JP3447649B2 - Time division multiplexer - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a time division multiplexer, and more particularly to a time division multiplexer 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. ) Or 6.312 Mbps or the like through a large-capacity high-speed digital leased line, various signals such as an audio signal, an image signal such as a video conference, or a data signal are transmitted by a time division multiplexer (hereinafter, referred to as
Abbreviated as TDM. ), It is time division multiplexed and efficiently transmitted. In such 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. ) Is rearranged in an arbitrary order for each division unit, multiplexed, and transmitted as a high-speed transmission signal. Or vice versa. For the interface of TDM (InterFace: abbreviated as “IF” hereinafter), refer to The Telecommunication Technology C.
ommittee: Hereinafter abbreviated as TTC. ) Has been standardized.

Among the standardizations carried out by TTC, TDM
-TTC standard JJ-20-3 that defines IF between TDM
1 is 64 kbps which is sampled at a sampling period of 125 microseconds (μs) and PCM-encoded based on the transmission of a voice signal (hereinafter, abbreviated as kbps).
It is defined that (8 bits) is used as a division unit and a transmission signal of 64 kbps or less is multiplexed and transmitted at 64 kbps. 32 kb for a transmission signal of 64 kbps or less
Adaptive Differential Pulse Code Modulation that is highly efficient coded to ps (4 bits)
ion: Hereinafter, abbreviated as ADPCM. ) Coded speech signal,
SR (Signal Receive), which is an individual line signaling system that has a signal path for each voice line between the bearer signal and the exchange.
Set the SS (Signal Send) line / SR line used in the method 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
There are various transmission rates such as s and 25.6 kbps.

FIG. 27 shows an outline of the configuration of a conventional TDM. This TDM includes voice lines 10 ₁ to 10 _2N having 2N (N is a natural number) channels on the low-speed transmission path side (N is a natural number) and SS lines / SR lines 11 ₁ to corresponding to each voice line. 11 _2N and the number of CH is M
(M is a natural number) data signal lines 12 _{1 to} 12 _M are connected, and the high speed transmission line side has a transmission line 13 of 1.544 Mbps.
₁ ... and 6.312 Mbps transmission line 14 ₁ ... Are connected. This TDM is a low-speed voice signal and data obtained by multiplexing a voice signal and a data signal, which are low-speed transmission signals, and transmitting them as a high-speed transmission signal to a high-speed transmission line, or dividing a high-speed transmission signal from the high-speed transmission line. The signal is transmitted to each low speed line.

Such a TDM is an IF module, which is an ADPC MIF module 15 ₁ to ₁ having an IF function with the low speed side voice lines 10 ₁ to 10 _{2 N} , respectively.
5 _2N and bearer speed converters 16 _{1 to} 16 _M as data communication IF modules each having an IF function between the data signal lines 12 _{1 to} 12 _M and high speed side 1.544 _M
bps transmission line 13 _1, ... 6.312 Mbps transmission line 14 ₁
, And transmission line IF modules 17 ₁ ... 18 ₁ ...

Further, TDM is a high-speed transmission from the low-speed transmission line side.
Multiplex direction to the transmission side and from the high-speed transmission line side to the low-speed transmission line side
"64 kbps PC for each separation direction
M coded audio signal (8 bits) × K (K is natural
Number 19 ”with memory capacity ₁, 19₂With 64 kb
64k unit TSW20 for switching in ps unit
Similarly, 8k unit that performs switching in units of 8 kbps
Switching in units of 0.4 kbps and TSW
An audio signal TSW21 having a 0.4 k unit TSW;
3.2k unit for switching in 3.2kbps unit
And a data signal TSW22 including TSW.

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

[0008] Moreover, TDM has a control unit 26, the control signal 27 ₁ to 27 _4, the allocation settings for 64k units TSW20 respectively 8 of the audio signal TSW21
Allocation setting for k unit TSW and 0.4k unit TSW,
The allocation setting for the 3.2k unit TSW of the data signal TSW22 can be performed.

ADPCMIF module 15₁~ 15_2N
Is each voice line 10₁-10 _2NCorresponding to AD
PCM encoder 28₁~ 28_2NAnd for each voice line
S used for the SR system which is the provided individual line signal system
Sampling unit 29 corresponding to S line / SR line₁~ 29_2N
It has and. The signal is transmitted on the SS line and received on the SR line.
Believed

ADPCM encoder 28₁~ 28_2NIs each
Voice line 10₁-10_2NOf analog voice signal encoding
Go to 30 kbps ADPCM coded audio signal 30
₁~ 30_2NTo generate. Or, on the contrary, 32 kbp
s ADPCM coded audio signal 31₁~ 31_2NDecrypt
Then, an analog voice signal is generated, and the voice line 10₁~ 1
0 _2NSend to. Sampling unit 29₁~ 29_2NIs each
S which is an individual line signal system provided corresponding to a voice line
SS signal of SS line / SR line used for R system is 0.8k
Signaling signal 32 sampled in Hz₁~ 32
_2NTo generate. Or vice versa, 0.8 kHz signal
Ring signal 33₁~ 33_2NIs output as an SR signal.

ADPCM-encoded audio signal 3 ADPCM-encoded by the ADPCM encoders 28 _{1 to} 28 _2N
0 ₁ to 30 _2N are 32 with the number of CHs of 2N through the bus 23.
8k of audio signal TSW21 as kADPCM audio signal
It is supplied to the unit TSW and multiplexed. On the other hand, the 32 k ADPCM audio signals 31 ₁ to 312 _N divided into each CH by the 8 k unit TSW of the audio signal TSW21 are supplied to the ADPCM encoding units 28 _{1 to} 28 _{2 N} of the corresponding CH via the bus 23. . Sampling unit 29 ₁ ~
Signaling signal 3 sampled by 29 _2N
2 _{1 to} 32 _2N are supplied to the 0.4k unit TSW of the audio signal TSW 21 as a signaling signal having a CH number of 2N via the bus 23 and are multiplexed. On the other hand, 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 unit TS in the audio signal TSW21
The W performs switching in units of 8 kbps according to the allocation setting instructed by the control signal 27 ₂ from the control unit 26, and the number of CHs obtained by multiplexing the 32kADPCM voice signals 30 ₁ to 30 _2N of _2N is _2N. 64 kbp
s voice signal 36. Or vice versa, CH
The number of N is 64 kbps, and the number of channels is 2N.
32 kbps 32 kADPCM audio signal 31 _{1 to} 3
Divide into 1 _2N . 0.4 in audio signal TSW21
The k unit TSW is 0.4 kbps according to the allocation setting instructed by the control signal 27 ₃ from the control unit 26.
Switching is performed in units to multiplex signaling signals 32 _{1 to} 32 _2N having a number of CHs of _2N and S of 64 kbps.
Convert to a T (STatus) multi-frame 38. Or vice versa, the 64 kbps ST multi-frame 39,
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 kADPCM audio signal and the 64 kbps audio signal shown in FIG. In the figure (a), 32
32 kADPCM audio signal 30 ₁ to 30 _{2N of} kbps,
Shows an overview of 31 ₁ ~31 _2N configuration. FIG. 6B shows 6
An outline of the configuration of the 4 kbps audio signals 36 and 37 is shown.
That is, in the 32 kADPCM audio signal, the analog audio signal is sampled at 8 kHz in the IF module, and is represented by 4 bits b _{1 to} b ₄ per CH 3
It becomes a transmission signal of 2 kbps. 8 of audio signal TSW21
The k unit TSW outputs 8k from this 32k ADPCM audio signal.
Switching to a unit and multiplexing 2CH, 64
Converted to a voice signal of kbps.

FIG. 29 shows the 0.8 kbps shown in FIG.
2 shows an outline of the configuration of the signaling signal of the above. In this way, the signaling signal is obtained by sampling the SS line / SR line provided for each voice line in the IF module at a cycle of 0.8 kHz.

FIG. 30 shows an outline of the structure of the ST multiframe of 64 kbps shown in FIG. The figure (a) shows the outline of a structure of ST multi-frames 38 and 39 of 64 kbps. FIG. 2B shows an example of allocation of each time slot (hereinafter, abbreviated as TS). That is, ST multiframe 3
8 and 39 are transmission signals of 64 kbps of 8TS,
Each TS is transmitted in a 1.25 millisecond (ms) cycle. In each TS, a 1-bit F / A bit in which an F bit indicating the beginning of a frame and an alarm bit indicating the occurrence of an alarm are alternately output, and, for example, CH9, CH2, CH1, ... Of 0.8 kbps signaling are provided. The multi-frame structure has a total of 10 bits consisting of 9 bits arbitrarily allocated.

The bearer rate converters 16 _{1 to} 16 _M have transmission rates of 2.4 kbps, 4.8 kbps, and 9.6 kbp.
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.
2 kbps and 25.6 kbps bearer signals 40 ₁ to 4
Generate 0 _M. Or vice versa, 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 and 9.6 kb respectively
Synchronous signals of ps, 14.4 kbps and 19.2 kbps are generated and sent to the respective 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,
The bearer signal with the number of CHs of M is supplied to the data signal TSW22 including the 3.2k unit TSW and multiplexed.
On the other hand, the bearer signals 41 _{1 to} 41 _M divided for each CH by the data signal TSW22 are supplied to the bearer signal conversion units 16 _{1 to} 16 _M of the corresponding CH via the bus 23.

FIG. 31 shows an outline of the configuration of the bearer signal described above. In this way, the bearer signal is transmitted in the form of 6-bit unit data of b _{1 to} b ₆ called envelope format, in which the front and back are wrapped with F bit which is a synchronization bit and S bit which is a control bit. To be 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
It is converted into a 0-order group signal 43 of 4 kbps. Alternatively, conversely, the 0-th order group signal 44 of 64 kbps is divided for each CH and converted into bearer signals 41 _{1 to} 41 _M. This 0
The next group of signals is the International Telecommunication Union-Telecommun
ication Standardization Sector (ITU-T) Recommendation X. Complies with 50 multiframes.

FIG. 32 shows the X.V. It shows an outline of the structure of a frame transmitted in 50 multiframes. Thus X. The frame transmitted in 50 multi-frames includes ₆ TSs D _{1 to} D ₆ and a TS in which F bits are inserted.
And a TS into which S bits are inserted. The bit pattern to be inserted into the F bit and the CH data to be inserted into each TS of D _{1 to} D ₆ are determined by the TTC standard JJ-20-31 as the CH number to be inserted in advance with respect to the frame number. There is. X. The 50 multi-frame is a multi-frame in which a transmission signal of 64 kbps is multi-configured per one frame.

Voice signal TSW21 and data signal TS
Audio signal 36 multiplexed by W22, ST multi-frame 38, X.W. 50 multi-frame 0th order group signal 4
3 is a bus 24 as a transmission signal of 64 kbps.
Is supplied to the TSW 20 in units of 64k and is multiplexed. On the other hand, 64 kbps voice signal 37 divided by 64 k unit TSW 20, ST multi-frame 3
9, X. The 0th-order group signal 44 of 50 multiframes is transmitted through the bus 24 and is 8k in the audio signal TSW21.
Unit TSW and 0.4k unit TSW and data signal TS
It is supplied to W22.

The 64 k unit TSW 20 performs switching in units of 64 kbps according to the allocation setting instructed by the control signal 27 ₁ from the control unit 26, and is assigned in advance to each of the transmission line IF modules 17 _1, ..., 18 ₁ . 24T of the transmission frames on the bus 25
The bus signals 45 ₁ ... And the bus signals 46 ₁ ... As switching data are sent to S or 96TS. Two
Bus signals 45 ₁ ... it is made of 4TS, taken in ₁ ... transmission line IF module 17, is sent is converted into high-speed transmission signal having a predetermined frame format in 1.544Mbps transmission path 13 ₁ .... Bus signals 46 ₁ ... it is made of 96TS, taken to the transmission line IF module 18 ₁ ..., is transmitted is converted into high-speed transmission signal having a predetermined frame format in 6.312Mbps transmission path 14 ₁ ....

On the other hand, the 1.544 Mbps transmission line 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
Bus signal 47 _{1 of} 64 kbps consisting of TS is transferred to bus 2
5, and supplies it to the 64k unit TSW 20. Also,
The high-speed transmission signal of the 6.312 Mbps transmission line 14 ₁ ...
The format converted by the transmission path IF module 18 ₁ ... And the TS pre-assigned to each of the transmission path IF modules 17 ₁ ...
The bus signal 48 ₁ ...
Supply to the unit TSW20.

FIG. 33 shows an outline of the structure of a bus signal multiplexed by the 64k unit TSW 20 (actually, parallel conversion into 8 bit units).
In this way, the bus signal is switched every 64 kbps, and in one of the time slots of the transmission signal transmitted on the bus 25, the audio signal 49 of 64 kbps multiplexed by the 8 k unit TSW of the audio signal TSW21. , ST multi-frame 50 multiplexed by 0.4k unit TSW of audio signal TSW21, data signal T
The X.X multiplexed by the 3.2k unit TSW of SW22. A universal signal 51 of 50 multiframes is assigned.

As described above, the TDM sends 8 k-unit TSW, 0.4 k-unit TSW, 3.
After multiplexing to 64 kbps by 2k unit TSW, 6
It is possible to freely allocate the low-speed transmission signal to the high-speed transmission path by multiplexing and transmitting the higher-speed signal in the 4k unit TSW.

A technique relating to such TDM is disclosed in, for example, Japanese Patent Laid-Open No. 10-322296 "MTDM device multiplexing method". This Japanese Patent Laid-Open No. 10-3222
In the TDM to which the technique disclosed in Japanese Patent Laid-Open No. 96 is applied, for example, low-speed transmission signals of 0.8 kbps are grouped and collectively multiplexed in 64 k-unit TSW, so that the delay time of low-speed transmission signals in the device is increased. 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. 10-322296 is applied, since transmission signals of low transmission rates different from each other are handled, In addition to 64k unit TSW, 0.8k unit TSW, 3.2k unit TSW
It was equipped with a SW and an 8k unit TSW. Therefore,
There is a problem that the circuit scale of the TSW portion in the TDM becomes very large. Furthermore, large-scale TS
If W is provided, the complexity of the allocation setting by the control unit also increases, leading to an increase in size and complexity of the device.
It was desired to simplify the SW part.

Therefore, an object of the present invention is to provide a TDM which simplifies the TSW portion, downsizes the device, and divides and multiplexes transmission signals of various transmission speeds.

[0029]

According to a first aspect of the present invention, (a) a first transmission signal having a first transmission rate is multiplexed for each first channel number, 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 / received corresponding to the first transmission signal A first multi-frame converting unit that multi-frames each channel, a second transmission signal generated by the multiplexing unit, and each frame multi-framed by the first multi-frame converting unit are parallel-converted. Low-speed transmission line interface means including parallel conversion means,
(B) A time switch means for switching the parallel data converted by the parallel conversion means to the second transmission speed unit, and (c) a second transmission signal and a multiframe from the parallel data switched by the time switch means. Demultiplexing means for demultiplexing each converted frame, and multiframes for each second channel number larger than the first channel number after converting the data of each frame demultiplexed by this demultiplexing means to a third transmission rate Second multi-frame converting means, the second transmission signal separated by the separating means, and the multi-frame data converted into the multi-frame by the second multi-frame forming means are multiplexed and inserted into a predetermined time slot. High-speed transmission line interface means including time slot inserting means for performing time division multiplexing To be provided.

That is, according to the first aspect of the invention, the low-speed transmission line interface means is provided for each first number of channels.
A first transmission signal having a first transmission rate is multiplexed with a second transmission signal having a speed higher than the first transmission rate, and a third transmission signal transmitted / received in response to the first transmission signal. Is converted into multi-frames, converted into parallel data by 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 line interface means.
The high-speed transmission line interface means temporarily separates the second transmission speed from the data of each frame of the multi-framed data. The separated data of each frame is converted into the third transmission rate by the second multi-frame conversion means, converted into multi-frames for each second channel number larger than the first channel number, and separated by the separation means. The second done
And is inserted into a predetermined time slot of the transmission path frame of the high speed transmission path.

[0031]

[0032]

According to the second aspect of the present invention, (a) the transmission signal inserted in the predetermined time slot is converted into a multi-frame for each of the first transmission signal having the first transmission rate and the first number of channels. Extracting means for extracting the multi-frame data, and converting the multi-frame data extracted by the extracting means into a second transmission signal having a second transmission speed lower than the first transmission speed and then the first channel The multi-frame converting means for converting into a multi-frame for each second channel number smaller than the number, the first transmission signal extracted by the extracting means and each frame multi-framed by the multi-frame converting means are converted into parallel data. High-speed transmission line interface means including parallel conversion means for performing parallel conversion, and A time switch means for switching data in a first transmission rate unit, and (c) a first transmission signal and each frame multiframed by the multiframe conversion means are separated from the switching data switched by the time switch means. Separating means, and the first transmission signal separated by the separating means for each second channel number to a third transmission speed lower than the first transmission speed.
Dividing means for dividing into a third transmission signal having a transmission rate of 1 to 2 and each of the multiframe frame data separated by the separating means to the second for every second channel number.
The low-speed transmission line interface means including a multi-frame conversion means for converting into a second transmission signal having a second transmission speed which is transmitted and received corresponding to the transmission signal of 1.

That is, according to the second aspect of the present invention, when the transmission signal extracted from the transmission path frame on the high speed transmission path is divided into the low speed transmission path, the low speed transmission path is multiplexed with the transmission path frame on the high speed transmission path. The procedure is the reverse of that of the invention described in claim 1.

[0035]

[0036]

In a third 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 that.

[0038] In a fourth aspect of the present invention is a division multiplexer time according to claim 2, the third transmission signal is high-efficiency encoded audio signal, the second transmission signal is a signaling signal It is characterized by that.

That is, in the invention according to claim 3 or 4 , a high-efficiency coded voice signal and a signaling signal of an individual signaling system with the exchange are transmitted as a transmission signal of the low-speed transmission path in the device. By converting to the first or third transmission rate, even in TDM that is generally division-multiplexed at 64 kbps, division-multiplexing with a transmission line of a high-speed transmission line can be performed only by a 64 k unit time switch. You can

[0040]

DETAILED DESCRIPTION OF THE INVENTION

[0041]

EXAMPLES The present invention will be described in detail below with reference to examples.

First Embodiment

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

The feature of the TDM in the first embodiment is that the TSW section is composed of only the TSW of 64k unit, and the division multiplexing is performed between the transmission signal of 64 kbps or less and the high-speed transmission signal. There is a point that can. Therefore, the TSW unit 63 is connected with a transmission line IF module as a high-speed side IF module of a type corresponding to the type of a low-speed transmission line to which the low-speed side IF module is connected, and transmits a transmission signal of 64 kbps or less at a low speed. By converting to 64kbps by the side IF module, TS in 64k unit
Only W can be used for division multiplexing.

The low speed transmission line connected to the low speed side IF module 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 path to be accommodated, the corresponding low-speed side IF module and the corresponding transmission path IF module are connected to the TSW unit 63 to perform the above-mentioned division multiplexing. In the following, 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 described in order.

FIG. 2 shows an outline of the structure of the TDM in the first embodiment for performing division multiplexing between the voice signal on the voice line as the low speed transmission line and the high speed transmission signal on the high speed transmission line. is there. In this case, T in the first embodiment
The DM has a voice line 65 with 2N CHs on the low-speed transmission line side.
_{1 to} 65 _2N and SS / SR lines 66 _{1 to} 662 _2N corresponding to each voice line are connected, and 1.54 on the high-speed transmission line side.
The 4 Mbps transmission line 67 ₁ ... And the 6.312 Mbps transmission line 68 ₁ ... Are connected. In this TDM, as the IF modules, ADPCMIF modules 69 _{1 to} 69 _N having an IF function of a voice line in units of 2CH 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 64k unit TSW memory for performing switching in a unit of 64kbps, and the TSW section 72 which functions as a 64k unit TSW.
Is equipped with. Low-speed side IF modules 69 _{1 to} 69 _N
And the TSW unit 72 are connected via a bus 73. TSW unit 72 and high speed side IF module 70
₁ ..., 71 ₁ ..., Are connected via a bus 74.

Furthermore, this TDM has a control unit 75, and 64 kbp in the TSW unit 72 is generated by a control signal.
It is possible to set allocation in s units.

ADPCMIF module 69₁~ 69
_NAre ADPCM encoding units 76, respectively. ₁~ 76_NAnd each
SR, which is an individual line signaling system provided for voice lines
Sampling corresponding to SS line / SR line used in the system
Part 77₁~ 77_NIt has and.

The ADPCM encoding units 76 _{1 to} 76 _N ADPCM-encode the analog voice signals on the respective voice lines and multiplex them for every two lines to be connected to 64 kbps.
Voice signals 78 _{1 to} 78 _N are generated. This audio signal 78
_{1 to} 78 _N are T of 64k unit TSW via the bus 73.
It is multiplexed by the SW unit 72. On the contrary, the audio signals 79 ₁ which is divided into 64kbps units TSW unit 72 to 79 _N
Is the ADPC that accommodates the corresponding CH via the bus 73.
It is input to the M encoding units 76 _{1 to} 76 _N.

FIG. 3 shows the audio signals 78 ₁ and 7 shown in FIG.
9 shows an outline of the configuration of 9 ₁ . Ie 1
32kA with analog voice signal of 32kbps per CH
The DPCM encoded audio signal b ₁ ~b ₄ only 2CH fraction consisting multiplexed "32KADPCM audio signal × 2CH" 6
It is configured as a transmission signal of 4 kbps.

Sampling units 77 _{1 to} 77 _N sample each SS line / SR line and generate ST multi-frames 80 ₁ to 80 _N with ₁ TS of 8 kbps multiplexed for each two connected lines. The ST multi-frames 80 ₁ to 80 _N are transmitted in 64 k unit TSW through the bus 73.
Are multiplexed by the TSW unit 72. On the contrary, the TSW unit 7
The ST multi-frames 81 _{1 to} 81 _N divided into 64 kbps units at 2 are input to the sampling units 77 _{1 to} 77 _N containing the corresponding CHs via the bus 73.

FIG. 4 shows an outline of the structure of 1TS of the ST multiframes 80 ₁ and 81 ₁ shown in FIG. FIG. 1A shows an outline of the structure of 1TS of ST multiframe. FIG. 2B shows an example of allocation of 1TS. That is, 1 TS of ST multi-frame is 8
It is a kbps signal, and each TS is transmitted in a cycle of 1 ms. Each TS has a multi-frame structure including a total of 8 bits including F bits indicating the beginning of a frame, SP bits that are warning bits, and 6 bits including the signaling signals of CH1 and CH2.

The TSW unit 72, in accordance with the allocation setting instructed by the control signal from the control unit 75, the audio signal 78 ₁ of "32 kbps × 2 CH" as shown in FIG.
Switching is performed in units of 64 kbps from -78 _N. As the bus signals on the bus 74, a TS is assigned in advance for each transmission path IF module, and audio signals 78 _{1 to} 78 _N are sent to each TS in units of 64 kbps by a control signal from the control unit 75. The multiplexed signal 82 thus multiplexed is “32 kADPCM 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 Of which "32kADPCM
Voice signal × 2CH × 23TS ″ multiplexed signal 83 ₁ ...
84 ₁ ... Is input.

On the other hand, the transmission line IF modules 70 ₁ ..., 7
From 1 ₁ ..., "32kADPCM audio signal x 2CH x
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 ... is "32kADPCM audio signal x 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 Turn into.

Further, the TSW unit 72 sets 1 according to the allocation setting instructed by the control signal from the control unit 75.
ST multiframe (2 where TS is the TS shown in FIG. 4)
CH) 80 ₁ to 80 _N are switched. The bus signals on the bus 74 are ST multi-frames 80 ₁ to 80 _{N in} units of 8 kbps in accordance with a control signal from the control unit 75 in the TS previously assigned to each transmission path IF module.
Is sent. Multiplexed ST multiplexed in this way
Multi-frame (2CH) 88 is "ST frame x
N ″. Each TS of the multiplexed ST multi-frame 88
Is supplied to the transmission line IF module with a TS group that has been previously allocated. For example, the transmission line IF module 70
_1, ..., 71 ₁ ..., Of the multiplexed ST multi-frames 88, the multiplexed ST multi-frames 89 _1, ..., 90 ₁ ... Of “ST multi-frame × 23 TS” are input.

On the other hand, the transmission line IF modules 70 ₁ ..., 7
From 1 ₁ ..., multiplexed ST multi-frames 91 ₁ ..., 92
₁ ... Are sent to the bus 74 at the timings respectively assigned in advance. Each transmission line IF module 70
₁ ..., multiplexed sent at different timings from 71 ₁ ... ST multiframe 91 ₁ ..., 92 ₁ ... is, "ST
Multi-frame × N ″ multiplexed ST multi-frame 93
Is input to the TSW unit 72. The TSW unit 72 is
According to the allocation setting instructed by the control signal from the control unit 75, the ST multi-frames 81 _{1 to} 81 _N
Split into.

In the transmission path IF module 70 ₁ , the bus 7
The multiplexed signals 83 ₁ ... And the multiplexed ST multiframes 89 ₁ ... Switched by the TSW unit 72 via 4 are further multiplexed and inserted into the TS on the transmission path frame in the 1.544 Mbps transmission path 67 ₁ . Or vice versa.

Similarly, the transmission path IF module 71 ₁ further multiplexes the multiplexed signal 84 ₁ and the multiplexed ST multi-frame 90 ₁ switched by the TSW unit 72 via the bus 74, and the 6.312 Mbps transmission path 68. _It is inserted in the TS on the transmission path frame in ₁ . Or vice versa.

FIG. 5 shows 1.544 Mbps shown in FIG.
6 shows an example of the structure of a transmission path frame on the transmission path 67 ₁ . FIG. 3A shows the configuration of the entire transmission path frame. FIG. 2B shows TS2 of the transmission path frame.
Only part 4 is shown in detail. Thus, 1.544M
The transmission path frame on the bps transmission path 67 ₁ has a 1-bit F bit indicating the beginning of the frame and 64 k each.
bps TS1 to TS24. Among them, TS1 to TS23 are “32kADPCM audio signal × 2CH × 23TS”, and TS24 corresponds to ST multiframe. As for the TS 24, each TS is transmitted at a cycle of 1 ms as shown in FIG. Each TS has a multi-frame configuration of 8 bits in total, which includes an F bit indicating the beginning of a frame, an SP bit that is a warning bit, and a 6-bit signaling signal for 6 CHs sequentially assigned from CH1.

The case where the audio signals input from the above-mentioned ADPCMIF module are multiplexed and inserted into the TS of the transmission path frame of the transmission path IF module 70 ₁ to the 1.544 Mbps transmission path 67 ₁ will be described in detail below.

FIG. 6 shows the I of TDM in the first embodiment.
It is a diagram showing the main configuration of the F module. However, the same parts as those of the TDM shown in FIG. Here, for convenience of description, 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 instead of 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 up bus and the down bus. That is, in this TDM, the ADPCMIF modules 69 _{1 to} 69 _N , which accommodate the voice line and the SS line / SR line corresponding thereto in units of 2CH, transmit the upstream transmission signal to the TSW unit 72 via the upstream bus 100. It transmits and receives the downlink transmission signal from the TSW unit 72 via the downlink bus 101. Since the ADPCMIF modules 69 _{1 to} 69 _N have the same configuration, only the ADPCMIF module 69 ₁ will be described below.

The ADPC MIF module 69 ₁ ADPCM-codes the analog voice signals of the voice lines 65 ₁ and 65 ₂ , and SS lines used for the SR system which is an individual line signal system provided corresponding to each voice line. / SR line signal is sampled and TSW is sent via the upstream bus 100.
It is sent to the unit 72. Or vice versa. Therefore, the ADPCMIF module 69 ₁ includes the ADPCM codec unit 102 ₁ and the 32k · 64k conversion unit 103.
₁ , a bus IF unit 104 ₁ , an ST frame generation / termination unit 105 _1, and a 1k sampling unit 106 ₁ .

The ADPCM codec section 102 ₁ outputs the analog voice signals of the voice lines 65 ₁ and 65 ₂ to the T channel for each CH.
TC standard G.I. High efficiency coding (ADPC
32kAD of 32kbps (4 bit unit) by M)
It is converted into PCM voice signals 107 ₁ and 107 ₂ . Or 3
The opposite is done for the 2k ADPCM audio signals 108 ₁ , 108 ₂ .

The 32k / 64k conversion unit 103 ₁ uses the ADP
AD code for each CH by the CM codec unit 102 ₁ .
M-coded 32 k ADPCM audio signal 107 ₁ , 1
64 channels of 64 kbps by multiplexing ₂ channels of 07 ₂
Audio signal (32kADPCM audio signal x 2CH) 109
Convert to ₁ . Or 64k audio signals from the bus IF unit 104 ₁ (32KADPCM audio signal × 2CH) 110 ₁
About vice versa.

The 1k sampling section 106 ₁ is provided for each voice line, and the signaling signals 111 ₁ , 111 ₂ obtained by sampling the SS line / SR line used for the SR system of the individual line signaling system of the exchange at ₁ kbps for each CH. To generate. Alternatively, the opposite is performed for 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
₂ channels of the signaling signals 111 ₁ and 111 ₂ generated for each CH by the k sampling section 106 ₁ are
The multi-ST frame 113 ₁ is generated and wrapped. Or, 8 multi ST frame 1 from the bus IF unit 104 ₁
14 ₁ is terminated and 2CH of signaling signal 11
Take out 2 ₁ and 112 ₂ .

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

As described above, the TSW unit 72 is a 64k unit TSW, and the ADPC of the TS of the upstream bus 100 is used.
A 9-bit parallel signal is fetched from the TS assigned to the MIF module 69 ₁ , and this is loaded onto the downstream bus 101.
Among them, in FIG. 6, it is sent to the TS assigned to the transmission path IF module 70 ₁ instructed by the control signal from the control unit (not shown). Alternatively, the TSW unit 72, on the contrary, takes in a 9-bit parallel signal from the TS assigned to the transmission path IF module 70 ₁ in the upstream bus 100, and sends it from the control unit (not shown in FIG. 6) in the downstream bus 101. ADPCMIF instructed by control signal
It is sent to the TS assigned to each module.

The transmission line IF module 70 ₁ is an ADPC.
The 9-bit parallel signal sent from each of the MIF modules 69 _{1 to} 69 _N takes in the signal switched by the TSW unit 72, multiplexes it and sends it to the 1.544 Mbps transmission line 67 ₁ as a high-speed transmission line signal. Or vice versa. Therefore, the transmission line IF module 70 ₁ includes the bus IF unit 115 ₁ , the transmission line frame generation / termination unit 116 _1, and the ST frame termination / generation unit 1.
17 ₁ and ST frame generation / termination unit 118 ₁ .

The bus IF section 115 of the transmission line IF module
₁ is a “9-bit parallel signal × N (1.544 Mbps) switched by the TSW unit 72 from a TS that is pre-allocated among the TSs of the downlink bus 101.
In the case of the transmission line IF module of the transmission line, N takes in a maximum of 23 natural numbers) "of the downstream bus signal.
"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
Comprises 2 32kADPCM audio signal, 64k audio signal 119 ₂ includes a 32kADPCM audio signal CH3 and CH4, 64k audio signal 119 _N includes 32kADPCM audio signal CH (2N-1) and CH (2N). Similarly, for example, 8 multi-ST frame 120 ₁ has CH1 and C
8 multi-ST frame 120 ₂ includes CH3 and CH4 signaling signals.
8 multi-ST frame 120 _N includes CH (2N-1) and C
H (2N) signaling signal is included. The bus IF unit 115 ₁ of the transmission path IF module, on the contrary, has a "3"
64k audio signals 121 _{1 to} 121 _N composed of 2kADPCM audio signal × 2CH ”and 8 multi-ST frames 122 ₁ to ₁ 1 each composed of“ signaling signal × 2CH ”.
22 _N is converted into an up bus signal of “9-bit parallel signal × N” and sent to the designated TS of the up bus 100.

Here, the multi-framed signal
Bus IF unit 1 to convert the ringing signal into a single frame.
15₁8 multi-ST frame 120 output from₁~ 1
20 _NIs an ST frame termination / generation unit 117₁And ST frame
Generating / terminating unit 118₁And the transmission line frame through
Forming / terminating unit 116₁Entered in.

ST frame termination / generation unit 117₁Is the
IF section 115₁8 multi-ST frame 120 from₁~
120_N, Each of which is a multiframe
CH signaling signal is extracted and CH1
~ CH (2N) extraction signaling signal 123₁~ 12
Three_2NST frame generation / termination unit 118₁Send to
It Alternatively, on the contrary, the ST frame termination / generation unit 117
₁Is an ST frame generation / termination unit 118₁CH1 from
CH (2N) signaling signal 124₁~ 124 _2NTo
8 multi-ST frames with 8 multi-frames for each 2CH
Wrapped in a room, the bus IF section 115₁Send to.

The ST frame generation / termination unit 118 ₁
Eight multi-ST frames 125 ₁ to _{1 in which} the extracted signaling signals 123 _{1 to} 123 _2N of each CH from the T frame terminating / generating unit 117 ₁ are converted into 8 multi-frames for every 6 CHs.
25 _L (L is a natural number) is generated and the transmission path frame is generated.
It is sent to the terminal unit 116 ₁ . Or ST frame generation
The terminating unit 118 ₁ is a transmission path frame generating / terminating unit 116 ₁
Signaling signals 124 _{1 to} 12 extracted for each CH from the 8 multi-ST frames 126 _{1 to} 126 _L from
4 _2N is sent to the ST frame termination / generation unit 117 ₁ .

The transmission path frame generation / termination unit 116 ₁
64k audio signal 119 _{1 to} 119 consisting of “32k ADPCM audio signal × 2CH” from the bus IF unit 115 _1.
N and 8 multi-ST frames 12 that are multi-framed for each 6CH from the ST frame generation / termination unit 118 _1.
5 _{1 to} 125 _L is 1.544 Mbps of 1.544 Mbps transmission line 67 _{1 based on} TTC standard JT-G704 and the like.
It is inserted in the TS on the ps transmission path frame. Or vice versa, from the TS on the transmission path frame of the 1.544 Mbps transmission path 67 ₁ , “32 kADPCM audio signal × 2 CH”
64k audio signals 121 _{1 to} 121 _N and 8 multi-ST frames 12 that are multi-framed for each 6CH.
6 _{1 to} 126 _L are taken out.

Next, regarding the TDM having such a configuration,
The operation when the low-speed transmission signal is multiplexed as the high-speed transmission signal will be specifically described with reference to FIGS. 7 to 12. 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 thus the description thereof is omitted.

FIG. 7 shows the ADCPM codec section and 32k.6 of the ADPCMIF module shown in FIG.
It shows an outline of the operation of the 4k conversion unit. Figure 7
(A-1) shows analog voice signals of the voice lines 65 ₁ and 65 ₂ . FIG. 7A-2 shows the ADPCM shown in FIG.
The ADPCM coded data coded by the codec section 102 ₁ is shown. FIG. 7B-1 shows an outline of the configuration of the 32kADPCM audio signal 107 ₁ . Figure 7 (b-2)
Shows the outline of the configuration of the 32 kADPCM audio signal 107 ₂ . FIG. 7B-3 shows a 32k / 64k conversion unit 103.
64k audio signal (32kADP) multiplexed by ₁
An outline of the configuration of the CM voice signal × 2CH) 109 ₁ will be shown.

In this way, the ADPCMIF module A
The DPCM codec unit 102 ₁ converts the analog voice signal shown in FIG. 7A-1 input from the voice line to 8 kHz.
By sampling at the sampling frequency of z and quantizing the sampled value into 4 bits, ADPCM voice coding of 32 kbps shown in (a-2) of the figure is generated.
As a result, for each CH, the ADPCM codec unit 102 ₁ converts the analog voice signal of the voice line 65 ₁ of CH1 into the 32 kADPCM voice signal 107 ₁ shown in (b-1) of FIG.
And the analog voice signal of the voice line 65 ₂ of CH2 is converted to the 32kADPCM voice signal 10 shown in (b-2) of FIG.
Convert to 7 ₂ . The 32k / 64k conversion unit 103 ₁ has AD
3 coded for 2CH by the PCM codec unit 102 _1.
The 2 kADPCM audio signals 107 ₁ and 107 ₂ are multiplexed to obtain 64 kps of 64 kbps as shown in FIG. 7B-3.
The audio signal 109 ₁ is generated.

FIG. 8 shows an outline of the operation of the 1k sampling section and ST frame generation / termination section of the ADPC MIF module shown in FIG. Figure 8
(A-1) shows a signal of the SS line / SR line corresponding to each voice line. FIG. 8A-2 shows the signaling signal sampled by the 1k sampling unit 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. Figure 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. 7 (b-4) shows 1 TS of 8 multi-ST frames.
The outline of is shown.

In this way, one of the ADPCMIF modules is
The k-sampling unit 106 ₁ corresponds to the S line corresponding to each voice line.
By sampling the signal of the S line / SR line at 1 kHz, the signaling signal of 1 kbps shown in (a-2) of the figure is generated. As a result, the 1k sampling unit 106
₁ is S corresponding to the voice line 65 _{1 of} CH1 for each CH.
The signal of the S line / SR line 66 ₁ is 1k shown in FIG.
The signal of the SS line / SR line 66 ₂ corresponding to the voice line 65 _{2 of} CH2 is converted into the signaling signal 111 ₁ of ₁ bps, and the signaling signal ₁ of ₁ kbps shown in (b-2) of FIG.
Convert to 11 ₂ . ST frame generation / termination unit 105
₁ is ₁ ms for the signaling signals 111 ₁ and 111 ₂ sampled for 2CH by the 1k sampling unit 106 _1.
It is accommodated in an 8-multi ST frame 113 ₁ having a cycle. Each TS of the 8-multi ST frame 113 ₁ is shown in FIG.
As shown in FIG. 3, the F bit indicating the beginning of the frame, the SP bit which is a warning bit, and the C bit are transmitted at a cycle of 1 ms.
It consists of 8 bits in total including 6 bits including the signaling signals of H1 and CH2. The SP bit is used, for example, to indicate the alarm when the other party does not detect the F bit. Since only one bit of the signaling signal of each CH is transmitted in one cycle, the transmission rate of the signaling signal remains unchanged at 1 kbps.

FIG. 9 shows an outline of the operation of the bus IF section of the ADPCMIF module shown in FIG. FIG. 9A shows the outline of the configuration of the 64k audio signal 109 ₁ . 8B shows an 8-multi ST frame 113.
An outline of the configuration of ₁ is shown. The same figure (c) shows the upstream 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 unit 104 ₁ uses the "32 kADPC
8 bits of 64 kbps 64 k voice signal 109 ₁ consisting of M voice signal × 2 CH and “signaling signal × 2
8 kbps 8 multi-ST frame 113 including CH "
₁ of the 1 bit, is converted into parallel signals of 9 bits,
It is sent 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, the TS to be transmitted is assigned in advance according to an instruction from the control unit (not shown). As a result, the transmission signal from each ADPCMIF module assigned to a different TS among the 1024 TS shown in FIG. 9C is 8.912 Mbps on the upstream bus 100.
And is supplied to the TSW unit 72.

FIG. 10 shows an outline of the operation of the TSW section 72. FIG. 1A shows an outline of the configuration of a bus signal transmitted on the upstream bus 100. The same figure (b)
Shows an outline of a configuration of a bus signal transmitted on the downlink bus 101. Here, up bus 100 and down bus 1
01 is assumed to have a transmission rate of 8.192 Mbps.

As shown in FIG. 9A, the upstream bus 100
The TS of the above bus signal is composed of 1024 TS, and each TS is assigned in advance to the ADPCMIF module or the transmission line IF module. For example, TS _A 1
30 ₁ is the ADPC MIF module 69 ₁ and TS _B 13
0 ₂ to the ADPC MIF module 69 ₂ , TS _C 130 ₃
Are respectively assigned to the ADPC MIF modules 69 _N. The 9-bit parallel signal shown in FIG. 9C is sent to the upstream bus 100 from the ADPCMIF module assigned to each TS. The upstream bus 100 has a transmission line I for dividing the transmission signal from the TSW unit 72 from the high speed side to the low speed side.
As TSs to be transmitted by the F module 70 _1, TS _{D to} TS _{D + N} 130 ₄ corresponding to _N TSs are assigned.

On the other hand, as shown in FIG.
The bus signal TS on the bus 101 also consists of 1024 TS,
Each TS is assigned in advance. Here, below
The allocation of TS of the rear bus 101 is T of the upstream bus 100.
It is assumed that the same allocation as S is made. Sanawa
Chi, TS_A131₁Is the ADPCMIF module 69
₁To TS_B131₂Is the ADPCMIF module 69
₂To TS_C131₃Is the ADPCMIF module 69
_NTo TS_D~ TS_{D + N}131_FourIs the transmission line IF module 7
0 ₁Are assigned to each.

For example, TS _A , TS _B assigned to the ADPC MIF modules 69 ₁ , 69 ₂ , 69 _N of the upstream bus 100 by a control signal from a control unit (not shown),
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.} In addition, the transmission path IF module 7 of the upstream bus 100
The data of TS _D , TS _{D + 1} , and TS _{D + N} assigned to 0 ₁ are converted to the ADPCMIF module 6 of the downstream bus 101.
9 _1, 69 _N, 69 ₂ assigned TS _A, TS _C, T
Switched to S _B.

It is not necessary to assign the same TS to the upstream bus 100 and the downstream bus 101, and the TSW unit 72 can send any TS on the upstream bus 100 to the downstream bus by a control signal from a control unit (not shown). Data can be transferred between arbitrary TSs by assigning it to any bus on the 101, but normally the same T is used to simplify the setting.
S is assigned.

The 9-bit parallel signal switched by the TSW unit 72 in this way is pre-assigned to the transmission line IF module 70 on the down bus 101 in accordance with a control signal from a control unit (not shown).
₁ is inserted in the corresponding TS.

FIG. 11 shows an outline of the operation of the bus IF section, ST frame terminating / generating section and ST frame generating / terminating section of the transmission path IF module shown in FIG. However, N is 23. FIG. 11 (a-1)
Shows an outline of a configuration of a bus signal transmitted on the downlink bus 101. FIG. 11A-2 shows “32kADPCM audio signal × 2CH separated by the bus IF unit 115 ₁ .
A downlink bus signal of × 23 ″ is shown. FIG.
“8 multi-ST separated by the bus IF unit 115 ₁
A downlink bus signal of frame (2CH) × 23 ″ is shown. FIG. 11 (b-1) shows an example of allocation of each TS of 8 multi-ST frames. FIG. 11 (b-2) is shown in FIG. 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.

The bus IF unit 115 ₁ is assigned in advance to the transmission line IF module 70 ₁ among the downlink bus signals shown in FIG. 11A-1 transmitted to the downlink bus 101 by the TSW unit 72. 23 TS TS
Take out 140 9-bit parallel signals. As shown in (a-2) and (a-3) of the figure, each parallel signal is an 8-bit “32kADPCM audio signal × 2C”.
H "and 1-bit 8 multi-ST frames are separated.
Then, a 64k audio signal 119 having 46CH (= 2CH × 23TS) of ADPCM encoded data corresponding to the frame format of the 1.544 Mbps transmission line.
_{1-119 23} is produced, also shown in FIG. (A-3) 8
Multi-ST frames 120 _{1 to} 120 ₂₃ are generated.

The ST frame terminator / generator 117 ₁ terminates the 8 multi-ST frame output from the bus IF unit 115 ₁ shown in (a-3) of FIG. 2 for each TS as shown in -1)
The CH-divided signaling signal is taken out and separated as a 1 kbps signaling signal. For example, the signaling signals S ₁ and S ₂ assigned to the _1st TS of the 8-multi ST frame 120 ₁ are shown in FIG.
-2), it is extracted as signaling signals 123 ₁ and 123 ₂ of ₁ kbps, respectively.

[0092] ST frame termination-generating unit 117 CH1～CH46 extracted in ₁ signaling signal 123 ₁
～123 ₄₆ 8 multi-ST, which is 8 multi-framed every 6CH by ST frame generation and termination unit 118 ₁
Frames 125 _{1 to} 125 ₈ are generated. For example, the 8-multi-ST frame 125 ₁ multi-frames the signaling signals of CH1 to CH6, and the 8-multi-ST frame 125 ₈ multi-frames the signaling signals of CH43 to CH46. 8 multi-ST frame ST ₁ ~
As shown in (c) of the figure, ST ₈ is transmitted in a 1 ms cycle, and is a 6-bit signal including an F bit indicating the beginning of the frame, an SP bit that is a warning bit, and a signaling signal that is sequentially allocated for every 6CH. It consists of 8 bits in total.

FIG. 12 shows an outline of the operation of the transmission path frame generation / termination unit 116 ₁ of the transmission path IF module shown in FIG. FIG. 12A shows an 8-multi S generated by the ST frame generation / termination unit 118 ₁ .
An outline of the structure of the T frame is shown. FIG. 11B shows a signaling signal contained in 8 multi-ST frames.
FIG. 11C shows the 64k audio signals 119 _{1 to} 119 ₂₃ separated by the bus IF unit 115 ₁ . The same figure (d)
Shows an outline of the structure of the transmission line format of the 1.544 Mbps transmission line 67 ₁ .

8 multi-ST frames 12 generated by the ST frame generation / termination unit 118 ₁ as described above
5 _{1 to} 125 ₈ are ST _{1 to} S ₈ as shown in FIG.
This is a multi-frame structure in which T ₈ is transmitted at a cycle of 1 ms. Signaling signals of the respective CHs are assigned to TS1 to TS8 of each ST as shown in FIG. ST ₁ ~ of such 8 multi-ST frame
The ST _8, 64k audio signal 119 ₁ to 1 consisting 23TS
It is accommodated as the 24th TS for 19 ₂₃ . And
T of transmission line frame of 1.544 Mbps transmission line 67 _1.
It is accommodated in S1 to S24, the frame bit F for the transmission path is added to the head, and it is sent to the 1.544 Mbps transmission path 67 ₁ .

Thus, 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 of the 1.544 Mbps transmission line conforming to the TTC standard JT-G704 and the like. Although the TDM to be transmitted on the line has been described, the high-speed transmission line is not limited to this. High-speed transmission line 6.312Mbp
Even in the case of the s transmission line, only the number of allocated TSs is different, and the configuration is the same as the configuration shown in FIG.
The transmission line IF module for the 2 Mbps transmission line can accommodate the transmission line format of the 6.312 Mbps transmission line which also complies with the TTC standard, for example.

FIG. 13 shows that the high speed transmission line is 6.312 Mbp.
7 shows 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 in the case of the s transmission line. However, N is 92. Therefore, 92 TS 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 the configuration of a bus signal transmitted on the downlink bus 101. FIG. 13 (a-2)
Is a "32kADPCM separated by the bus IF unit.
An audio signal × 2CH × 92 ″ downlink bus signal is shown.
3 (a-3) indicates a downstream bus signal of "8 multi-ST frames (2CH) × 92" separated by the bus IF unit. FIG. 13B-1 shows an example of allocation of each TS of 8 multi-ST frames. FIG. 13B-2 shows an outline of the configuration of the extracted signaling signal shown in FIG. FIG. 13C shows an outline of the structure of the 8-multi-ST frame shown in FIG.

The bus IF unit assigns to the transmission line IF module corresponding to the 6.312 Mbps transmission line in advance, of the downlink bus signals shown in FIG. A 9-bit parallel signal of TS150 corresponding to 92TS is taken out. In this parallel signal, each TS has (a-
2), 8-bit "32kAD as shown in (a-3)
PCM audio signal x 2CH "and 1-bit 8 multi-ST frame are separated. And, in accordance with the frame format of 6.312Mbps transmission line, 184CH (=
64k audio signals 151 _{1 to} 151 ₉₂ having ADPCM encoded data of 2CH × 92TS) are generated, and 8 multi-ST frames shown in (a-3) of the figure are generated.

The ST frame terminator / generator terminates the 8-multi-ST frame output from the bus IF section shown in (a-3) of FIG.
As shown in 3 (b-1), the signaling signal divided into 2CHs in each TS is extracted, 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 15 of CH1 to CH184 extracted by the ST frame termination / generation unit
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 shown in (c) of the figure, a total of F bits indicating the beginning of a frame, SP bits that are warning bits, and 6 bits including a signaling signal allocated in order for every 6CH are transmitted as shown in FIG. It consists of 8 bits.

FIG. 14 shows that the high-speed transmission path is 6.312 Mbp.
7 shows an outline of the operation of the transmission path frame generation / termination unit of the transmission path IF module shown in FIG. 6 in the case of the s transmission path. FIG. 14A shows an outline of the structure of 8 multi-ST frames generated by the ST frame generation / termination unit. FIG. 11B shows a signaling signal contained in 8 multi-ST frames. FIG (c) is, 64k audio signal 151 ₁ to 1 separated by the bus IF unit
51 indicates ₉₂ . FIG. 6D shows the 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 is shown in FIG.
As shown in (b), ST ₁ to ST ₃₂ have a multi-frame structure in which they are transmitted in a cycle of 1 ms. TS1 to T of each ST
As shown in (a) of the same figure, the signaling signal of each CH is assigned to S8. Like this 8
Add ST ₁ to ST ₃₂ of multi-ST frame to 64k audio signal 151 _{1 to} 151 ₉₂ consisting of ₉₂ TS
Store as S. Then, it is accommodated in TS1 to TS96 of the 6.312 Mbps transmission line, the frame bit F for the transmission line is added to the head, and the frame is transmitted to the 6.312 Mbps transmission line.

As described above, in the TDM according to the first embodiment, the voice signal and the signaling signal of the voice line and the SS line / SR line corresponding thereto are multiplexed for every 2CH by the ADPCMIF module and converted into the transmission signal of 64 kbps. After that, switching is performed in units of 64k TSW, and the data is transmitted to the high-speed transmission line of, for example, 1.544 Mbps or 6.312 Mbps.
Can be configured with only 64k unit TSW memory,
It is possible to simplify the allocation setting by the control unit.

Second embodiment

In the second embodiment, the low speed transmission path is 2.
4 kbps, 4.8 kbps, 9.6 kbps, 14.
Division multiplexing is performed between a synchronization signal having a bearer speed of 4 kbps and a bearer speed of 19.2 kbps and a high speed transmission signal on a 1.544 Mbps transmission line.

FIG. 15 shows an outline of the structure of the TDM in the second embodiment. In this TDM, transmission speeds of 2.4 kbps and 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, the bearer speed conversion unit 163 having the IF function of the synchronous data communication line is used as the 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 ...
... and have.

Further, this TDM has a TSW section 165.
The 64k unit TSW, and the 64k unit TSW memo
It consists of only Because of this, bearer speed conversion
Part 163₁~ 163_Five64 kbps universal signal
To 64 kbps with a 64 k unit TSW.
Universal by switching in units
Of data repeated according to bearer speed during signal conversion
Collect as many universal signals as CHs. So
Then, the X. Change to 50 multiframe
After the conversion, the 64k unit TSW of the TSW unit 165 is used again.
Transmission at 1.544 Mbps by multiplexing
It is inserted in an arbitrary TS of the transmission path frame on the path. But
Therefore, the TDM in the second embodiment is the bearer speed conversion.
Part 163 ₁~ 163_FiveCorresponding to each, 0th-order group conversion unit
166₁~ 166_FiveIs equipped with.

[0107] The bearer rate conversion unit 163 ₁ to 163 ₅ is a low speed side IF module, the TSW 165, are connected via a bus 167. TSW unit 165 and 0
Next-group converters 166 _{1 to} 166 ₅ and high-speed side transmission path IF
The modules 70 ₁ ... Are connected via a bus 168. Further, 0-order group conversion unit 166 _{1 to 166 5} is also connected to the bus 167. Furthermore, this TDM
Has a control unit 169, and according to a control signal, the TSW unit 1
It is possible to perform allocation setting in units of 64 kbps in 65.

[0108] bearer speed conversion section 163 _{1-163 5} each transmission rate is 2.4 kbps, 4.8 kbps,
9.6kbps, 14.4kbps, 19.2kbps
Sync signals of 3.2 kbps, 6.4 kbps, 12.
After converting into a bearer signal of 8 kbps, 19.2 kbps, and 25.6 kbps, it is further converted into 64 k universal signals 170 _{1 to} 170 ₅ of 64 kbps. Or vice versa, 64k universal signals 171 _{1 to} 171 ₅ .
2 kbps, 6.4 kbps, 12.8 kbps, 1
After converting to a bearer signal of 9.2 kbps, 25.6 kbps, further 2.4 kbps, 4.8 kbps, 9.6
It is converted into synchronization signals of kbps, 14.4 kbps, and 19.2 kbps.

FIG. 16 shows an outline of the structure 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
Convert the ps sync signal to a bearer speed of 3.2 kbps
Then, convert it to the 64k universal signal shown in Fig. 16.
Repeat the same data 20 times. Bearer speed converter 16
Three₂Is a 4.8 kbps synchronization signal of 6.4 kbps
After converting to bearer speed, 64k universal shown in Fig. 16
The same data is repeated 10 times after being converted into a monkey signal. Be
Ara speed conversion unit 163 ₃Is a synchronization signal of 9.6 kbps
16 to the bearer speed of 12.8 kbps,
The same data converted to the 64k universal signal shown in
Repeat 5 times. Bearer speed converter 163_FourIs 14.
Sync signal of 4 kbps, bearer speed of 19.2 kbps
64k universal signal shown in Fig. 16 after conversion to
And the same data is repeated 3 or 4 times. Bear
LA speed conversion unit 163_FiveIs a synchronization signal of 19.2 kbps
16 to the bearer speed of 25.6 kbps,
The same data converted to the 64k universal signal shown in
Repeat 2 or 3 times.

The TSW unit 165 follows 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 universal signal 172 ₁ of “64k universal signal × 20CH”. Or, conversely, a 64k universal signal x 20CH 64k multiplexed signal 173 ₁
6 for 20CH which is a bearer signal at 3.2 kbps
It is divided into 4k universal signals 171 ₁ . Hereinafter, similarly, the TSW unit 165 determines the 64k multiplexed signals 172 _{2 to} 17 _2.
Produces ₂₅ . Or vice versa, 64k multiplexed signal 17
3 _{2-173 5} divides the.

The 0th-order group conversion units 166 _{1 to} 166 ₅ are connected to the bus 1
68 from the 64k multiplexed signals which are CH multiplexed respectively. Generates 50 multi-frame 0th order group signals and 64
and it sends the k transmission line 174 _{1 to 174 5.} Or vice versa.

FIG. 17 shows such X. It is a diagram showing the outline of the configuration of a 0th-order group signal of 50 multiframes.
X. The 50 multi-frame has an 8-bit structure that is transmitted at 64 kbps, and includes a leading 1-bit F bit, D _{1 to} D ₆ where transmission data is inserted, and a trailing 1-bit S bit. Consists of. These F bits, D ₁
To D _6, S bits are transmitted by 2.5ms period, so as to insert a predetermined pattern in accordance with the frame number for the F bit first. The first A-bit inserted into the F-bit is an alarm bit that can be used to discriminate abnormal or normal time. In subsequent frames, "1", "1", "0", ... Are inserted in order. Indicates that The last S bit is a control bit and is used for various controls. Data of CH to be inserted is assigned to 6 bits of D _{1 to} D ₆ according to the frame number for each type of bearer speed, for example, 3.
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 bearer speed type.
The following group conversion unit 166 _{1 to 166 5} is connected to the bus 167, generated X. Fifty multiframes are folded and supplied again to the TSW unit 165. Alternatively, on the contrary, the X.X output from the TSW unit 165 is output. 50 multi-frames are 0th-order group conversion units 166 _{1 to} 16
Is supplied to 6 _5, it is converted into 64k multiplexed signal.

The X.3 generated by the 0th-order group conversion units 166 _{1 to} 166 ₅ . For the 50 multi-frame, the TSW unit 165 generates a multiplexed multi-frame 175 multiplexed into “X.50 multi-frame × 24” according to the allocation setting instructed by the control signal from the control unit 169, and the transmission line 1.544Mb at the IF module 164 ₁
It is inserted into the TS on the transmission path frame in the ps transmission path 162 ₁ . Or vice versa.

FIG. 18 shows the 1.544 Mbps transmission line 16
2 shows an outline of the transmission path frame structure in 2 ₁ . In this way, "X.50 multiframe x 24"
The multiplexed multi-frame 175 that is multiplexed into the TS is inserted into each TS of the 24 TSs, accommodated in any TS of the transmission path frame of the 1.544 Mbps transmission path 162 ₁ , and the frame bit F for the transmission path is added to the beginning. It is sent to the 1.544 Mbps transmission line 162 ₁ .

Thus, the TDM in the second embodiment is
Converts a low speed synchronization signal of various transmission speeds to a bearer speed to generate a universal signal of 64 kbps unit,
Once multiplexed with 64k unit TSW, 0-order group conversion is performed,
Further, since the data is folded back and multiplexed by the 64k unit TSW, only 64k unit TSW memory has a capacity of, for example, 1.5.
It can be multiplexed and transmitted on a high-speed transmission line of 44 Mbps.

Third Embodiment

In TDM according to the third embodiment, a coded signal obtained by coding a voice signal of a voice line as a low speed transmission line with high efficiency of 16 kbps and 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 structure of the TDM in the third embodiment. This TDM includes voice lines 180 _{1 to} 180 with 4N channels on the low-speed transmission line side.
SS line / SR line 181 ₁ corresponding to _4N and each voice line
~ 181 _4N is connected, and the high speed transmission line side is 1.544M
bps transmission line 182 ₁ ... and 6.312 Mbps transmission line 1
83 ₁ ... And are connected. In the TDM, as IF module, and the high efficiency coding IF module 184 ₁ ~184 _N having the IF function voice lines in 4CH units,
Transmission line IF modules 185 ₁ ... 186 ₁ ... Having an IF function between 1.544 Mbps and 6.312 Mbps transmission lines, respectively.

Further, this TDM is composed of only a 64k unit TSW memory for performing switching in units of 64kbps, and the TSW unit 1 functioning as a 64k unit TSW.
Equipped with 87. Each low speed side IF module 184 ₁
.About.184 _N and the TSW unit 187 are connected via a bus 188. The TSW unit 187 and the high-speed side IF modules 185 _1, ..., 186 _1, ... Are connected via a bus 189.

Furthermore, this TDM is based on the control unit 190.
64 in the TSW unit 187 according to the control signal.
Allocation settings can be made in units of kbps.

[0123] high-efficiency coding IF module 184 ₁ to 1
84 _N are high-efficiency coding units 191 _{1 to} 191 respectively.
1k corresponding to _N and SS line / SR line used for SR system which is an individual line signal system provided for each voice line
The sampling units 192 _{1 to} 192 _N are provided.

The high-efficiency coding units 191 _{1 to} 191 _N sample analog voice signals on each voice line at 8 kHz, convert them into high-efficiency coded voice signals quantized with 2 bits, and are respectively connected to 4 64k multiplexed for each line
bps voice signals 193 _{1 to} 193 _N are generated. The audio signals 193 _{1 to} 193 _N are transmitted via the bus 188 to 64
It is multiplexed by the TSW unit 187 of k unit TSW. On the contrary, the voice signals 194 _{1 to} 194 _N divided by the TSW unit 187 into units of 64 kbps are input to the high efficiency encoding units 191 _{1 to} 191 _N containing the corresponding CHs via the bus 188.

FIG. 20 shows an outline of the structure of such a 64 kbps audio signal. That is, the voice signals 193 _{1 to} 193 _N and 194 _{1 to} 194 _N are analog voice signals sampled at 8 kHz, converted into high-efficiency coded voice signals quantized with 2 bits, and multiplexed every 4 lines to 64 kbps. Is audio data. Therefore, if the audio signal 193 _1, voice circuit 180 _{1-180
When 4} are CH1 to CH4, each CH2 bit is a total of 8 bits of a 64 kbps transmission signal.

1k sampling section 192₁~ 192_NIs
The SS line / SR line corresponding to each voice line is sampled at 1 kHz.
Pulling and multiplexing for each 4 lines connected
ST Multi Frame 195₁~ 195_NTo generate. This
ST Multiframe 195 ₁~ 195_NThe bus 188
Via the TSW unit 187 of 64k unit TSW
To be done. On the contrary, in the TSW unit 187, 64 kbps unit
ST multiframe 196 divided into₁~ 196
_N1k, which accommodates the corresponding CH via bus 188
Sampling unit 192₁~ 192_NEntered in.

FIG. 21 shows an outline of the structure of one TS of such ST multiframe. FIG. 1A shows an outline of the structure of 1TS of ST multiframe. FIG. 2B shows an example of allocation of 1TS.
That is, 1 TS of ST multi-frame is 8 kbps.
Signal, and each TS is transmitted at a cycle of 1 ms. Each T
S has a multi-frame structure of 8 bits in total, which is an F bit indicating the beginning of the frame, an SP bit that is a warning bit, and 6 bits including the signaling signals of CH1 to CH4.

The TSW unit 187 operates according to the allocation setting instructed by the control signal from the control unit 190.
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. As for the bus signal on the bus 189, a TS is assigned in advance for each transmission path IF module, and a voice signal is sent to each TS in units of 64 kbps by a control signal from the control unit 190. The multiplexed signal 197 thus multiplexed
Is “16k coded audio signal × 4CH × N”. The multiplexed signal 197 is supplied to the transmission path IF module to which the TS is assigned in advance. For example, the transmission path IF modules 185 ₁ ... 186 ₁ ... Respectively include “16k encoded voice signal × 4CH × 22” in the multiplexed signal 197.
The TS multiplexed signals 198 ₁ ... 199 ₁ ... Are input.

On the other hand, the transmission line IF module 185 _1, ...,
186 ₁ ... from, "16k encoded audio signal × 4CH ×
22TS ″ multiplexed signals 200 ₁ ..., 201 ₁ ... At the timings respectively assigned in advance to the bus 189.
Sent to. Each transmission line IF module 185 ₁ ... 1
The multiplexed signals 200 ₁ ..., 201 ₁ ... That are transmitted from the 86 _{1 at} different timings are input to the TSW unit 187 as a multiplexed signal 202 of “16k coded voice signal × 4CH × N”. The TSW unit 187 includes a control unit 190.
This is divided into audio signals 194 _{1 to} 194 _N according to the allocation setting instructed by the control signal from.

Further, the TSW unit 187 switches the ST multi-frame (4CH) 195 _{1 to} 195 _N in which 1TS is the TS shown in FIG. 21, according to the allocation setting instructed by the control signal from the control unit 190. . The bus signal on the bus 189 is previously transmitted through the transmission line 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 thus multiplexed is “ST frame × N”. Each TS of the multiplexed ST multi-frame 203 is a TS
The groups are provided to pre-assigned transmission line IF modules. For example, the transmission line IF module 185 _1, ...
186 ₁ ... In each of the multiplexed ST multi-frame 2
Of ST 03, “ST multi-frame × 22 TS” multiplexed ST multi-frames 204 ₁ ..., 205 ₁ ... Are input.

On the other hand, the transmission line IF module 185 _1, ...,
186 ₁ ... From the multiplexed ST multi-frame 206
₁ ..., 207 ₁ ... Are sent to the bus 189 at the timings respectively assigned in advance. Each transmission line IF module 185 ₁ ..., multiplexed sent at different timings from 186 ₁ ... ST multiframe 206
₁ ..., 207 ₁ ... Are input to the TSW unit 187 as “ST multiframe × N” multiplexed ST multiframe 208. The TSW unit 187 divides this into ST multi-frames 196 _{1 to} 196 _N according to the allocation setting instructed by the control signal from the control unit 190.

In the transmission path 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.
4 ₁ is further multiplexed, and 1.544 Mbps transmission line 1
It is inserted in the TS on the transmission path frame at 82 ₁ . Or vice versa.

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

FIG. 22 shows 1.544 Mb shown in FIG.
It shows an example of a structure of a transmission path frame in the ps transmission path 182 ₁ . FIG. 3A shows the configuration of the entire transmission path frame. The figure (b) shows in detail only the portions of TS23 and TS24 of the transmission path frame. As described above, the transmission path frame on the 1.544 Mbps transmission path 182 ₁ is composed of 1-bit F bit indicating the beginning of the frame and TS1 to TS24 of 64 kbps. Of these, TS1 to TS22 are
“16k coded audio signal × 4CH × 22TS”,
TS23 and TS24 correspond to ST multiframe. As for TS23 and TS24, each TS is transmitted at a cycle of 1 ms as shown in FIG. Each TS has a multi-frame configuration of 8 bits in total, which includes an F bit indicating the beginning of a frame, an SP bit that is a warning bit, and a 6-bit signaling signal for 6 CHs sequentially assigned from CH1.

Thus, the TDM in the third embodiment is
When an analog voice signal of a voice line is encoded at 16 kbps, it generates a 64 k voice signal multiplexed for every 4 CH, and a corresponding signaling signal is also multi-framed for every 4 CH into a transmission signal of 64 kbps. Since the data is converted and multiplexed in the 64k-unit TSW memory, only 1.
It can be multiplexed and transmitted on a high-speed transmission line such as 544 Mbps.

Modification

In the TDM of the third embodiment, the analog voice signal of the voice line as the low speed transmission line is 16 kbp.
High-efficiency coding is performed to obtain 1.544 Mbps or 6.31.
Although division and multiplexing are 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 of this modified example, an analog voice signal of a voice line as a low speed transmission line is subjected to 8 kbp high efficiency coding to obtain 1.544 Mbps or 6.312.
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 structure of the TDM in this modification. TDM in this modification
Is a voice line 210 _{1 with} 8N channels on the low speed transmission line side.
˜210 _8N and SS / SR lines 211 _{1 to} 211 _8N corresponding to each voice line are connected, and 1.
544 Mbps transmission line 212 ₁ ... and 6.312 Mbps
The transmission paths 213 ₁ ... Are connected. In the TDM of this modification, as the IF modules, high-efficiency coding IF modules 214 _{1 to} 214 _N having an IF function of a voice line in units of ₈ CH, 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.

Furthermore, the TDM in this modification is 64 k.
64k unit TS for switching in bps unit
The TSW unit 217 that includes only the W memory and functions as the 64k unit TSW is provided. The low speed side IF modules 214 _{1 to} 214 _N and the TSW unit 217 are connected to the bus 21.
8 are connected. The TSW unit 217 and the high-speed side transmission line IF modules 215 ₁ ... 216 ₁ ...
It is connected via a bus 219.

Furthermore, the TDM in this modification is
The control unit 220 is provided, and the TSW unit 217 is operated by the control signal.
The allocation setting can be performed in units of 64 kbps.

[0141] high-efficiency coding IF module 214 _1-2
14 _N are high-efficiency coding units 221 _{1 to} 221 respectively.
1k corresponding to _N and SS line / SR line used for SR system which is an individual line signal system provided for each voice line
The sampling units 222 _{1 to} 222 _N are provided.

The high-efficiency coding units 221 _{1 to} 221 _N sample analog voice signals on each voice line at 8 kHz, quantize them into 1 bit, convert them into high-efficiency coded voice signals of 8 kbps, and connect them respectively. 64 kbps voice signals 223 _{1 to} 223 _N multiplexed for every 8 lines are generated. The audio signals 223 _{1 to} 223 _N are multiplexed by the TSW unit 217 of the 64k unit TSW via the bus 218. On the contrary, the audio signals 224 _{1 to} 224 _N divided by the TSW unit 217 into units of 64 kbps are transferred to the bus 218.
High-efficiency coding unit 221 that accommodates the corresponding CH via
_{1 to} 221 _N is input.

FIG. 24 shows an outline of the structure of such a 64 kbps audio signal. That is, the voice signals 223 _{1 to} 223 _N and 224 _{1 to} 224 _N are analog voice signals sampled at 8 kHz, quantized with 1 bit, high-efficiency coded, and multiplexed every 8 lines.
It is audio data of kbps. Therefore, the audio signal 2
In the case of 23 ₁ , each of the voice lines 210 _{1 to} 210 ₈ is C.
If H1 to CH8, each CH1 bit is a total of 8 bits, that is, a 64 kbps transmission signal.

1k sampling section 222₁~ 222_NIs
The SS line / SR line corresponding to each voice line is sampled at 1 kHz.
Pulling and multiplexing every 8 lines connected
ST multi frame 225₁~ 225_NTo generate. This
ST multi-frame 225 ₁~ 225_NThe bus 218
Via the TSW unit 217 of 64k unit TSW
To be done. On the contrary, the ST divided by the TSW unit 217
Multi-frame 226 ₁~ 226_NVia bus 218
Then, the 1k sampling unit 222 that accommodates the corresponding CH
₁~ 222_NEntered in.

FIG. 25 shows an outline of the structure of such 1TS of ST multiframe. FIG. 1A shows an outline of the structure of 1TS of ST multiframe. FIG. 2B shows an example of allocation of 1TS.
That is, 1 TS of ST multi-frame is 8 kbps.
Signal and each TS is transmitted in a cycle of 1.25 ms. Each TS has a multi-frame configuration including a total of 10 bits including F bits indicating the beginning of a frame, SP bits that are warning bits, and 8 bits including signaling signals of CH1 to CH8.

Similar to the TSW unit 187 in the third embodiment, the TSW unit 212 performs switching according to the allocation setting instructed by the control signal from the control unit 220. The multiplexed signal 227 obtained by multiplexing the 64k voice signals 223 _{1 to} 223 _N is “8k coded voice signal × 8CH.
The signal of each TS of the multiplexed signal 227 is supplied to the transmission path IF module to which the TS is assigned in advance. For example, the transmission path IF module 215 _1, ...
216 ₁ ... Retains “8” in the multiplexed signal 227.
k-coded voice signal × 8CH × 21TS ″ multiplexed signal 2
28 ₁ ... 229 ₁ ... are input.

On the other hand, the transmission line IF module 215 _1, ...,
From 216 ₁ ..., “8k coded voice 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 the multiplexed signal 232 of 8CH × N ″, the TSW unit 21
Input to 7. The TSW unit 217 follows the allocation setting instructed by the control signal from the control unit 220.
This is divided into audio signals 224 _{1 to} 224 _N.

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

On the other hand, the transmission line IF module 215 _1, ...,
216 ₁ ... From the multiplexed ST multi-frame 236
₁ ... 237 ₁ ... Are sent to the bus 219 at the timings respectively assigned in advance. Each transmission line IF module 215 ₁ ..., multiplexed sent at different timings from 216 ₁ ... ST multiframe 236
₁ ... 237 ₁ ... Are input to the TSW unit 217 as “ST multi-frame × N” multiplexed ST multi-frame 238. TSW section 217 divides this into ST multi-frames 226 _{1 to} 226 _N according to the allocation setting instructed by the control signal from control section 220.

Transmission line IF module 215₁216
₁Switches on the TSW unit 217 via the bus 219.
Multiplexed signal 198₁199₁And multiplexing ST
Multi-frame 204₁, 205₁Is further multiplexed,
1.544 Mbps transmission line 212 ₁And 6.312M
bps transmission line 213₁On the transmission line frame in
To insert. Or vice versa.

FIG. 26 shows 1.544 Mb shown in FIG.
ps transmission line 212₁Of transmission line frame configuration in
This is an example. The figure (a) shows the transmission line frame.
The structure of the whole system is shown. FIG. 2B shows the transmission line frame
Details of only the part where the ST multi-frame is inserted
Show. In this way, the 1.544 Mbps transmission line 212 ₁
The transmission line frame in
Bit F bit and 64 kbps multiplexed signal and multiplexed
It is composed of TS with ST multiframe inserted.
There is. Of these, TS1 to TS21 are “8k encoded sounds.
Voice signal x 8CH x 21TS ", the rest is multiplexed ST
Corresponds to multi-frame. This remaining TS is the same figure
As shown in (b), each TS is transmitted in a 1.25 ms cycle.
Be done. Each TS has an F bit indicating the beginning of the frame and an alarm
1-bit F / A bit in which for-use bits are alternately inserted
And 9 bits for 9CH allocated sequentially from CH1
And a signaling signal of 10 bits in total.
It has a multi-frame structure.

As described above, in the TDM according to the present modification, although the transmission speed of the encoded audio signal is different, as in the third embodiment, the low-speed side IF module and the high-speed side IF module have a frame structure. By devising, even if the voice signal is high-efficiency coded at 8 kbps, 6
For example, 1.544 Mbps with only 4k unit TSW memory
It is possible to multiplex and transmit to such a high speed transmission line.

[0153]

As described above, claim 1 or claim
According to the invention of item 2 , the low-speed transmission line interface means and the high-speed transmission line interface means convert the transmission signal of the low transmission speed to be multiplexed into the higher transmission speed, or vice versa. , The TSW part, which is an essential function of the TDM, can be configured only by the converted transmission rate unit, so that the conventional TDM that freely allocates by the complicated memory configuration of the TSW part
The circuit scale can be reduced as compared with. Further, since it is only necessary to set the TSW allocation for the same transmission rate unit, it is possible to reduce the complexity of the TSW setting.

[0154]

Further, according to the invention of claim 3 or claim 4 , as the transmission signal of the low-speed transmission path, the high-efficiency coded voice signal and the signaling signal of the individual signaling system with the exchange are set in the device. By converting to the first or third transmission rate with, even in TDM that is generally division-multiplexed at 64 kbps, only 64 k unit TSW
It is possible to perform division multiplexing between the high speed transmission line and the transmission line.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing 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 the first embodiment in which division multiplexing is performed between a voice line as a low speed transmission line and a high speed transmission line.

FIG. 3 is an explanatory diagram showing an outline of a configuration of an audio signal in the first embodiment.

FIG. 4 is one of ST multi-frames in the first embodiment.
It is explanatory drawing which shows the outline | summary of a structure of TS.

FIG. 5 is an explanatory diagram showing an example of a configuration of a transmission path frame in a 1.544 Mbps transmission path in the first embodiment.

FIG. 6 is a block diagram showing a main configuration part of an IF module of TDM in the first embodiment.

FIG. 7 is an ADCPM codec unit and 32k · 64k of the ADPCMIF module according to the first embodiment.
It is explanatory drawing which shows the outline | summary of operation | movement of a conversion part.

FIG. 8 is a block diagram illustrating a 1k sampling unit and an ST frame in the ADPCMIF module according to the first embodiment.
It is explanatory drawing which shows the outline | summary of operation | movement of a termination part.

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

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

FIG. 11 is a diagram illustrating a bus IF unit, an ST frame termination / generation unit, and an S in the transmission line IF module according to the first embodiment.
It is explanatory drawing which shows the outline | summary of operation | movement of a T frame production | generation / termination part.

FIG. 12 is an explanatory diagram showing an outline of the operation of a transmission path frame generation / termination unit of the transmission path IF module in the first embodiment.

FIG. 13 is a diagram showing a bus IF unit of the transmission path IF module when the high-speed transmission path is a 6.312 Mbps transmission path;
It is explanatory drawing which shows the outline | summary of operation | movement of a frame termination / generation part and ST frame generation / termination part.

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

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

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

FIG. 17 shows the X. It is explanatory drawing which shows the outline | summary of a structure of 50 multi-frames.

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

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

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

FIG. 21 is an explanatory diagram showing an outline of the configuration of 1TS of ST multiframe in the third embodiment.

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

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

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

[FIG. 25] 1T of ST multi-frame in this modification
It is explanatory drawing which shows the outline of a structure of S.

FIG. 26 is an explanatory diagram showing an example of a configuration of a transmission path frame of a 1.544 Mbps transmission path 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 the configurations of a conventional 32kADPCM audio signal and 64k audio signal.

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

[Fig. 30] Fig. 30 is an explanatory diagram showing an outline of the configuration of a conventional ST multiframe.

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

FIG. 32: Conventional X. It is explanatory drawing which shows the outline of a structure of the frame transmitted by 50 multi-frames.

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

[Explanation of symbols]

60 ₁ ... Low speed side IF module 61 ₁ ..., 62 ₁ ..., 70 ₁ ..., 71 ₁ ... Transmission line IF module 63, 72 TSW section 65 _{1 to} 65 _2N voice line 66 _{1 to} 66 _2N SS line / SR line 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 multi-frames 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 (4)

(57) [Claims] 1. A second transmission signal having a second transmission rate higher than the first transmission rate by multiplexing a first transmission signal having a first transmission rate for each first channel number. A multiplexing unit for generating and a first multi-frame that multi-frames a third transmission signal having a third transmission rate transmitted and received corresponding to the first transmission signal for each of the first channel numbers. Low-speed transmission line interface including a converting unit and a parallel converting unit that parallel-converts the second transmission signal generated by the multiplexing unit and each frame converted into the multiframe by the first multiframe converting unit. Means, time switching means for switching the parallel data converted by the parallel conversion means to the second transmission rate unit, and the time switching means Separation means for separating the second transmission signal and each of the multi-framed frames from the hatched parallel data, and the data of each frame separated by the separation means is converted to the third transmission rate. After that, second multi-frame forming means for forming multi-frames for each second channel number larger than the first channel number, the second transmission signal separated by the separating means, and the second multi-frame And a high-speed transmission line interface means including a time slot inserting means for multiplexing the multi-frame data multi-framed by the converting means and inserting it into a predetermined time slot. 2. Transmission inserted in a predetermined time slot
A first transmission signal having a first transmission rate from the signal and a first transmission signal;
Multi-frames for each number of channels
Means for extracting the system data and the extracting means.
The multi-frame data extracted by
A second transmission having a second transmission rate lower than the transmission rate
A second number less than the first number of channels after being converted to a signal
Multi-frame that multi-frames for each number of channels
And a first unit extracted by the extracting unit.
Of the transmission signal and the multi-frame conversion means
Convert each framed frame into parallel data
Parallel transmission means for
Source means and the parallel data converted by this parallel conversion means.
Time for switching the data to the first transmission rate unit.
Switch means and the switch switched by the time switch means.
The first transmission signal and
Each frame multi-framed by ramming means
And a separation means for separating the
The transmitted first transmission signal for each of the second number of channels
Has a third transmission rate lower than the first transmission rate
Dividing means for dividing into a third transmission signal, and said separating means
Each said multi-framed separated by means
The frame data is transmitted to the second channel for each of the second channels.
Second transmission speed transmitted / received corresponding to the transmission signal of
Frame conversion for converting into a second transmission signal having
And a low-speed transmission line interface means including the means . 3. The first transmission signal is high efficiency coded.
Is a voice signal, and the third transmission signal is signaling
The time division multiplexing apparatus according to claim 1, wherein the time division multiplexing apparatus is a signal. 4. The third transmission signal is high efficiency encoded.
Voice signal, and the second transmission signal is signaling
The time division multiplexing apparatus according to claim 2, wherein the time division multiplexing apparatus is a signal.