JP3507283B2 - Multi-frame conversion method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remote multiplex transmission apparatus each accommodating a plurality of analog subscribers and ISDN subscribers scattered at remote locations, an analog subscriber exchange, and an ISDN subscriber. The present invention relates to a multi-frame conversion method for a supervisory / control signal on an SG channel in a subscriber allocating device which is installed between each of the private branch exchanges as a part of the subscriber allocating device. The upstream / downstream SG channel of the configuration has a predetermined multiframe configuration of the upstream / downstream S channel regardless of the analog / ISDN subscriber type.
The present invention relates to a multiframe conversion method for converting into a G channel.

[0002]

2. Description of the Related Art In FIG. 7, a plurality of analog subscribers and ISDN subscribers scattered in a remote place are temporarily accommodated in a remote multiplex transmission device, and further, for analog subscribers via a subscriber distribution device. An example of the configuration of a transmission / switching system according to the prior art is shown for accommodating in an exchange or an exchange for ISDN subscribers. In this case, an analog subscriber and an ISDN subscriber from a remote multiplex transmission device are provided. The supervisory signal according to the above is converted into a 4-multiframe structure on the subscriber distribution device without depending on the type of the subscriber, and then the switch for analog subscribers or I
It has to be sent to the SDN subscriber switch.

The configuration of the transmission / switching system will be described more specifically with reference to FIG. 7. Analog (hereinafter simply referred to as A) subscribers (terminals) 1 scattered at a remote location are A When it is required to be accommodated in the subscriber exchange 5, or ISDN (hereinafter simply referred to as I) subscribers (terminals) 2 which are also scattered in a remote place are accommodated in the I subscriber exchange 6. If necessary, the A subscriber 1 and the I subscriber 2 are once accommodated in the nearest remote multiplex transmission device (hereinafter, simply referred to as a transmission device) 3, and further, a subscriber distribution device (hereinafter, simply referred to as a distribution device). It is housed in the exchange 5 for A subscribers or the exchange 6 for I subscribers via a device 4). Incidentally, the transmission device 3 is installed in the user building or outside the office, but the distribution device 4, the A subscriber exchange 5, and the I subscriber exchange 6 are installed in the station building.

Now, as for the transmission device 3, the transmission device 3 is described in the document "A / I subscriber line terminal equipment for optical subscriber multiplex transmission system (" NTT R & D Vol 1.40 No.
In accordance with the method disclosed in "61991") ", a plurality of A / I subscribers are accommodated as mixed and the transmission device 3
(Uplink) time division multiplex transmission line 30 from the distribution device 4 to the distribution device 4
Above, subscriber signals for A subscribers (voice signals on the B channel and supervisory signals on the SG channel) and subscriber signals for I subscribers (voice signals on the B (B1, B2) channels, The supervisory signal on the SG channel and the data signal on the D channel) are transmitted as a time-division multiplexed frame. On the other hand, the distribution device 4 accommodates a plurality of transmission devices 3, and according to the method disclosed in the document “Distribution device for subscriber system promoting development of optical access network (“ NTT technology journal 1995.5 ”)”. , (Upstream) time-division multiplex transmission line 30, the A-subscriber signal and the I-subscriber signal are separated from each other. It is distributed to the I subscriber exchange 6.

The subscriber signal frame format on the (upstream) time division multiplex transmission line 30 will be described with reference to FIG. 8. Generally, an exchange is used to monitor and control the subscriber line and the subscriber status. The SG channel is defined as an 8-bit unit (1 time slot) in an 8 kHz period (1 frame) per subscriber.
However, as shown in the figure, the uplink SG channel for monitoring the A subscriber is non-multiframe, that is,
Even if 8 bits as one multi-frame 23 are necessary and sufficient, 8 bits are not sufficient as an upstream SG channel for monitoring I subscribers, and an upstream SG channel for 3 frames is 1 unit, that is, 3 Multi-frame 18
It is configured as. On the other hand, on the (downlink) time division multiplex transmission line 30, the downlink SG channel for controlling the subscriber A is 3 multiframes 28, and
The downlink SG channel for controlling the I subscriber is also configured as 3 multiframes 25.

As described above, since the multiframe structure of the upstream SG channel is different for each of the A subscriber and the I subscriber, the distribution device 4 receives them from the (upstream) time division multiplex transmission line 30. When the subscriber signal is distributed to the A subscriber exchange 5 or the I subscriber exchange 6 according to the subscriber type, the multi-frame configuration of the upstream SG channel for each of the A subscriber and the I subscriber is as follows. It was necessary to convert into a 4-multiframe structure common to A subscribers and I subscribers. Up to now, in the upstream signal processing unit 7 on the distribution device 4, the time-division multiplexing A / from the (upstream) time-division transmission line 30 is transmitted.
The I-subscriber signal has its upstream SG channel separated by the B / SG separation circuit, and the A-subscriber of the A-subscriber multi-frame conversion circuit and the I-subscriber multi-frame conversion circuit provided for the subscriber is added. An upstream SG channel for a subscriber is converted to a 4-multiframe configuration by its A subscriber multiframe conversion circuit, while that for an I subscriber is converted to a 4-multiframe configuration by its I subscriber multiframe conversion circuit. It is a thing. Although not described in detail in the above description, such a situation is caused by the downlink S.
The same applies when the G channel is converted from the 4-multiframe configuration to the 3-multiframe configuration.

[0007]

However, in the case of the multiframe conversion method according to the above-mentioned prior art, it is not depending on the subscriber type, but for each of the upstream SG channel and the downstream SG channel, it corresponds to the subscriber for A subscribers and I subscribers. One multi-frame conversion circuit is required. For example, a maximum of 128 subscribers can be accommodated by allowing A subscribers and I subscribers to be mixed in each transmission device, and in order to easily deal with the subsequent mutual change of the subscriber type, the transmission in the distribution device is performed. 128 A-subscriber multiframe conversion circuits and 128 I-subscriber multiframe conversion circuits were required on the device-compatible upstream signal processing section. Therefore, for example, assuming that the distribution device accommodates as many as 512 transmission devices, it is inevitable that the proportion of the multi-frame conversion circuit in the total cost of the distribution device will inevitably increase. / The fact is that the downlink SG channel multi-frame conversion cannot be economically performed.

The object of the present invention is to make the
When the multi-frame conversion of the downlink SG channel is performed, the A-subscriber multi-frame conversion circuit and the I-subscriber multi-frame conversion circuit are not required for the subscribers.
It is an object to provide a multi-frame conversion method capable of economically performing multi-frame conversion.

[0009]

SUMMARY OF THE INVENTION Basically, the above-mentioned object is achieved on the distribution device by the transmission device from the transmission device, which is an uplink n multiframe-structured analog subscriber-compatible SG channel or uplink m ( > N) The ISDN subscriber-supporting SG channel having a multi-frame structure is exchanged via the subscriber-corresponding buffer memory to an analog subscriber exchange or I
The SD channel to the SDN subscriber exchange is converted into an SG channel of k (> m) multiframe structure, while the analog subscriber exchange or the SG channel of the downlink k multiframe structure from the ISDN subscriber exchange is the subscriber. Through the corresponding buffer memory, a downlink m multiframe-structured analog subscriber-compatible SG channel or a downlink m-multiframe-structured ISDN subscriber-compatible SG channel
It is achieved by being converted into a channel.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION One embodiment of the present invention will be described below with reference to FIGS. 1 to 6, assuming that the ISDN user / network interface is a basic interface. First, the structure of a transmission / switching system including a distribution device according to the present invention will be described. FIG. 1 shows the structure as an example. Now, the substantial difference of this configuration from that shown in FIG. 7 is required in the configuration of the upstream / downstream signal processing section on the distribution device 4. As shown in the figure, up to now, the upstream / downstream signal processing unit on the distribution device 4 has a subscriber-specific A-subscriber and an I-subscriber subscriber in consideration of a change in subscriber type. 1 multiframe conversion circuit
Although required, according to the present invention, for A subscriber, I
Only one A / I subscriber multi-frame conversion circuit 12 that can be used for subscribers is provided as directly related to the present invention.

Before specifically describing the A / I subscriber multi-frame conversion circuit 12, a supplementary description of the subscriber signal frame format on the (upstream) time division multiplex transmission line 30 will be given below. As shown in Figure 8, (up)
A maximum of 12 units from the transmission device 3 on the time division multiplex transmission line 30.
With the subscriber signals for eight subscribers set in a predetermined manner on the frame (the frame signal F is set at the frame start position), the frames are transmitted at a cycle of 8 kHz. In this case, the subscriber signal for one subscriber is composed of four consecutive time slots, and for the I subscriber, the B1, B2, D, and SG channels are used, and for the A subscriber, the B and SG channels are used. It is composed of empty channels. In the case of such channel setting, the I subscriber becomes the A subscriber, and
On the contrary, the A subscriber can easily deal with the change of the subscriber type such as the I subscriber, and the new empty A subscriber or I subscriber can also be used in the continuous four time slots. Can be accommodated arbitrarily. By the way,
To specifically explain the change of the subscriber type, for example, assuming that a subscriber who is currently registered as an A subscriber has a new service changed as an I subscriber, the accommodation of the subscriber on a frame is performed. Since it is not necessary to change the position, the subscriber circuit package for the subscriber mounted on the transmission device 3 is exchanged from the A subscriber to the I subscriber and, on the distribution device 4, the subscriber To change the accommodation exchange from analog to ISDN,
All that is required is to change the station data.

Further, the multi-frame structure of the SG channel according to the present invention will be described in detail. First, the upstream SG channel of the I subscriber is configured as 3 multi-frames 18, and the upstream SG channel is referred to as ST. 1
The upper 7 bits of the time slot (8 bits) are ST
The remaining 1 bit is used as a signal and as a multi-frame bit indicating the order of 3 multi-frames. As shown in FIG. 8, S of the first, second, and third multi-frames
T signals are ST-MF0, ST-MF1 and ST-, respectively.
As MF2, the multi-frame bits indicating the first, second, and third multi-frames are "1",
It is defined as "1" and "0". The downlink SG channel of the I subscriber is 3 multiframes 2
5 and the downlink SG channel is CO
High-order side 7 in one time slot (8 bits)
The bits are used as a CO signal, and the remaining 1 bit is used as a multi-frame bit indicating the order of 3 multi-frames. As shown in FIG. 8, CO signals of the first, second, and third multi-frames are CO-MF0 and CO-M, respectively.
Multiframe bits indicating F1, CO-MF2, and the first, second, and third multiframes are defined as "1", "1", and "0", respectively. On the other hand, the upstream SG channel of the subscriber A is configured as a non-multiframe, that is, one multiframe 23, and the upstream SG channel is called SCN, and therefore, the multiframe bit is unnecessary. In other words, all 8 bits in one time slot are used as the SCN signal (actually, only 3 bits are used among those 8 bits). The downlink SG channel of the subscriber A is called SD, and is configured as 3 multiframes 28. However, as shown in FIG. 8, the signal of the first multi-frame is d. c (don't
care), only the signals of the second and third multi-frames are significant as SD, and the multi-frame bits “1”, “1” and “0” are added in the same manner as CO. It has become a thing.

Furthermore, the distribution device 4 according to the present invention will be described. The distribution device 4 includes an upstream signal processing unit 7, a downstream signal processing unit 8, a multiplexing circuit 9 and a time switch 1.
0, the demultiplexing circuit 11 and the synchronizing circuit 33, and a maximum of 512 transmission devices 3 can be accommodated in parallel via the up / down time division multiplexing transmission line 30, while the A subscriber exchange 5 , I subscriber exchanges 6 are accommodated in each. By the way, the transmission path distance when each of the transmission devices 3 is housed in the distribution device 4 is generally different for each transmission device 3, and therefore, the multi-frame phase of the upstream SG channel from each transmission device 3 is transmitted. Although there is a phase difference between the devices, in the distribution device 4, the multi-frame phase of the upstream SG channel from each of the transmission devices 3 is synchronized with the in-device phase, and A / A
The multi-frame structure of the I subscriber's uplink SG channel is A
It is necessary to convert into a multi-frame configuration for each of the subscriber exchange 5 and the I subscriber exchange 6. This up S
The G-channel multiframe conversion is performed on the transmission device-compatible upstream signal processing unit 7. As shown in the figure, the upstream signal processing unit 7 is composed of a B / SG separation circuit and an A / I subscriber multi-frame conversion circuit 12 for 128 subscribers. Frame synchronization is performed by monitoring the frame signal F from the division multiplex transmission line 30, and each subscriber signal from the (uplink) time division multiplex transmission line 30 is sent to B (B1,
B2), D, and SG are separated for each channel. Of these, the separated SG channel has been subjected to predetermined multiframe conversion processing by the A / I subscriber multiframe conversion circuit 12 for that subscriber. ing. For example, the upstream SG channel for the first subscriber at the accommodation position on the (uplink) time division multiplex transmission line 30 is the first A / I subscriber multiframe conversion circuit 12 and the 128th addition at the accommodation position. Upstream SG channel for the user is the 128th A
/ I subscriber multi-frame conversion circuit 12 converts each into four multi-frames. After all,
The A / I subscriber multi-frame conversion circuit 12 is provided commonly to A / I subscribers. In this way
From each A / I subscriber multiframe conversion circuit 12,
The upstream SG channel after conversion processing into 4 multiframes is output to the multiplexing circuit 9 as a state of being multiplexed on one highway while maintaining the order on the (uplink) time division multiplexing transmission line 30. In the same manner as in B (B
1, B2) and D channels are also output to the multiplexing circuit 9 as a highway in which only the B channel and D channel are collected. After all, 4 from each of the uplink signal processing units corresponding to the maximum of 512 transmission devices 3 respectively.
In the highway of the book, the multiplexing circuit 9 is used for each B1 channel and B2.
The signals are multiplexed in channel units, D channel units, SG channel units and output to the time switch 10. In the time switch 10, A / I preset as station data is set.
The A subscriber signal and the I subscriber signal are distributed to the A subscriber exchange 5 and the I subscriber exchange 6, respectively, according to the path setting based on the subscriber type information.

Although the above description has been made in the upstream direction, in the downstream direction, the A subscriber switching device 5 or the I subscriber switching device 6 transmits a subscriber signal in a direction opposite to the upstream direction. In addition, it is processed in a predetermined manner. The subscriber signal is once synchronized by the synchronizing circuit 33, and then the transmission device 3 is separated by the separating circuit 11 via the time switch 10.
After being separated according to the correspondence, as shown in FIG. 8, the B / SG multiplex circuit corresponds to the transmission apparatus 3 (downlink) time division multiplex transmission line 30.
In the state of being multiplexed above, it has been transmitted to the corresponding transmission device 3. At that time, in particular, for the downlink SG channel as 4 multiframes from the A subscriber exchange 5 or the I subscriber exchange 6, the synchronization circuit 33
After being converted to a common phase in the distribution device 4 and separated by the time switch 10 corresponding to the transmission device 3, the separated downlink SG channel is converted into an A / I subscriber multiframe by the downlink signal processing unit 8. Circuit 12 with 3 multiframe 2
Converted to 5 or 3 multi-frame 28 and B
(B1, B2) and D channel are multiplexed by a B / SG multiplexing circuit.

As can be seen from the above, since the A / I subscriber multi-frame conversion circuit 12 is configured to be shared by the A subscriber and the I subscriber, the amount of hardware can be reduced accordingly. Upstream / downstream SG channels are more economically multiframe-converted as compared with the above multiframe conversion methods.

Now, the A / I subscriber multi-frame conversion circuit 12 according to the present invention will be described. FIG. 2 shows a concrete configuration as an example. As shown, 12 multi-buffer memories (specifically, for example, 2
For the port memory 13), in synchronization with the input data (upstream / downstream SG channel), the write address output circuit 14 continuously and cyclically updates the write address (frame cycle) every frame cycle. WA)
19 is generated as 0 to 11, and is given. On the other hand, in parallel with this, from the read address output circuit 15 and the read address output circuit 16, respectively,
Read addresses 21 and 26 that are cyclically and sequentially updated are generated in each frame cycle, but a read address selection signal from outside (upstream / downstream SG channel type signal and A / I subscriber) is generated. One of the read addresses 21 and 26 is selectively output as a read address (RA) from the selector to the 12 multi-buffer memory 13 by a separate signal). As a result, while the input data is stored in the 12 multi-buffer memory 13 in the order of consecutive addresses, the read address (R
The input data corresponding to A) is sequentially read as output data. The multi-frame bit insertion circuit 17 receives a read address selection signal from the outside for each sequentially read output data. The multi-frame bit 32 is generated in a predetermined manner and then added by the selector.

Here, the operation of the A / I subscriber multiframe conversion circuit 12 provided on the upstream signal processing section 7 will be described. In this case, the supervisory signal on the upstream SG channel is used as the input data, and the write address (WA) 19 from the write address output circuit 14 is 0 to 1.
While being generated as 1, the read address output circuit 15
From the read address 8, 0, 0, 1, 2,
3, 3, 4, 5, 6, 6, 7 are read addresses (RA)
Has been generated as.

More specifically, first, a case where the input data is the upstream SG channel of the I subscriber will be described. FIG. 3 shows the multiframe conversion processing of the upstream SG channel (ST). As shown in the figure, the data flow is from left to right and the time is from top to bottom. In this case, the input data 18 is an upstream SG channel having a 3-multiframe structure. That is, ST0-MF0, ST0-MF1 and ST are used as uplink SG channels.
0-MF2, ST1-MF0, ST1-MF1, ST1
-MF2, ..., ..., STn-MF0, STn-MF
1, STn-MF2, ... 8kHz in this order
It is input every cycle (frame cycle t). Therefore, as shown in the figure, when the write address 19 is sequentially and continuously updated, the upstream SG channels are sequentially stored in the 12 multi-buffer memory 13 in the order described above. On the other hand, in synchronization with the storage of the upstream SG channel, the upstream SG channel already stored is read out as output data 22 from the 12 multi-buffer memory 13 by the read address 21, and the multi-frame bit 32 is added. If yes, 3
The upstream SG channels having a multi-frame structure can be sequentially converted into the upstream SG channels having a 4-multi-frame structure. For example, ST0 forming 3 multi-frames
When -MF0, ST0-MF1 and ST0-MF2 are sequentially read, if only ST0-MF0 is read twice, the 3 multi-frames are S
T0-MF0, ST0-MF0 (dummy), ST0-M
It can be converted into 4 multiframes consisting of F1 and ST0-MF2. However, in this example, ST0-M
F0 is read as a dummy, but ST0-MF
Those other than 0 may be read as a dummy, and such a situation is the same even when the input data is the upstream SG channel of the A subscriber.

By the way, when each of the three 3 multi-frame equivalents is converted into 4 multi-frames, the write address returns to 0 and the address 0 is ST4.
-MF0 is newly stored, but the read data at this point is ST2-MF2, and therefore ST3-MF0-ST shown as shaded display in the figure.
The remaining 3-MF2 will be discarded. However, the ST has no problem because the data on the upstream SG channel has a property as a supervisory signal such as the subscriber terminal being off-hook. This is because the exchange that monitors the supervisory signal does not respond to changes in the supervisory signal one by one, but is protected in consideration of bit errors on the transmission path. Incidentally, although the write address 19 is generated as a continuous address in the above description, the read address 21 can be generated as a continuous address when it is generated as a predetermined discontinuous address. The same applies to the following.

Next, the case where the input data is the upstream SG channel of the subscriber A will be described. FIG. 4 shows the multiframe conversion processing of the upstream SG channel (SCN). Since the upstream SG channel (SCN) has a non-multiframe structure, it is assumed that the write address 19 and the read address 21 are generated in the same manner as in the above case in the case of the upstream SG channel of the I subscriber. The same multi-frame conversion processing as is applicable. As shown, input data 23
Is an SCN having a non-multiframe structure, and is sequentially stored on the 12 multi-buffer memory 13 in the order of SCN0, SCN1, SCN3, ...
The output data 24 is sequentially obtained from the 12 multi-buffer memory 13 by the read address 21, but since the SCN itself is not configured as a multi-frame, a multi-frame bit is inserted in the output data 24. It is not done. When the A / I subscriber-specific signal indicates the A subscriber, the generation of multiframe bits in the multiframe bit insertion circuit 17 is suppressed. Also, as in the case of ST, S
Since CN is also the SG channel for monitoring A subscribers,
Even if the data part shown as a shaded area in the figure is discarded, no problem will occur.

As can be seen from the above, the A / I subscriber multi-frame conversion circuit 12 having the same configuration does not depend on the A / I subscriber type, and the S as an upstream SG channel is
T and SCN can be converted into 4 multiframes.

On the other hand, the operation of the A / I subscriber multiframe conversion circuit 12 provided on the downlink signal processing section 8 will be described. In this case, the control signal on the downlink SG channel is the input data. In addition, the write address (WA) 19 from the write address output circuit 14 is 0 to 1
While being generated as 1, the read address output circuit 16
From the read address 11, 8, 10, 11, 0,
2, 3, 4, 6, 7, 8, and 10 are read addresses (R
In addition, the downlink SG channel generated as A) is converted from 4 multiframes to 3 multiframes.

More specifically, first, the case where the input data is the downlink SG channel of the I subscriber will be described. FIG. 5 shows the multiframe conversion processing of the downlink SG channel (CO). The downlink SG channel of 4 multiframe structure from the exchange side is converted to the downlink SG channel of 3 multiframe structure by the A / I subscriber multiframe conversion circuit 12. As shown in the figure, when the write address 19 is sequentially and continuously updated, the downlink SG channels are sequentially stored in the 12 multi-buffer memory 13, but on the other hand, in synchronization with the storage of the downlink SG channels. , 12 From the multi-buffer memory 13 by the read address 26, when the downlink SG channel already stored is read as the output data 27 and the multi-frame bit 32 is added, the downlink of the 4-multi-frame configuration is formed. SG channel is
It can be sequentially converted into an upstream SG channel having a 3-multiframe structure. At this time, the input data 25 is CO and has a 4-multiframe structure. Among them, for example, the second multiframe is d. c, that is, set as a dummy. Therefore, in order to convert this into the 3-multiframe structure, the read address 26 is generated so that the second multiframe as a dummy is not read as the output data 27.

By the way, when attention is paid to the time when the 3-multiframe conversion for CO2 is completed and a new CO3-MF0 is stored on the address 0 by the write address 0, all the 4-multiframes constituting the CO3 are Since it is not stored, the address 8, 10,
CO2 stored in 11 is read as 3 multiframes, and then 3 multiframe conversion for CO3 is performed. in this way,
CO2 is read twice as three multi-frames, but this does not cause any trouble. This is because, generally, in the subscriber circuit in the transmission device as the CO receiver or the terminal side DSU (subscriber termination device), even if the same CO is continuously received twice, no trouble occurs.

Next, the case where the input data is the downlink SG channel of the subscriber A will be described. FIG. 6 shows the multiframe conversion processing of the downlink SG channel (SD). In this case, the input data 28 is SD of 4 multi-frame structure from the exchange side, and S
In the subscriber circuit in the transmission device as the D receiver, it is 3
It is recognized as a multi-frame. However, of the three multi-frames, the first frame is d. c, which renders the circuit inoperative. Therefore, if the input data 28 is stored and read out in the same manner as the input data 25, the first multi-frame in the three multi-frames is, for example, SD0-MF.
However, in the subscriber circuit, as described above, the first frame is d. Since it is c, SD0-MF0 is treated as meaningless and no particular problem occurs. After that, SD1-MF0, SD1-MF
1 is read sequentially, so that SD0-MF1, SD0
4 multiframes consisting of -MF2, SD1-MF1 and SD1-MF2 can be converted to 3 multiframes. After that, if the same reading is performed, the subscriber circuit is d. The first multi-frame recognized as c is an even SD shown as a shaded display, and the significant second and third multi-frames are obtained as odd SDs.
Therefore, only the odd SDs are recognized by the subscriber circuit, but generally, the SD signal continuously changes over several tens of frames, so that even the odd SD among them can sufficiently transmit the signal.

As described above, in the A / I subscriber multi-frame conversion circuit 12 provided on the downlink signal processing unit 8, the downlink SG channel of 4 multi-frame structure is used regardless of the A / I subscriber type. It can be converted into a 3-multiframe structure.

[0027]

As described above, according to the first and second aspects, the A-subscriber multiframe conversion circuit corresponding to the subscriber is used when the upstream / downstream SG channel multiframe conversion is performed on the distribution device. In addition, the multi-frame conversion can be economically performed without requiring the I-subscriber multi-frame conversion circuit.

[Brief description of drawings]

FIG. 1 is a block diagram showing a plurality of analog subscribers and ISDN subscribers scattered in a remote place, a remote multiplex transmission device, an analog subscriber exchange through an subscriber distribution device according to the present invention, or an ISDN subscriber. Diagram showing an example of the configuration of a transmission / switching system in the case of accommodating it in a private branch exchange

FIG. 2 is a diagram showing a specific configuration of an example of an A / I subscriber multiframe conversion circuit according to the present invention.

FIG. 3 is a diagram showing a multiframe conversion process of an upstream SG channel (ST) when input data is an upstream SG channel of an I subscriber.

FIG. 4 is a diagram showing a multiframe conversion process of an uplink SG channel (SCN) of the subscriber A when the input data is the uplink SG channel of the subscriber A;

FIG. 5 is a diagram showing a multi-frame conversion process of a downlink SG channel (CO) of the I subscriber when the input data is the downlink SG channel of the I subscriber.

FIG. 6 is a diagram showing a multi-frame conversion process of a downlink SG channel (SD) when the input data is the downlink SG channel of the A subscriber.

[FIG. 7] FIG. 7 shows a plurality of analog subscribers and ISDN subscribers scattered in a remote place as an analog subscriber exchange or an ISDN subscriber exchange via a remote multiplex transmission device, a subscriber distribution device. A diagram showing a configuration example of a transmission / switching system according to a conventional technique in the case of accommodating

FIG. 8 is a diagram showing a subscriber signal frame format on the time division multiplex transmission line between the remote multiplex transmission equipment and the subscriber distribution equipment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Analog subscriber, 2 ... ISDN subscriber, 3 ... Remote multiplex transmission apparatus, 4 ... Subscriber distribution apparatus, 5 ... Analog subscriber exchange, 6 ... ISDN subscriber exchange, 7 ... Uplink subscriber signal processing unit , 8 ... Downlink subscriber signal processing unit, 9 ... Multiplexing circuit, 10 ... Time switch, 11 ... Separation circuit, 12 ...
A / I subscriber multi-frame conversion circuit

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Koichi Shimizu Inventor, Koichi Shimizu 216 Totsuka-cho, Totsuka-ku, Yokohama-shi, Kanagawa Hitachi, Ltd. Hitachi, Ltd., Information & Communication Division (72) Inventor Kiyo Furukawa, 216 Totsuka-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture, Ltd. Hitachi, Ltd., Information & Communication Division (72) Inventor, Yuki Kato 3-chome Nishishinjuku, Shinjuku-ku, Tokyo 19-2 Nihon Telegraph and Telephone Corporation (72) Inventor Yasuo Otsubo 3-chome Nishishinjuku, Shinjuku-ku, Tokyo 19-2 Nihon Telegraph and Telephone Corporation (72) Inventor Makoto Iwamoto Nishi-Shinjuku, Shinjuku-ku, Tokyo 3-19-2 Nippon Telegraph and Telephone Corporation (72) Inventor Yuji Yokoi 3-19-2 Nishishinjuku, Shinjuku-ku, Tokyo Nippon Telegraph and Telephone Corporation (56) References JP-A-9-8906 (JP, A) JP-A-5-75567 (JP, A) JP-A-9-23491 (JP, A) (58) Fields investigated (Int .Cl. ⁷ , DB name) H04J 3/00-3/26 H04L 5/22-5/26 H04L 12/00-12/28 H04L 12/50-12/66 H04M 3/00 H04M 3/16-3 / 20 H04M 3/38-3/40 H04M 7/00-7/16 H04Q 3/52 H04Q 11/00-11/08

Claims (2)

(57) [Claims] 1. A remote multiplex transmission apparatus each accommodating a plurality of analog subscribers and ISDN subscribers scattered at remote locations, an analog subscriber exchange, and an IS.
A multi-frame conversion method for a supervisory / control signal on an SG channel in a subscriber allocating device, which is interposed between each of the DN subscriber exchanges and is close to the exchange. As for the subscriber signal transmitted on the upstream time division multiplex transmission line, while the SG channel multi-frame phase is synchronized with the subscriber distribution apparatus internal phase by the subscriber distribution apparatus, the remote multiplex transmission apparatus and the subscriber It is separated into voice signals, data signals, and supervisory signals as B (B1, B2), D, and SG channels corresponding to each person, and joined from all remote multiplex transmission devices as multiplexed on the channel corresponding highway. After the subscriber signal is multiplexed, an analog subscriber exchange or IS depending on the subscriber type through the time switch. While it distributed to the N subscriber exchange, an analog subscriber exchange, subscriber signals from the exchange each for ISDN subscriber at subscriber sorter S
The G channel multi-frame phase is synchronized with the phase in the subscriber distribution device, and is separated into a remote multiplex transmission device and a subscriber correspondence via a time switch, and B (B1, B2), D, SG respectively. The voice signal, the data signal, and the control signal as channels are multiplexed in correspondence with the remote multiplex transmission device, and the subscribers are distributed while being transmitted as a frame on the downlink time division multiplex transmission line to the remote multiplex transmission device. On the equipment, the SG channel corresponding to the analog subscriber of the upstream n multi-frame configuration of the separated state or the IS channel of the ISDN subscriber of the upstream m (> n) multi-frame configuration from the remote multiplex transmission equipment corresponds to the subscriber. K (> m) multi-frame configuration to switch for analog subscribers or switch for ISDN subscribers via buffer memory While being converted into the SG channel, the SG channel of the downlink k multiframe configuration from the exchange for analog subscribers or the exchange for ISDN subscribers is transmitted to the remote multiplex transmission equipment via the buffer memory corresponding to the subscribers. Supports analog subscribers S
ISD with G channel or downlink m multiframe configuration
A multiframe conversion method for converting to an SG channel for N subscribers. 2. A remote multiplex transmission apparatus each accommodating a plurality of analog subscribers and ISDN subscribers scattered at remote locations, an analog subscriber exchange, and an IS.
A multi-frame conversion method for a supervisory / control signal on an SG channel in a subscriber allocating device, which is interposed between each of the DN subscriber exchanges and is close to the exchange. As for the subscriber signal transmitted on the upstream time division multiplex transmission line, while the SG channel multi-frame phase is synchronized with the subscriber distribution apparatus internal phase by the subscriber distribution apparatus, the remote multiplex transmission apparatus and the subscriber It is separated into voice signals, data signals, and supervisory signals as B (B1, B2), D, and SG channels corresponding to each person, and joined from all remote multiplex transmission devices as multiplexed on the channel corresponding highway. After the subscriber signal is multiplexed, an analog subscriber exchange or IS depending on the subscriber type through the time switch. While it distributed to the N subscriber exchange, an analog subscriber exchange, subscriber signals from the exchange each for ISDN subscriber at subscriber sorter S
The G channel multi-frame phase is synchronized with the phase in the subscriber distribution device, and is separated into a remote multiplex transmission device and a subscriber correspondence via a time switch, and B (B1, B2), D, SG respectively. The voice signal, the data signal, and the control signal as channels are multiplexed in correspondence with the remote multiplex transmission device, and the subscribers are distributed while being transmitted as a frame on the downlink time division multiplex transmission line to the remote multiplex transmission device. On the device, an SG channel corresponding to an analog subscriber having an upstream 1 multiframe configuration or an ISDN subscriber channel having an upstream 3 multiframe configuration in a separated state from a remote multiplex transmission device is a 12 frame capacity buffer corresponding to a subscriber. 4 multi-frame configuration via memory to analog subscriber switch or ISDN subscriber switch While being converted into SG channel, SG channel downlink 4 multiframe structure of an analog subscriber exchange, or ISDN subscriber exchange via a subscriber corresponding 12 frames capacity buffer memory,
A multi-frame conversion method for converting into an SG channel corresponding to an analog subscriber having a downlink 3 multi-frame configuration or an ISDN subscriber channel having a downlink 3 multi-frame configuration to a remote multiplex transmission device.