a 64 k unit TSW memory for switching at 64 kbps unit, and a TSW unit 72 functioning as a 64 k unit TSW.
It has. Each IF module 69 _{1 to} 69 _N on low speed side
And the TSW unit 72 are connected via a bus 73. TSW unit 72 and high-speed IF module 70
₁ ..., 71 ₁ ..., and it is connected via a bus 74.

Further, this TDM has a control unit 75, and a 64 kbps in the TSW unit 72 is controlled by a control signal.
Assignment setting can be made in s units.

ADPCMIF module 69₁~ 69
_NAre the ADPCM encoders 76 ₁~ 76_NAnd each
SR which is an individual line signaling system provided for a voice line
Sampling corresponding to SS line / SR line used in the system
Part 77₁~ 77_NAnd

The ADPCM encoding units 76 _{1 to} 76 _N encode the analog audio signals on each audio line by ADPCM and multiplex the analog audio signals on each of the two lines to be connected at 64 kbps.
Generating a speech signal 78 ₁ to 78 _N. This audio signal 78
_{1 to} 78 _N are transmitted through the bus 73 to the T
The data is multiplexed by the SW unit 72. Conversely, the audio signals 79 _{1 to} 79 _N divided by the TSW unit 72 in units of 64 kbps
Is an ADPC that accommodates the corresponding CH via the bus 73
The signals are input to the M encoders 76 _{1 to} 76 _N.

FIG. 3 shows the audio signals 78 ₁ , 7 shown in FIG.
Shows the outline of 9 ₁ configuration. That is, 1
32 kbps of analog audio signal per channel at 32 kbps
6 composed of “32 k ADPCM audio signal × 2CH” obtained by multiplexing DPCM encoded audio signals b _{1 to} b ₄ by 2 channels
It is configured as a 4 kbps transmission signal.

The sampling units 77 _{1 to} 77 _N sample each SS line / SR line and generate ST multi-frames 80 ₁ to 80 _{N in} which _one TS multiplexed for every two lines connected is 8 kbps. The ST multiframe 80 ₁ to 80 _N via the bus 73, 64k units TSW
Are multiplexed by the TSW unit 72. Conversely, the TSW unit 7
The ST multiframes 81 _{1 to} 81 _N divided into 64 kbps units by 2 are input via buses 73 to sampling units 77 _{1 to} 77 _N that accommodate the corresponding CHs.

FIG. 4 shows an outline of the configuration of _one TS of the ST multiframes 80 ₁ and 81 ₁ shown in FIG. FIG. 1A shows an outline of the configuration of one TS of an ST multiframe. FIG. 2B shows an example of the assignment of 1TS. That is, one TS of the ST multiframe is 8
Each TS is transmitted at a cycle of 1 ms. Each TS has a multi-frame configuration including a total of 8 bits including an F bit indicating a head of a frame, an SP bit serving as a warning bit, and 6 bits including CH1 and CH2 signaling signals.

[0054] TSW unit 72 in accordance with the allocation setting indicated by the control signal from the control unit 75, the audio signal 78 of such "32 kbps × 2CH" shown in FIG. 3 ₁
７８78 _N is switched in units of 64 kbps. A TS is assigned to the bus signal on the bus 74 in advance for each transmission line IF module, and audio signals 78 _{1 to} 78 _N are transmitted to each TS in units of 64 kbps by a control signal from the control unit 75. The multiplexed signal 82 multiplexed in this manner is “32 k ADPCM audio signal × 2”.
The CH × N ". Multiplexed signal 82 is pre-assigned TS group are supplied to the transmission line IF module. For example the transmission path IF module 70 ₁ ..., 71 ₁ ..., the respective multiplexed signals 82 "32k ADPCM"
Multiplexed signal 83 ₁ ... Of audio signal × 2CH × 23TS ”
84 ₁ ... Are inputted.

On the other hand, the transmission line IF modules 70 ₁ .
From 1 ₁ …, “32k ADPCM audio signal × 2CH ×
Multiplexed signal 85 ₁ ... of 23TS ", 86 ₁ ... it is sent to the bus 74 at the pre-assigned timing, respectively. Each transmission path IF module 70 ₁ ..., sent at different timings from 71 ₁ ... multiplexing Signal 85 ₁
, 86 ₁ … are “32k ADPCM audio signal × 2CH”
Division as a multiplexed signal 87 of × N ", .tsw unit 72 to be input to the TSW unit 72 in accordance with the allocation setting indicated by the control signal from the control unit 75, it to the audio signal 79 ₁ to 79 _N Become

Further, the TSW unit 72 sets 1 according to the allocation setting indicated by the control signal from the control unit 75.
The ST multiframe (2) in which the TS is the TS shown in FIG.
CH) 80 ₁ to 80 _N are switched. The bus signals on the bus 74 are assigned to the TS multiframes 80 ₁ to 80 _{N in} units of 8 kbps by the control signal from the control unit 75 to the TS assigned in advance for each transmission line IF module.
Is sent. Multiplexed ST multiplexed in this way
The multi-frame (2CH) 88 is “ST frame ×
N ". Each TS of the multiplexed ST multiframe 88
, A group of TS assigned in advance is supplied to the transmission line IF module. For example, the transmission path IF module 70
₁ ..., 71 ₁ ... are multiplexed ST multiframe 89 of "ST multiframe × 23TS" of each multiplexed ST multiframe 88 ₁ ..., so that the 90 ₁ ... are inputted.

On the other hand, the transmission line IF modules 70 ₁ .
1 ₁ ... from the multiplexed ST multiframe 91 ₁ ..., 92
₁ ... it is sent to the bus 74 at the timing allocated in advance, respectively. Each transmission line IF module 70
₁ ..., multiplexed sent at different timings from 71 ₁ ... ST multiframe 91 ₁ ..., 92 ₁ ... is, "ST
Multiplexed ST multiframe 93 of multiframe × N ″
Is input to the TSW unit 72. The TSW unit 72
According to the allocation setting indicated by the control signal from the control unit 75, the ST multiframes 81 _{1 to} 81 _N
Divided into

[0058] In the transmission line IF module 70 _1, bus 7
Multiplexed signal 83 ₁ ... and multiplexing is switched TSW unit 72 via a 4 ST multiframe 89 ₁ ... further multiplexes and inserts the TS on the transmission line frame in 1.544Mbps transmission line 67 _1. Or do the opposite.

[0059] Similarly, the transmission line IF module _711, and further multiplexing the multiplexed signal 84 ₁ and the multiplexing ST multiframe 90 ₁ which is switched in TSW unit 72 via the bus 74, 6.312Mbps transmission path 68 ₁ is inserted into the TS on the transmission path frame. Or do the opposite.

FIG. 5 shows the 1.544 Mbps shown in FIG.
It illustrates an example of a configuration of a transmission line frame in the transmission line 67 _1. FIG. 1A shows the configuration of the entire transmission path frame. FIG. 4B shows TS2 of the transmission line frame.
Only part 4 is shown in detail. Thus, 1.544M
The transmission line frame in the bps transmission line 67 ₁ is composed of one F bit indicating the head of the frame,
bps TS1 to TS24. Among them, TS1 to TS23 are “32 k ADPCM audio signal × 2CH × 23TS”, and TS24 corresponds to an ST multiframe. In the TS 24, each TS is transmitted at a period of 1 ms as shown in FIG. Each TS has a multi-frame configuration including a total of 8 bits including an F bit indicating the head of the frame, an SP bit serving as an alarm bit, and a 6-bit signaling signal of 6 CHs sequentially allocated from CH1.

[0061] Hereinafter, the audio signal input from ADPCMIF module described above are multiplexed will be described in detail for the case of insertion from the transmission line IF module 70 ₁ to the TS of the transmission line frame of 1.544Mbps transmission line 67 _1.

FIG. 6 shows the TDM I in the first embodiment.
It shows the main components of the F module. However, the same parts as those of the TDM shown in FIG. Here, for convenience of explanation, the direction from the low-speed side or high-speed side to the TSW unit is the up direction, and the direction from the TSW unit to the high-speed side or the low-speed side is the down direction, and the buses 73 and 74 shown in FIG. It is assumed that signals are transmitted between each IF module and the TSW unit 72 via the upstream bus and the downstream bus. In other words, in this TDM, the ADPCMIF modules 69 _{1 to} 69 _N accommodating the audio line and the corresponding SS line / SR line in units of 2CH transmit the uplink transmission signal to the TSW unit 72 via the uplink bus 100. It transmits and receives downlink transmission signals from the TSW unit 72 via the downlink bus 101. ADPCMIF module 69 ₁ to 69 _N is, since the same configuration, respectively, in the following for ADPCMIF modules alone will be described ADPCMIF module 69 _1.

[0063] ADPCMIF module 69 _1, SS line using voice lines 65 _1, 65 ₂ of the analog audio signal as well as ADPCM encoding, the SR method is associated signaling provided corresponding to each voice line / SR line is sampled, and the TSW
It is sent to the unit 72. Or vice versa. For this reason, the ADPCMIF module 69 ₁ includes the ADPCM codec section 102 ₁ and the 32k / 64k conversion section 103.
₁ , a bus IF unit 104 ₁ , an ST frame generation / termination unit 105 _1, and a 1k sampling unit 106 ₁ .

[0064] ADPCM codec 102 _1, the analog audio signal of the voice lines 65 _1, 65 _2, T for each CH
TC Standard G. Efficient coding (ADPC
M) 32 kbps (4-bit unit) 32 kAD
It is converted into PCM audio signals 107 ₁ and 107 ₂ . Or 3
The opposite is performed for the 2k ADPCM audio signals 108 ₁ and 108 ₂ .

The 32k / 64k conversion section 103 ₁ uses the ADP
ADPC for each CH by CM codec section 102 ₁
M-coded 32 k ADPCM audio signal 107 ₁ , 1
07 ₂ 2CHs are multiplexed to 64 kbps 64k
Audio signal (32 k ADPCM audio signal x 2 CH) 109
Convert to ₁ . Or 64k audio signals from the bus IF unit 104 ₁ (32KADPCM audio signal × 2CH) 110 ₁
And vice versa.

The 1k sampling section 106 ₁ is provided for each voice line, and is a signaling signal 111 ₁ , 111 ₂ obtained by sampling the SS line / SR line used for the SR system among the individual line signal systems of the exchange at ₁ kbps for each CH. Generate Alternatively, the reverse is performed on the signaling signals 112 ₁ and 112 ₂ from the ST frame generation / termination unit 105 ₁ .

[0067] ST frame generation and termination unit 105 _1, 1
The k signals of the ₂ signaling signals 111 ₁ and 111 ₂ generated by the k sampling unit 106 ₁ for each CH are converted into 8
Wraps to generate a multi-ST frame 113 _1. Or, 8 multi ST frame 1 from the bus IF unit 104 ₁
14 Terminating ₁ and signaling signal 11 for 2CH
Take out 2 ₁ and 112 ₂ .

Bus IF section 104₁Is 32k / 64k
Replacement unit 103₁32k ADCPM audio converted by
8-bit 64k audio signal in which the signal is multiplexed into 2 channels
109 ₁And the ST frame generation / termination unit 105₁By
The generated signaling signal is a multi-frame for 2CH
1-bit 8-multi ST frame 113₁When
Is converted into a 9-bit parallel signal, and the upstream bus 100
Is output to the specified TS. Or down bus 101
Captures a 9-bit parallel signal from the specified TS
32k ADPCM audio signal is multiplexed for 2CH
64k audio signal 110₁And the signaling signal is 2CH
8 multi-ST frames 114 divided into minute multi-frames
₁And convert to

The TSW section 72 is a 64 k unit TSW as described above,
A 9-bit parallel signal is fetched from the TS assigned to the MIF module 69 ₁ ,
Transmitted from the control unit not shown in among Figure 6 the TS allocated to the transmission line IF module 70 ₁ instructed by the control signal. Or TSW 72, vice versa takes in TS 9-bit parallel signals from allocated to the transmission line IF module 70 ₁ of the upstream bus 100, from the control unit to which a not illustrated in out 6 of the downstream bus 101 ADPCMIF indicated by control signal
Send to the TS assigned to each module.

[0070] transmission line IF module 70 _1, ADPC
The 9-bit parallel signal transmitted from each of the MIF modules 69 _{1 to} 69 _N captures the signal switched by the TSW unit 72, multiplexes the signal, and transmits it to the 1.544 Mbps transmission line 67 ₁ as a high-speed transmission line signal. Or do the reverse. Therefore, the transmission path IF module 70 ₁ is provided with a bus IF unit 115 _1, a transmission line frame generation and termination unit 116 _1, ST-frame termination-generating unit 1
17 ₁ and an ST frame generation / termination unit 118 ₁ .

The bus IF unit 115 of the transmission line IF module
₁ is a “9-bit parallel signal × N (1.544 Mbps) that is switched by the TSW unit 72 from a TS assigned in advance among the TSs of the downlink bus 101.
In the case of the transmission line IF module of the transmission line, N is a natural number of a maximum of 23).
"And 64k audio signal 119 ₁ ～119 _N consisting of," ADPCM audio signal × 2CH separates 8 and multi ST-frame 120 ₁ to 120 _N comprises signaling signal × 2CH ". For example, 64k audio signal 119 ₁ and CH1 CH
2, 32k ADPCM audio signals, 64k audio signals 119 ₂ include CH3 and CH4 32k ADPCM audio signals, and 64k audio signals 119 _N include CH (2N-1) and CH (2N) 32k ADPCM audio signals. Similarly, for example, 8 multi-ST frames 120 ₁ are CH1 and C
H2 signaling signal, 8 multi-ST frame 120 ₂ includes CH3 and CH4 signaling signals,
8 multi-ST frames 120 _N are composed of CH (2N−1) and C
H (2N) signaling signal. On the contrary, the bus IF unit 115 ₁ of the transmission line IF module
64k audio signals 121 _{1 to} 121 _N composed of 2 k ADPCM audio signals × 2 CH ”and 8-multi ST frames 122 ₁ to 122 _N composed of“ signaling signals × 2 CH ”, respectively.
22 _N and converts it into an uplink bus signal of “9-bit parallel signal × N” and sends it to the designated TS of the uplink bus 100.

Here, the multi-framed signal
Bus IF unit 1 to convert the
Fifteen₁Multi-ST frame 120 output from₁~ 1
20 _NIs the ST frame end / generation unit 117₁And ST
Frame generation / termination unit 118₁And through the transmission line frame raw
Termination and termination unit 116₁Is input to

ST frame end / generation section 117₁Is
SWIF 115₁8 multi-ST frames 120 from₁~
120_NAre terminated, and 2
The signaling signals for CHs are extracted and
To CH (2N) extraction signaling signal 123₁~ 12
3_2NST frame generation / termination unit 118₁Send to
You. Or, conversely, ST frame termination / generation section 117
₁Is the ST frame generation / termination unit 118₁CH1 from
CH (2N) signaling signal 124₁~ 124 _2NTo
8 multi ST frames with 8 multi frames per 2 CH
Wrapped around the₁To send to.

The ST frame generation / termination unit 118 ₁
8 multi ST frames 125 ₁ to 125 obtained by converting the extracted signaling signals 123 _{1 to} 123 _2N of each CH from the T frame termination / generation section 117 ₁ into 8 multi frames for every 6 CH
25 _L (L is a natural number) to generate a transmission line frame
And it sends to the terminal portion 116 _1. Or ST frame generation
The termination unit 118 ₁ is a transmission line frame generation / termination unit 116 ₁
Signaling signals 124 _{1 to} 12 extracted for each channel from the 8 multi-ST frames 126 _{1 to} 126 _L
42N is sent to the ST frame end / generation unit 117 ₁ .

The transmission line frame generation / termination unit 116 ₁
64k audio signal 119 _{1 to} 119 composed of “32 k ADPCM audio signal × 2CH” from the bus IF unit 115 _1
N and 8 multi-ST frames 12 multi-framed for every 6 channels from ST frame generation / termination section 118 ₁
5 _{1 to} 125 _L and 1.544 Mbps of the 1.544 Mbps transmission path 67 _{1 based on} the ITU-T G.704.
It is inserted into the TS on the ps transmission line frame. Or conversely, from the TS on the transmission line frame of the 1.544 Mbps transmission line 67 ₁ , “32 k ADPCM audio signal × 2CH”
64k audio signals 121 _{1 to} 121 _N and 8 multi-ST frames 12 multi-framed every 6CH
Take out 6 _{1 to} 126 _L.

Next, with respect to the TDM having such a configuration,
The operation when the transmission signal on the low speed side is multiplexed as the transmission signal on the high speed side will be specifically described with reference to FIGS. When the transmission signal on the high-speed side is divided as the transmission signal on the low-speed side, the reverse operation is performed and the description is omitted.

FIG. 7 is a block diagram showing the ADCPM codec unit and 32k · 6 of the ADPCMIF module shown in FIG.
It shows the outline of the operation of the 4k conversion unit. FIG.
(A-1) shows the analog audio signal of voice lines 65 _1, 65 _2. FIG. 7A-2 shows the ADPCM shown in FIG.
7 shows ADPCM encoded data encoded by the codec section 102 ₁ . Figure 7 (b-1) shows an overview of 32kADPCM audio signals 107 ₁ configuration. FIG. 7 (b-2)
Shows an outline of the configuration of the 32 k ADPCM audio signal 107 ₂ . FIG. 7B-3 illustrates a case where the 32k / 64k conversion unit 103 is used.
₁ multiplexed by 64k audio signal (32k ADP
An outline of the configuration of the CM audio signal × 2CH) 109 ₁ will be described.

As described above, A of the ADPCMIF module
The DPCM codec section 102 ₁ converts the analog audio signal shown in FIG.
By sampling at a sampling frequency of z and quantizing the sampled value to 4 bits, a 32 kbps ADPCM audio encoding shown in FIG.
As a result, for each CH, the ADPCM codec section 102 ₁ converts the analog audio signal of the audio line 65 ₁ of CH 1 into a 32 k ADPCM audio signal 107 ₁ shown in FIG.
Is converted into an analog audio signal of the audio channel ₆₅₂ of the CH2 is 32kADPCM audio signal 10 shown in FIG. (B-2)
It is converted into 7 _2. The 32k / 64k conversion unit 103 ₁
PCM codec section 102 ₁ encodes 2CHs of 3
The 2k ADPCM audio signals 107 ₁ and 107 ₂ are multiplexed and, as shown in FIG.
Generating an audio signal 109 _1.

FIG. 8 shows an outline of the operation of the 1k sampling unit and the ST frame generation / termination unit of the ADPCMIF module shown in FIG. FIG.
(A-1) shows signals on the SS line / SR line corresponding to each audio line. FIG. 8A-2 shows a signaling signal sampled by the 1k sampling section 106 ₁ shown in FIG. Figure 8 (b-1) shows a signaling signal 111 ₁ shown in FIG. Figure 8 (b-2) shows a signaling signal 111 ₂ shown in FIG. FIG. 8 (b-3)
Shows an outline of the configuration of the 8-multi ST frame 113 ₁ generated by the ST frame generation / termination unit 105 ₁ . FIG. 7B-4 shows one TS of 8 multi-ST frames.
The outline of is shown.

As described above, one of the ADPCMIF modules
The k sampling unit 106 ₁ performs S sampling corresponding to each audio line.
By sampling the signal of the S line / SR line at 1 kHz, a signaling signal of 1 kbps shown in FIG. As a result, the 1k sampling unit 106
₁ is S for each CH corresponding to the audio line 65 _{1 of} CH1.
The signal on the S line / SR line 66 ₁ is 1k shown in FIG.
The signal is converted to a signaling signal 111 ₁ of ₁ bps and the signal of the SS line / SR line 66 ₂ corresponding to the voice line 65 _{2 of} CH ₂ is a signaling signal 1 of 1 kbps shown in FIG.
It converted to 11 _2. ST frame generation / termination unit 105
₁ indicates that the signaling signals 111 ₁ and 111 ₂ sampled for 2 channels by the 1k sampling section 106 ₁ are 1 ms
It is accommodated in a cycle of eight multi-ST frames 113 ₁ . Each TS of the 8-multi ST frame 113 ₁ is as shown in FIG.
As shown in the figure, the F bit transmitted at a 1 ms period, indicating the head of the frame, the SP bit which is a warning bit,
It is composed of a total of 8 bits including 6 bits including the H1 and CH2 signaling signals. The SP bit is used, for example, to indicate an alarm when the other party does not detect the F bit. Since only one bit of the signaling signal of each CH is transmitted during one cycle, the transmission speed of the signaling signal does not change at 1 kbps.

FIG. 9 shows an outline of the operation of the bus IF section of the ADPCMIF module shown in FIG. 9 (a) shows an outline of 64k audio signals 109 ₁ configuration. FIG. 13B shows an 8-multi ST frame 113.
An outline of the configuration of ₁ is shown. FIG. 3C shows an up bus 100.
An outline of the configuration of the above transmission signal is shown. Here, it is assumed that data is transmitted on the upstream bus 100 at, for example, 8.912 Mbps.

The bus IF section 104 ₁ has a “32 k ADPC
8 bits of a 64 kbps 64k audio signal 109 ₁ composed of “M audio signal × 2CH” and “signaling signal × 2CH”
8 kbps 8-multi ST frame 113 including “CH”
₁ bit is converted into a 9-bit parallel signal,
The data is transmitted to the designated TS on the upstream bus 100. When the upstream bus 100 is 8.912 Mbps, the number of TSs is 102
4 and the TS to be transmitted is assigned in advance by an instruction from a control unit (not shown). As a result, transmission signals from the ADPCMIF modules assigned to different TSs among the 1024 TSs shown in FIG. 9C are transmitted on the upstream bus 100 at 8.912 Mbps.
And is supplied to the TSW unit 72.

FIG. 10 shows an outline of the operation of the TSW unit 72. FIG. 1A shows an outline of a configuration of a bus signal transmitted on the upstream bus 100. FIG.
Shows an outline of the configuration of a bus signal transmitted on the downlink bus 101. Here, the up bus 100 and the down bus 1
01 is a transmission speed of 8.192 Mbps.

As shown in FIG.
The TS of the upper bus signal is composed of 1024 TS, and each TS is assigned to the ADPCMIF module or the transmission line IF module in advance. For example, TS _A 1
30 ₁ is connected to the ADPCMIF module 69 ₁ and TS _B 13
0 ₂ is stored in the ADPCMIF module 69 ₂ and TS _C 130 ₃
They are respectively assigned to ADPCMIF module 69 _N. The 9-bit parallel signal shown in FIG. 9C is transmitted to the upstream bus 100 from the ADPCMIF module assigned to each TS. The upstream bus 100 has a transmission line I for dividing a transmission signal from the high-speed side to the low-speed side from the TSW unit 72.
As TS for F module 70 ₁ is _{sent, TS D ~TS D + N 130} 4 corresponding to the N content of the TS is assigned.

On the other hand, as shown in FIG.
The TS of the bus signal on the bus 101 also comprises 1024 TS
Each TS is assigned in advance. Here, below
The allocation of the TS of the upstream bus 101 is based on the T
It is assumed that the same assignment as S is performed. Sand
Chi, TS_A131₁Is ADPCMIF module 69
₁And TS_B131_TwoIs ADPCMIF module 69
_TwoAnd TS_C131_ThreeIs ADPCMIF module 69
_NAnd TS_D~ TS_{D + N}131_FourIs the transmission path IF module 7
0 ₁, Respectively.

For example, according to a control signal from a control unit (not shown), TS _A , TS _B , and TS _B assigned to the ADPCMIF modules 69 ₁ , 69 ₂ , and 69 _N of the upstream bus 100
TS _C data, each TS _D of TS _D ~TS _D + N 131 ₄ assigned to the transmission line IF module 70 ₁ downlink bus 101, TS _D + N, are switched to the TS _{D + 1.} The transmission line IF module 7 of the upstream bus 100
0 ₁ assigned TS _D, data of _{TS D + 1, TS D +} N is, ADPCMIF module 6 of the downstream bus 101
TS _A , TS _C , T assigned to 9 ₁ , 69 _N , 69 ₂
It is switched to the S _B.

It is not necessary to allocate the same TS to the upstream bus 100 and the downstream bus 101, and the TSW unit 72 transfers an arbitrary TS on the upstream bus 100 to the downstream bus by a control signal from a control unit (not shown). Although data can be transferred between arbitrary TSs by allocating to an arbitrary bus on the 101, usually the same T
S is assigned.

The 9-bit parallel signal switched by the TSW unit 72 in this manner is converted into a pre-allocated transmission line IF module 70 on the downlink bus 101 according to a control signal from a control unit (not shown).
Inserted into _one corresponding TS.

FIG. 11 shows an outline of the operations of the bus IF unit, ST frame termination / generation unit, and ST frame generation / termination unit of the transmission line IF module shown in FIG. However, N is 23. FIG. 11 (a-1)
Shows an outline of the configuration of a bus signal transmitted on the downlink bus 101. Figure 11 (a-2) was isolated by the bus IF unit 115 ₁ "32KADPCM audio signal × 2CH
.Times.23 ". FIG. 11 (a-3)
“8 multi ST separated by the bus IF unit 115 ₁
11 (b-1) shows an example of allocation of each TS in an 8-multi ST frame. FIG. 11 (b-2) shows FIG. 6. shows an outline of a configuration of the extraction signaling signals 123 _{1 to 123 46.} FIG. 11 (c) shows an 8 outline of a configuration of a multi-ST-frame 125 _{1-125 8} shown in FIG.

[0090] bus IF unit 115 _1, of the downstream bus signals shown in FIG. 11, which is sent to the downstream bus 101 by TSW section 72 (a-1), are assigned to pre-transmission line IF module 70 ₁ TS for 23TS
140 9-bit parallel signals are extracted. As shown in FIGS. (A-2) and (a-3), each parallel signal has an 8-bit “32 k ADPCM audio signal × 2C”.
H "and 1-bit 8-multi ST frame.
Then, corresponding to the frame format of the 1.544 Mbps transmission path, a 64k audio signal 119 having ADPCM encoded data for 46 CH (= 2CH × 23TS).
_{1 to} 119 ₂₃ are generated, and 8 shown in FIG.
Multi ST frames 120 _{1 to} 120 ₂₃ are generated.

The ST frame terminating / generating unit 117 ₁ terminates the eight multi-ST frames output from the bus IF unit 115 ₁ shown in FIG. As shown in -1), 2
The signaling signal assigned to the CH is taken out and separated as a 1 kbps signaling signal. For example, the signaling signals S ₁ and S ₂ allocated to the _first TS of the 8 multi-ST frame 120 ₁ are shown in FIG.
As shown in -2), they are extracted as ₁ kbps signaling signals 123 ₁ and 123 ₂ , respectively.

Signaling signal 123 _{1 of} CH ₁ to CH 46 extracted by ST frame termination / generation section 117 ₁
～123 ₄₆ 8 multi-ST, which is 8 multi-framed every 6CH by ST frame generation and termination unit 118 ₁
Frame 125 _{1-125 8} is generated. For example, 8 multi ST-frame 125 ₁ is multi-framed signaling signal of CH1 to CH6, 8 multi ST-frame 125 ₈ multi framed signaling signal CH43～CH46. 8 ST ₁ ~ of multi-ST frame
ST ₈ is transmitted at a period of 1 ms as shown in FIG. 3C, and includes 6 bits including an F bit indicating the head of the frame, an SP bit serving as an alarm bit, and a signaling signal sequentially allocated every 6 CHs. And 8 bits in total.

[0093] Figure 12 is a diagram showing an outline of the operation of the transmission line frame generation and termination unit 116 ₁ of the transmission line IF module shown in FIG. FIG. 12A shows the 8-multi S generated by the ST frame generation / termination unit 118 ₁ .
4 shows an outline of the configuration of a T frame. FIG. 2B shows a signaling signal accommodated in an 8-multi ST frame.
FIG. 11C shows the 64k audio signals 119 _{1 to} 119 ₂₃ separated by the bus IF unit 115 ₁ . Figure (d)
Shows an outline of the configuration of the transmission line format of the 1.544 Mbps transmission line 67 ₁ .

As described above, the 8-multi ST frame 12 generated by the ST frame generation / termination unit 118 ₁
5 _{1-125 8,} ST ₁ to S as shown in FIG. 12 (b)
T ₈ is a multi-frame structure that is transmitted at 1ms period. As shown in FIG. 2A, signaling signals of each CH are allocated to TS1 to TS8 of each ST, respectively. ST ₁ -ST of such an 8 multi-ST frame
ST ₈ is converted into a 64k audio signal 119 ₁ to ₁ consisting of 23 TSs.
To accommodate as 24TS eyes against 19 _23. And
1.544Mbps Transmission line 67 T of transmission line frame ₁
Housed in S1～24, is sent to the 1.544Mbps transmission line 67 ₁ by adding a frame bit F for use in channel top.

[0095] The voice signal of the low-speed voice line and the signaling signal of the SS line / SR line provided corresponding to the voice line are transmitted at a high speed over a 1.544 Mbps transmission line conforming to ITU-T G.704. Although the TDM to be transmitted on the transmission line has been described, the transmission line is not limited to the high-speed transmission line. 6.312Mbp high-speed transmission line
Even in the case of the s transmission path, only the number of TSs to be allocated is different, and 6.31 having the same configuration as the configuration shown in FIG.
With the transmission line IF module for the 2 Mbps transmission line, it is possible to accommodate the transmission line format of the 6.312 Mbps transmission line, for example, which is also based on the TTC standard.

FIG. 13 shows that the high-speed transmission path is 6.312 Mbp.
7 is a diagram showing an outline of operations of a bus IF unit, an ST frame termination / generation unit, and an ST frame generation / termination unit of the transmission line IF module shown in FIG. 6 when the transmission line is an s transmission line. However, N is 92. Therefore, 92TS is allocated to the upstream bus 100 and the downstream bus 101 for the transmission line IF module of the 6.312 Mbps transmission line. FIG. 13A-1 shows an outline of a configuration of a bus signal transmitted on the downlink bus 101. FIG. 13 (a-2)
Is the “32k ADPCM separated by the bus IF unit.
1 shows a downlink bus signal of an audio signal × 2CH × 92 ″.
3 (a-3) indicates a downlink bus signal of “8 multi ST frames (2CH) × 92” separated by the bus IF unit. FIG. 13 (b-1) shows an example of allocation of each TS of an 8-multi ST frame. FIG.13 (b-2) shows the outline | summary of a structure of the extraction signaling signal shown in FIG. FIG. 13C shows an outline of the configuration of the 8-multi ST frame shown in FIG.

The bus IF unit is previously allocated to the transmission line IF module corresponding to the 6.312 Mbps transmission line out of the downlink bus signals shown in FIG. A 9-bit parallel signal of TS150 corresponding to 92TS is extracted. In this parallel signal, each TS is shown in FIG.
2), as shown in (a-3), an 8-bit "32 kAD
PCM audio signal × 2CH ”and 1-bit 8 multi-ST frames. In correspondence with the frame format of the 6.312 Mbps transmission line, 184CH (=
64k audio signal 151 _{1-151 92} with ADPCM encoded data 2CH × 92TS) content is generated, and 8 multi ST frame shown in FIG. (A-3) is generated.

The ST frame terminating / generating section terminates the 8 multi-ST frames output from the bus IF section shown in FIG.
As shown in FIG. 3 (b-1), a signaling signal divided into two channels for each TS is extracted and separated as a ₁ kbps signaling signal, and extracted as ₁ kbps signaling signals 152 _{1 to} 152 ₁₈₄ , respectively.

Signaling signals 152 ₁ to 152 of CH ₁ to CH 184 taken out by ST frame termination / generation section
2 ₁₈₄ 8 multi ST frames 8 multiframe of each 6CH by ST frame generation and termination unit is generated. ST ₁ to ST ₃₂ of the 8 multi-ST frame are as follows:
As shown in FIG. 3C, a total of 6 bits including the F bit indicating the head of the frame, the SP bit serving as a warning bit, and the signaling signal sequentially allocated for every 6 CHs are transmitted in a 1 ms cycle. It consists of 8 bits.

FIG. 14 shows that the high-speed transmission path is 6.312 Mbp.
7 is a diagram showing an outline of an operation of a transmission line frame generation / termination unit of the transmission line IF module shown in FIG. 6 when the transmission line is an s transmission line. FIG. 14A shows the outline of the configuration of an 8-multi ST frame generated by the ST frame generation / termination unit. FIG. 2B shows a signaling signal accommodated in an 8-multi ST frame. FIG. 9C shows the 64k audio signals 151 ₁ to 151 ₁ separated by the bus IF unit.
₅₁₉₂ is shown. FIG. 3D shows an outline of the configuration of the transmission line format of the 6.312 Mbps transmission line.

The 8-multi ST frame generated by the ST frame generation / termination unit as described above
As shown in (b), a multi-frame configuration in which ST ₁ to ST ₃₂ are transmitted at a period of 1 ms. TS1 to T of each ST
In S8, as shown in FIG. 7A, a signaling signal of each CH is allocated. 8 like this
The ST ₁ to ST ₃₂ of the multi ST frame are added to the 64k audio signals 151 _{1 to} 151 ₉₂ composed of ₉₂ TSs by adding T
Housed as S. Then, it is accommodated in TS1 to TS96 of the 6.312 Mbps transmission line, and transmitted to the 6.312 Mbps transmission line with a transmission line frame bit F added to the head.

As described above, in the TDM in the first embodiment, the audio signal and the signaling signal of the SS line / SR line corresponding to the audio line and the signaling signal are multiplexed by the ADPCMIF module for every 2CH and converted into a transmission signal of 64 kbps. After that, switching is performed in 64k unit TSW, and the signal is transmitted to a high-speed transmission path of, for example, 1.544 Mbps or 6.312 Mbps.
Can be constituted only by the 64k unit TSW memory,
The assignment setting by the control unit can be simplified.

Second Embodiment

In the second embodiment, 2.
13. 4 kbps, 4.8 kbps, 9.6 kbps,
Division multiplexing is performed between a synchronization signal having a bearer speed of 4 kbps and 19.2 kbps and a high-speed transmission signal on a 1.544 Mbps transmission line.

FIG. 15 shows an outline of the configuration of the TDM in the second embodiment. This TDM has a transmission rate of 2.4 kbps and a transmission rate of 4.
8 kbps, 9.6 kbps, 14.4 kbps, 1
Synchronous data communication line 161 _{1-161 5} sync signal is transmitted in the 9.2kbps is connected, 1.544Mbps transmission line 162 ₁ ... is connected to the high-speed transmission line side. In this TDM, a bearer speed converter 163 having an IF function of a synchronous data communication line is used as an IF module.
₁ to 163 _5, a transmission line IF module 164 ₁ which has a IF function between 1.544Mbps transmission line 162 ₁ ...
….

Further, the TDM has a TSW section 165.
And 64k unit TSW, 64k unit TSW memo
It is composed only of files. Therefore, bearer speed conversion
Part 163₁~ 163_Five64kbps universal signal
And convert it to 64 kbps in 64k TSW once
By switching to units, universal
Repeated data according to bearer speed during signal conversion
The number of universal signals of CH equal to the number is put together. So
Then, X.D. Change to 50 multi frames
After the conversion, the TSW unit 165 again uses the 64k unit TSW.
1.544 Mbps transmission by multiplexing
It is inserted into any TS in the transmission line frame on the road. But
Therefore, the TDM in the second embodiment is a bearer rate conversion.
Part 163 ₁~ 163_FiveFor each, the zero-order group converter
166₁~ 166_FiveIt has.

The bearer speed converters 163 _{1 to} 163 ₅ , which are IF modules on the lower speed side, and the TSW unit 165 are connected via a bus 167. TSW unit 165 and 0
Subgroup conversion units 166 _{1 to} 166 ₅ and high-speed transmission line IF
The modules 70 ₁ ... Are connected via a bus 168. Further, the zero-order group conversion units 166 _{1 to} 166 ₅ are also connected to a bus 167. Furthermore, this TDM
Has a control unit 169, and the TSW unit 1
It is possible to set the allocation in units of 64 kbps in 65.

The bearer rate converters 163 _{1 to} 163 ₅ have transmission rates of 2.4 kbps, 4.8 kbps,
9.6 kbps, 14.4 kbps, 19.2 kbps
3.2 kbps, 6.4 kbps, and 12.
8 kbps, 19.2 kbps, after converting the bearer signal 25.6Kbps, further converted into 64k universal signal 170 _{1-170 5} of 64 kbps. Or a 64k universal signal 171 _{1-171 5} vice versa 3.
2 kbps, 6.4 kbps, 12.8 kbps, 1
After converting into bearer signals of 9.2 kbps and 25.6 kbps, 2.4 kbps, 4.8 kbps and 9.6 are further added.
kbps, 14.4 kbps, and 19.2 kbps.

FIG. 16 shows an outline of the configuration of such a 64k universal signal. 64k universal signal for the data of 6 bits of b ₁ ~b ₆ called envelope format, in the form of wrapping the back and forth S bit is F bits and control bits is a synchronization bit, bearer rate , The same data is repeated several times and transmitted at 64 kbps.

Bearer speed converter 163₁Is 2.4 kb
ps synchronization signal to 3.2 kbps bearer speed
After that, it is converted to the 64k universal signal shown in FIG.
And repeat the same data 20 times. Bearer speed converter 16
3_TwoConverts a 4.8 kbps synchronization signal to a 6.4 kbps synchronization signal.
After converting to bearer speed, the 64k unit shown in FIG.
, And repeat the same data 10 times. Be
Ara speed converter 163 _ThreeIs a synchronization signal of 9.6 kbps.
16 is converted to a bearer speed of 12.8 kbps,
Converted to 64k universal signal shown in
Is repeated 5 times. Bearer speed converter 163_FourIs 14.
4 kbps synchronization signal to 19.2 kbps bearer speed
After conversion to the 64k universal signal shown in FIG.
And repeat the same data three or four times. Bear
La speed converter 163_FiveIs a 19.2 kbps synchronization signal
16 is converted to a bearer speed of 25.6 kbps,
Converted to 64k universal signal shown in
Is repeated twice or three times.

The TSW unit 165 operates according to the allocation setting instructed by the control signal from the control unit 169.
2 which is a bearer signal at 3.2 kbps via the bus 167
The 64k universal signal 170 ₁ for 0CH is multiplexed to generate a 64k multiplexed signal 172 ₁ of “64k universal signal × 20CH”. Or conversely, a 64k multiplexed signal 173 ₁ of “64k universal signal × 20CH”
To 3.2 kbps, 6 for 20CH which is a bearer signal.
Divided into 4k universal signal 171 _1. Hereinafter, similarly, the TSW unit 165 converts the 64k multiplexed signals 172 _{2 to} 172
Generate 2 ₅ . Or conversely, 64k multiplex signal 17
3 _{2-173 5} divides the.

The zero-order group conversion units 166 _{1 to} 166 ₅ are connected to the bus 1
X.68 from a 64k multiplexed signal multiplexed via CH. A 50th multi-frame zero-order group signal is generated, and 64
k transmission lines 174 _{1 to} 174 ₅ . Or do the reverse.

FIG. It shows an outline of the configuration of a zero-order group signal of 50 multiframes.
X. 50 multiframe is 8 bits to be transmitted in 64 kbps, and a 1-bit F-bit top and 6-bit D ₁ to D ₆ of the transmission data is inserted, and the S bit of 1 bit of the last Consists of These F bits, D ₁
ＤD ₆ and S bits are transmitted at a period of 2.5 ms, and predetermined patterns are sequentially inserted into the F bits according to the frame number. The first A bit inserted into the F bit is an alarm bit so that an abnormal or normal time can be determined, and "1", "1", "0",... Indicates that The last S bit is a control bit, and is used for various controls. Six bits D _{1 to} D ₆ are assigned CH data to be inserted according to the frame number for each type of bearer speed.
The bearer rate of 2 kbps, depending on the frame number, 6 bits of b ₁ ~b ₆ of 64k universal signal shown in FIG. 16 of the CH1, 6 bits of b ₁ ~b ₆ of 64k universal signal CH2, ... the order It is designed to be inserted.

In this way, 0 is set for each type of bearer speed.
The next group conversion units 166 _{1 to} 166 ₅ are connected to the bus 167 and generate the X. Fifty multiframes are folded and supplied to the TSW unit 165 again. Or, conversely, the X.R. 50 multi-frames are converted to the zero-order group conversion units 166 _{1 to} 166
Is supplied to 6 _5, it is converted into 64k multiplexed signal.

The X.0 group generated by the 0-order group conversion units 166 _{1 to} 166 ₅ For the 50 multi-frames, the TSW unit 165 generates a multiplexed multi-frame 175 multiplexed into “X.50 multi-frames × 24” according to the allocation setting instructed by the control signal from the control unit 169, and 1.544Mb at the IF module 164 ₁
inserting the TS on the transmission line frame in ps transmission path 162 _1. Or do the opposite.

FIG. 18 is a block diagram of the 1.544 Mbps transmission line 16.
Shows an outline of the transmission line frame structure in 2 _1. Thus, “X.50 multiframe × 24”
The multiplexed multiframe 175 with multiplexed and inserted into the TS of 24TS, housed in any TS transmission path frame of 1.544Mbps transmission line 162 _1, by adding a frame bit F for channel top It is sent to the 1.544Mbps transmission path 162 _1.

Thus, the TDM in the second embodiment is
Converts the low-speed synchronization signals of various transmission rates to bearer rates to generate a universal signal in units of 64 kbps,
Once multiplexed in 64k unit TSW, zero order group conversion is performed,
Further, since the data is multiplexed in the 64 k-unit TSW memory, for example, 1.5 k
It can be multiplexed and transmitted on a high-speed transmission line such as 44 Mbps.

Third Embodiment

In the TDM according to the third embodiment, a coded signal obtained by encoding a voice signal of a voice line as a low-speed transmission path at a high efficiency of 16 kbps, and a coded signal of 1.544 Mbps or 6.3.
Division multiplexing is performed with a high-speed transmission signal on a high-speed transmission path such as 12 Mbps.

FIG. 19 shows an outline of the configuration of the TDM in the third embodiment. This TDM includes voice lines 180 _{1 to} 180 with 4N channels on the low-speed transmission path side.
SS line / SR line 181 ₁ corresponding to _4N and each voice line
～181 _4N are connected, 1.544 for high-speed transmission line side
bps transmission line 182 ₁ ... and 6.312Mbps transmission line 1
83 ₁ ... are connected. In this TDM, high-efficiency encoding IF modules 184 _{1 to} 184 _N having an IF function of a voice line in units of 4 CHs as IF modules,
Have transmission line IF modules 185 ₁ , 186 _1, ... Having IF functions between 1.544 Mbps and 6.312 Mbps transmission lines, respectively.

Further, this TDM comprises only a 64 k unit TSW memory for switching at 64 kbps unit, and the TSW unit 1 which functions as a 64 k unit TSW.
87 is provided. Each IF module 184 ₁ on the low speed side
To 184 _N and the TSW unit 187 are connected via a bus 188. The TSW unit 187 is connected to the high-speed IF modules 185 _1, ..., 186 ₁ ,.

Further, the TDM is controlled by the control unit 190.
And the TSW section 187 has 64
It is possible to set allocation in units of kbps.

[0123] high-efficiency coding IF module 184 ₁ to 1
84 _N, respectively high-efficiency coding section 191 _1-191
N and 1k corresponding to the SS line / SR line used for the SR system which is an individual line signal system provided for each voice line.
And a sampling unit 192 ₁ to 192 _N.

The high-efficiency encoding sections 191 _{1 to} 191 _N sample the analog audio signal on each audio line at 8 kHz, convert the analog audio signal into 2-bit quantized high-efficiency encoded audio signals, and connect each of them to 4 64k multiplexed for each line
generating an audio signal 193 ₁ to 193 _N of bps. These audio signals 193 _{1 to} 193 _N are transmitted via the bus 188 to 64
It is multiplexed by the TSW section 187 of the k-unit TSW. On the contrary, the audio signal 194 ₁ ~194 _N divided into 64kbps units TSW 187, via bus 188, are input to the corresponding housing the CH highly efficient encoding unit 191 ₁ ~191 _N.

FIG. 20 shows an outline of the configuration of such a 64 kbps audio signal. That is, the audio signals 193 _{1 to} 193 _N and 194 _{1 to} 194 _N are obtained by sampling an analog audio signal at 8 kHz, converting the analog audio signal into a highly efficient encoded audio signal quantized by 2 bits, and multiplexing every 4 lines at 64 kbps. Is the voice data. Therefore, if the audio signal 193 _1, voice circuit 180 _1-180
Assuming that ₄ is CH1 to CH4, respectively, each CH2 bit is a total of 8 bits of a 64 kbps transmission signal.

1k sampling section 192₁~ 192_NIs
SS line / SR line corresponding to each audio line
And multiplex every 4 lines connected
ST multiframe 195₁~ 195_NGenerate This
ST multiframe 195 ₁~ 195_NIs a bus 188
Multiplexed by TSW unit 187 of 64k unit TSW via
Is done. Conversely, 64 kbps unit in TSW unit 187
ST multiframe 196 divided into₁~ 196
_NIs the 1k that accommodates the corresponding CH via the bus 188
Sampling unit 192₁~ 192_NIs input to

FIG. 21 shows an outline of the configuration of one TS of such an ST multiframe. FIG. 1A shows an outline of the configuration of one TS of an ST multiframe. FIG. 2B shows an example of the assignment of 1TS.
That is, one TS of the ST multiframe is 8 kbps.
, And each TS is transmitted at a period of 1 ms. Each T
S has a multi-frame configuration including a total of 8 bits including an F bit indicating the head of the frame, an SP bit serving as an alarm bit, and 6 bits including CH1 to CH4 signaling signals.

The TSW unit 187 operates according to the allocation setting indicated by the control signal from the control unit 190, as shown in FIG.
The 64k of the audio signal 193 ₁ to 193 _N, such a high-efficiency encoding audio signals of 16kbps of 4CH content as shown in 0 performs switching to 64kbps units. A TS is assigned to the bus signal on the bus 189 for each transmission line IF module in advance, and a voice signal is transmitted to each TS in units of 64 kbps by a control signal from the control unit 190. The multiplexed signal 197 multiplexed in this manner.
Is “16k encoded voice signal × 4CH × N”. The multiplexed signal 197 is supplied to a transmission path IF module to which a TS has been assigned in advance. For example, the transmission line IF modules 185 _1, ..., 186 ₁ .
It multiplexed signal 198 ₁ ... of TS ", so that the 199 ₁ ... are inputted.

On the other hand, the transmission line IF modules 185 ₁ .
186 ₁ ..., "16k encoded voice signal × 4CH ×
The multiplexed signals 200 ₁ ..., 201 ₁ .
Sent to Each transmission line IF module 185 ₁ ..., 1
86 ₁ ... multiplexed signal 200 sent at different timings from ₁ ..., 201 ₁ ... it is as a multiplexed signal 202 of "16k coded speech signal × 4CH × N", is input to the TSW unit 187. The TSW unit 187 includes a control unit 190
Accordance allocation setting indicated by the control signal from, for partitioning it into audio signals 194 ₁ ~194 _N.

Further, TSW section 187 performs switching of ST multi-frame (4CH) 195 _{1 to} 195 _N in which ₁ TS is the TS shown in FIG. 21 according to the allocation setting instructed by the control signal from control section 190. . The bus signal on the bus 189 is transmitted in advance to the transmission path IF
The control unit 190 is assigned to the TS assigned to each module.
The ST multi-frame is transmitted by the control signal from. The multiplexed ST multi-frame (4CH) 203 multiplexed in this manner becomes “ST frame × N”. Each TS of the multiplexed ST multiframe 203 is TS
The group is supplied to a pre-assigned transmission line IF module. For example, the transmission line IF module 185 ₁ .
186 ₁ ... Each have a multiplexed ST multiframe 2
03, the multiplexed ST multi-frames 204 _1, ..., 205 ₁ , of “ST multi-frame × 22 TS” are input.

On the other hand, the transmission line IF modules 185 ₁ .
186 ₁ ... Multiplexed ST multiframe 206
₁ ..., 207 ₁ ... are sent to the bus 189 at the timing allocated in advance, respectively. Each transmission line IF module 185 ₁ ..., multiplexed sent at different timings from 186 ₁ ... ST multiframe 206
₁ ..., 207 ₁ ... as multiplexing ST multiframe 208 of "ST multiframe × N", is input to the TSW unit 187. TSW section 187 divides this into ST multi-frames 196 _{1 to} 196 _N in accordance with the assignment setting indicated by the control signal from control section 190.

In the transmission line IF module 185 ₁ , the multiplexed signal 198 ₁ and the multiplexed ST multiframe 20 switched by the TSW unit 187 via the bus 189 are output.
4 ₁ is further multiplexed and the 1.544 Mbps transmission line 1
Inserting the TS on the transmission line frame in 82 _1. Or do the opposite.

Similarly, the transmission line IF module 186 ₁
The multiplexed signal 199 ₁ and the multiplexed ST multi-frame 205 ₁ switched by the TSW unit 189 via the bus 189 are further multiplexed and inserted into the TS on the transmission line frame in the 6.312 Mbps transmission line 183 ₁ . Or do the opposite.

FIG. 22 is a cross-sectional view of the 1.544 Mb shown in FIG.
It illustrates an example of a configuration of a transmission line frame in ps transmission path 182 _1. FIG. 1A shows the configuration of the entire transmission path frame. FIG. 3B shows only the TS23 and TS24 portions of the transmission path frame in detail. Thus, the transmission line frame in 1.544Mbps transmission path 182 _1, and a 1-bit F-bit indicating the beginning of a frame, and a respective 64kbps of TS1~TS24 Prefecture. Among them, TS1 to TS22 are:
“16k encoded audio signal × 4CH × 22TS”,
TS23 and TS24 correspond to an ST multiframe. The TS 23 and the TS 24 are transmitted at a cycle of 1 ms as shown in FIG. Each TS has a multi-frame configuration including a total of 8 bits including an F bit indicating the head of the frame, an SP bit serving as an alarm bit, and a 6-bit signaling signal of 6 CHs sequentially allocated from CH1.

Thus, the TDM in the third embodiment is
Generates a 64k audio signal multiplexed for every 4CH when an analog audio signal of an audio line is encoded at 16kbps, and a corresponding signaling signal is similarly multiframed for every 4CH to form a 64kbps transmission signal. Since the data is converted and multiplexed in the 64 k unit TSW, for example, 1.
It can be multiplexed and transmitted on a high-speed transmission line such as 544 Mbps.

Modified example

In the TDM according to the third embodiment, an analog audio signal of an audio line as a low-speed transmission path is transmitted at 16 kbp.
By performing high efficiency coding, 1.544 Mbps or 6.31
Although division multiplexing is performed with a high-speed transmission signal on a high-speed transmission path such as 2 Mbps, the present invention is not limited to this. In the TDM according to the present modified example, an analog audio signal of an audio line as a low-speed transmission line is subjected to 8 kbp high-efficiency encoding to obtain 1.544 Mbps or 6.312 Mbps.
Division multiplexing is performed with a high-speed transmission signal on a high-speed transmission path such as Mbps.

FIG. 23 shows an outline of the configuration of the TDM in this modification. TDM in this modification
Has a voice line 210 _{1 with} 8N channels on the low-speed transmission line side.
To 210 _8N and SS lines / SR lines 211 ₁ ~211 _8N corresponding to each voice line is connected, 1 for high-speed transmission line side.
544 Mbps transmission paths 212 ₁ ... and 6.312 Mbps
Transmission line 213 ₁ ... and are connected. In the TDM according to the present modification, high-efficiency coded IF modules 214 _{1 to} 214 _N having an audio line IF function in units of ₈ CHs as IF modules, 1.544 Mbps and 6.3.
215 ₁ ... transmission line IF module having IF functions, respectively between 12Mbps transmission path, and a 216 ₁ ... and.

Further, the TDM in this modification is 64 k
64k TS for switching in bps
It has a TSW unit 217 composed of only W memory and functioning as a 64k unit TSW. Each of the low-speed side IF modules 214 _{1 to} 214 _N and the TSW unit 217 are
8 are connected. And TSW unit 217, the transmission line IF module 215 ₁ of the high-speed side ..., 216 ₁ ..., An,
They are connected via a bus 219.

Further, the TDM in this modification is
A control unit 220 is provided, and the TSW unit 217 is
Can be assigned in units of 64 kbps.

High-efficiency coding IF module 214 ₁ -2
14 _N are high-efficiency encoding units 221 _{1 to} 221, respectively.
_N and 1k corresponding to the SS line / SR line used for the SR system which is an individual line signal system provided for each voice line.
Sampling units 222 _{1 to} 222 _N are provided.

The high-efficiency encoding sections 221 _{1 to} 221 _N sample the analog audio signal on each audio line at 8 kHz, quantize it into 1 bit, convert it into an 8 kbps high-efficiency encoded audio signal, and are connected to each other. 64 kbps audio signals 223 _{1 to} 223 _N multiplexed for every eight lines. The audio signals 223 _{1 to} 223 _N are multiplexed via the bus 218 in the TSW unit 217 of 64 k-unit TSW. Conversely, the audio signals 224 _{1 to} 224 _N divided by the TSW unit 217 in units of 64 kbps are
, A high-efficiency coding unit 221 accommodating the corresponding CH
Is input to the _{1 ~221 N.}

FIG. 24 shows an outline of the configuration of such a 64 kbps audio signal. That is, the audio signals 223 _{1 to} 223 _N and 224 _{1 to} 224 _N are obtained by sampling the analog audio signal at 8 kHz, quantizing it with 1 bit, encoding it with high efficiency, and multiplexing every 8 lines.
kbps audio data. Therefore, audio signal 2
For 23 _1, respectively voice circuit 210 ₁ to 210 ₈ C
If H1 to CH8 are set, each CH1 bit becomes a 64-bit transmission signal of 8 bits in total.

1k sampling section 222₁~ 222_NIs
SS line / SR line corresponding to each audio line
And multiplex every 8 connected lines
ST Multiframe 225₁~ 225_NGenerate This
ST multiframe 225 ₁~ 225_NIs the bus 218
Multiplexed by TSW unit 217 of 64k unit TSW via
Is done. Conversely, ST divided by TSW section 217
Multi frame 226 ₁~ 226_NVia bus 218
And a 1k sampling unit 222 accommodating the corresponding CH.
₁~ 222_NIs input to

FIG. 25 shows an outline of the configuration of one TS of such an ST multiframe. FIG. 1A shows an outline of the configuration of one TS of an ST multiframe. FIG. 2B shows an example of the assignment of 1TS.
That is, one TS of the ST multiframe is 8 kbps.
, And each TS is transmitted at a cycle of 1.25 ms. Each TS has a multi-frame configuration including a total of 10 bits including an F bit indicating a head of a frame, an SP bit serving as an alarm bit, and 8 bits including signaling signals of CH1 to CH8.

The TSW section 212 performs switching in accordance with the assignment setting indicated by the control signal from the control section 220, similarly to the TSW section 187 in the third embodiment. The multiplexed signal 227 obtained by multiplexing the 64k audio signals 223 _{1 to} 223 _N is “8k encoded audio signal × 8CH”.
× N ”. The signal of each TS of the multiplexed signal 227 is supplied to a transmission line IF module to which a TS is assigned in advance. For example, the transmission line IF modules 215 ₁ ,.
216 ₁ ... Respectively include “8” of the multiplexed signal 227.
multiplexed signal 2 of k-coded audio signal × 8CH × 21TS ”
28 ₁ ..., so that the 229 ₁ ... is input.

On the other hand, the transmission line IF modules 215 ₁ .
216 ₁ ..., "8k encoded audio signal × 8CH × 2
Multiplexed signal 230 ₁ ... of 1TS ", 231 ₁ ... are sent to the bus 219 at the timing allocated in advance, respectively. Each transmission path IF module 215 ₁ ..., 21
6 ₁ ... multiplexed signal 230 sent at different timings from ₁ ..., 231 ₁ ... is, "8k coded speech signal ×
As a multiplexed signal 232 of 8CH × N ″, the TSW unit 21
7 is input. The TSW unit 217 performs the assignment setting indicated by the control signal from the control unit 220,
This is divided into audio signals 224 _{1 to} 224 _N.

Similarly, a multiplexed ST multiframe (8CH) 233 obtained by multiplexing ST multiframes (8CH) 225 _{1 to} 225 _N in the TSW section 217 is “ST frame × N”. Each TS of the multiplexed ST multiframe 233 is a transmission path I to which a TS group is assigned in advance.
It is supplied to the F module. For example, the transmission line IF modules 215 _1, ..., 216 ₁ .
S "multiplexed ST multiframes 234 ₁ ... 235 ₁ ...
Is entered.

On the other hand, the transmission line IF modules 215 ₁ .
216 ₁ ... Multiplexed ST multiframe 236
₁ ..., 237 ₁ ... are sent to the bus 219 at the timing allocated in advance, respectively. , 216 ₁ ... Multiplexed ST multi-frames 236 transmitted at different timings from the transmission line IF modules 215 ₁ ,.
₁ ..., 237 ₁ ... as multiplexing ST multiframe 238 of "ST multiframe × N", is input to the TSW unit 217. The TSW unit 217 divides this into ST multi-frames 226 _{1 to} 226 _N in accordance with the allocation setting indicated by the control signal from the control unit 220.

Transmission Line IF Module 215₁216
₁Is switched on by the TSW unit 217 via the bus 219.
Multiplexed signal 198₁, 199₁And multiplex ST
Multi frame 204₁, 205₁Is further multiplexed,
1.544 Mbps transmission line 212 ₁And 6.312M
bps transmission path 213₁TS on transmission line frame in
Insert Alternatively, do the reverse.

FIG. 26 is a diagram showing the 1.544 Mb shown in FIG.
ps transmission path 212₁Of transmission line frame configuration
This is an example. FIG. 3A shows the transmission line frame.
1 shows the configuration of the entire system. FIG. 4B shows the transmission path frame.
Of which only the part where ST multiframe is inserted is detailed
Show. Thus, the 1.544 Mbps transmission line 212 ₁
The transmission line frame in
And multiplexed with 64 kbps multiplexed signal
And a TS into which the ST multiframe is inserted.
I have. Among them, TS1 to TS21 are “8k encoded sound”.
Voice signal × 8CH × 21TS ”, and the rest is multiplexed ST
Equivalent to multi-frame. This remaining TS is
As shown in (b), each TS is transmitted at a cycle of 1.25 ms.
It is. Each TS has an F bit indicating the beginning of the frame and an alarm
1-bit F / A bit into which the data bits are inserted alternately
And 9 bits for 9CH allocated in order from CH1
And a total of 10 bits
It has a multi-frame configuration.

As described above, in the TDM according to the present modification, as in the third embodiment, although the transmission speed of the encoded audio signal is different, the frame configuration of the low-speed IF module and the high-speed IF module is different. By devising, even if the audio signal is encoded at a high efficiency of 8 kbps, 6
1.544Mbps only with 4k unit TSW memory
Multiplexed and transmitted on such a high-speed transmission path.

[0153]

As described above, according to the first or third aspect of the present invention, the low-speed transmission line interface means and the high-speed transmission line interface means transmit a transmission signal of a low transmission speed to be multiplexed at a higher speed. Is converted to the transmission speed of the TDM or vice versa, so that the TSW part, which is an essential function of the TDM, can be constituted only by the converted transmission speed unit. Conventional TDM that has been assigned
Thus, the circuit scale can be reduced. Furthermore, since it is only necessary to set the TSW allocation for the same transmission rate unit only, the complexity of setting the TSW can be reduced.

According to the second or fourth aspect of the present invention, transmission signals of various low transmission speeds are converted into higher transmission signals, and the transmission signals are temporarily switched by a time switch in transmission speed units. After multiplexing for a predetermined number of channels, the frame is formed into a multi-frame, turned back again, and the transmission time unit of the transmission signal is switched by the same time switch, or vice versa. Thereby, TD
The TSW part, which is an essential function of M, can be constituted only by the converted transmission speed unit, and the complexity of allocation setting can be reduced.

Further, according to the fifth or sixth aspect of the present invention, a high-efficiency coded voice signal and a signaling signal of an individual signal system with an exchange as transmission signals on a low-speed transmission line are transmitted in the apparatus. By converting to the first or third transmission rate, even in a TDM that is generally divided and multiplexed at 64 kbps, only the 64 k unit TSW is used.
Division multiplexing with a high-speed transmission path can be performed.

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating an outline of a configuration of a TDM according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram showing a configuration of a TDM in a first embodiment for performing division multiplexing between a voice line as a low-speed transmission line and a high-speed transmission line.

FIG. 3 is an explanatory diagram illustrating an outline of a configuration of an audio signal according to the first embodiment.

FIG. 4 shows ST multiframe 1 in the first embodiment.
FIG. 3 is an explanatory diagram illustrating an outline of a configuration of a TS.

FIG. 5 is an explanatory diagram illustrating an example of a configuration of a transmission line frame on a 1.544 Mbps transmission line in the first embodiment.

FIG. 6 is a block diagram showing a main part of the configuration of a TDM IF module according to the first embodiment;

FIG. 7 shows an ADCPM codec unit and 32k / 64k of the ADPCMIF module in the first embodiment.
FIG. 7 is an explanatory diagram illustrating an outline of an operation of a conversion unit.

FIG. 8 is a block diagram showing a 1k sampling unit and an ST frame generation unit of the ADPCMIF module according to the first embodiment;
It is an explanatory view showing an outline of operation of a termination part.

FIG. 9 is an explanatory diagram illustrating an outline of an operation of a bus IF unit of the ADPCMIF module in the first embodiment.

FIG. 10 is an explanatory diagram illustrating an outline of an operation of a TSW unit in the first embodiment.

FIG. 11 shows a bus IF unit, ST frame termination / generation unit, and S
FIG. 9 is an explanatory diagram illustrating an outline of an operation of a T frame generation / termination unit.

FIG. 12 is an explanatory diagram illustrating an outline of an operation of a transmission line frame generation / termination unit of the transmission line IF module according to the first embodiment.

FIG. 13 illustrates a bus IF unit and a ST of a transmission line IF module when the high-speed transmission line is a 6.312 Mbps transmission line.
FIG. 9 is an explanatory diagram illustrating an outline of operations of a frame termination / generation unit and an ST frame generation / termination unit.

14 is an explanatory diagram illustrating an outline of an operation of a transmission line frame generation / termination unit of the transmission line IF module illustrated in FIG. 6 when the high-speed transmission line is a 6.312 Mbps transmission line.

FIG. 15 is a configuration diagram illustrating an outline of a configuration of a TDM in a second embodiment.

FIG. 16 is an explanatory diagram showing an outline of a configuration of a 64k universal signal in the second embodiment.

FIG. 17 shows an example of the X.300 in the second embodiment. FIG. 4 is an explanatory diagram illustrating an outline of a configuration of 50 multiframes.

FIG. 18 is an explanatory diagram showing an outline of a transmission line frame configuration of a 1.544 Mbps transmission line in the second embodiment.

FIG. 19 is a configuration diagram illustrating an outline of a configuration of a TDM in a second embodiment.

FIG. 20 is an explanatory diagram illustrating an outline of a configuration of a 64 kbps audio signal in the third embodiment.

FIG. 21 is an explanatory diagram showing an outline of a configuration of one TS of an ST multiframe in the third embodiment.

FIG. 22 is an explanatory diagram illustrating an example of an outline of a configuration of a transmission line frame of a 1.544 Mbps transmission line in the third embodiment.

FIG. 23 is a configuration diagram illustrating an outline of a configuration of a TDM in the present modification.

FIG. 24 is an explanatory diagram showing an outline of a configuration of a 64 kbps audio signal in the present modified example.

FIG. 25 shows 1T of ST multiframe in the present modification.
FIG. 3 is an explanatory diagram illustrating an outline of a configuration of S.

FIG. 26 is an explanatory diagram showing an example of the configuration of a transmission line frame of a 1.544 Mbps transmission line in the present modification.

FIG. 27 is a configuration diagram showing an outline of a configuration of a conventional TDM.

FIG. 28 is an explanatory diagram showing an outline of a configuration of a conventional 32 k ADPCM audio signal and 64 k audio signal.

FIG. 29 is an explanatory diagram showing an outline of a configuration of a conventional signaling signal.

FIG. 30 is an explanatory diagram showing an outline of a configuration of a conventional ST multiframe.

FIG. 31 is an explanatory diagram showing an outline of a configuration of a conventional bearer signal.

FIG. FIG. 4 is an explanatory diagram illustrating an outline of a configuration of a frame transmitted in 50 multiframes.

FIG. 33 is an explanatory diagram showing an outline of a configuration of a bus signal multiplexed by a conventional 64k unit TSW.

[Explanation of symbols]

60 ₁ ... low-speed IF module 61 ₁ ..., 62 ₁ ..., 70 ₁ ..., 71 ₁ ... transmission line IF module 63 and 72 TSW unit 65 ₁ to 65 _2N voice line 66 ₁ -66 _2N SS line / SR lines 67 ₁ ... 1.544 Mbps transmission line 68 ₁ ... 6.312 Mbps transmission line 69 _{1 to} 69 _N ADPCMIF module 73, 74 Bus 75 Control unit 76 _{1 to} 76 _N ADPCM encoding unit 77 _{1 to} 77 _N Sampling unit 78 _{1 to} 78 _N , 79 _{1 to} 79 _N audio signals 80 ₁ to 80 _N , 81 _{1 to} 81 _N ST multiframes 82, 83 ₁ …, 84 ₁ …, 85 ₁ …, 86 ₁ …, 87,
Multiplexed signals 88, 89 ₁ …, 90 ₁ …, 91 ₁ …, 92 ₁ …, 93 Multiplexed ST multiframe

Claims (6)

[Claims] 1. A first transmission signal having a first transmission rate is multiplexed for each first number of channels to form a second transmission signal having a second transmission rate higher than the first transmission rate. Multiplexing means for generating, and a first multi-frame for multi-frame-forming a third transmission signal having a third transmission rate transmitted and received corresponding to the first transmission signal for each of the first number of channels Low-speed transmission line interface, comprising: a conversion unit; and a parallel conversion unit that converts the second transmission signal generated by the multiplexing unit and each frame multi-framed by the first multi-frame conversion unit into parallel. Means, time switch means for switching the parallel data converted by the parallel conversion means to the second transmission rate unit, and time switch means Separating means for separating the second transmission signal and each of the multi-frames from the switched parallel data, and converting the data of each of the frames separated by the separating means into the third transmission rate Second multi-frame generating means for performing multi-frame processing for every second channel number greater than the first channel number, and the second transmission signal and the second multi-frame separated by the separating means. A time slot multiplexing device comprising: a time slot inserting unit multiplexing the multi-frame data multi-framed by the multiplexing unit and inserting the multiplexed data into a predetermined time slot. 2. rate conversion means for converting transmission signals having mutually different transmission rates into the number of channels corresponding to the transmission rates so as to have a higher first transmission rate; First time switch means for multiplexing the speed conversion signal converted by the speed conversion means in units of a predetermined number of channels within the number of channels converted by the conversion means; and the time switch means for each of the transmission signals. Means for converting the switching data switched according to the above into multi-frames per frame at the first transmission rate; and converting the multi-frame data multi-framed by the multi-frame means into the first transmission rate unit. A second time switch means for switching; Division multiplexer when the switching data is switched by the pitch means multiplexes characterized by comprising a time slot insertion means for inserting a predetermined time slot. 3. A first transmission signal having a first transmission rate and a first transmission signal having a first transmission rate are extracted from a transmission signal inserted in a predetermined time slot.
Extracting means for extracting multi-frame data multi-framed for each number of channels, and extracting the multi-frame data extracted by the extracting means into a second frame having a second transmission rate lower than the first transmission rate. After converting to the second transmission signal,
Multi-frame forming means for forming a multi-frame for each number of channels, and the first frame extracted by the extracting circuit.
A high-speed transmission line interface means comprising: a parallel conversion means for converting the transmission signal of each of the frames and the respective frames multi-framed by the multi-frame conversion means into parallel data; and transmitting the parallel data converted by the parallel conversion means to the Time switching means for switching in units of one transmission rate; separating means for separating the first transmission signal and each frame multi-framed by the multi-frame forming means from switching data switched by the time switching means. And dividing the first transmission signal separated by the separation means into third transmission signals having a third transmission speed lower than the first transmission speed for each of the second number of channels. Means, and the multi-frame separated by the separating means Wherein the reduction is the frame data to each number of said second channel second
Time-division multiplexing comprising: multi-frame conversion means for converting a second transmission signal having the second transmission rate to be transmitted / received in response to the transmission signal. Device. 4. Extraction means for extracting multi-framed data having a first transmission rate from a transmission signal inserted in a predetermined time slot, and extracting the multi-framed data extracted by the extraction means into a first frame. First switching means for switching every time slot predetermined in transmission rate units, and extracting data of a predetermined number of channels for each frame from the multi-frame data switched by the first switching means Dividing means for dividing the transmission signal into the transmission signals of the first transmission rate, and a second time for dividing each divided data divided by the dividing means into divided transmission signals corresponding to the number of channels. Switch means; and said channel switched by said second time switch means. Division multiplexer when characterized by comprising a speed converting means for converting from the first transmission speed corresponding the division transmission signal Le few minutes a slow transmission speed. 5. The time-division multiplexing apparatus according to claim 1, wherein the first transmission signal is a high-efficiency coded voice signal, and the third transmission signal is a signaling signal. 6. The time-division multiplexing apparatus according to claim 3, wherein the third transmission signal is a high-efficiency coded voice signal, and the second transmission signal is a signaling signal.