JP2828417B2 - Unified switching system for analog line-related information signals and ISDN line-related information signals in telephone exchanges - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an analog line subscriber exchange and an analog line subscriber switching system which convert an analog line-related information signal and an ISDN line-related information signal input to an analog / I line remote unit.
The present invention relates to a unified switching system for an analog line-related information signal and an ISDN line-related information signal when the signal is distributed to an interface subscriber exchange.

[0002]

2. Description of the Related Art In a conventional telephone exchange, an analog line subscriber (hereinafter referred to as A subscriber) and an ISDN line subscriber (hereinafter referred to as I subscriber) are processed by different dedicated exchanges. I have. However, with the introduction of the optical cable to the subscriber system, it is required that the signal from the A subscriber (analog line related information signal) and the signal from the I subscriber (ISDN line related information signal) be accommodated in the same cable. It has come to be.

As described above, by introducing an optical cable, an analog line-related information signal (hereinafter, referred to as an A line signal) and an ISDN line-related information signal (hereinafter, referred to as an I line signal) are accommodated in the same cable. In such a case, when performing the circuit switching processing, each signal is converted into an analog circuit subscriber exchange (hereinafter, referred to as an A exchange) or an I exchange.
It is necessary to perform a process of distributing to each of the interface subscriber exchanges (hereinafter, referred to as I exchanges).

[0004] FIG. 2 shows a conventional method considered for distributing an A-line signal and an I-line signal in a telephone exchange.

[0005] The system shown in FIG. 2 is described in the literature: "A / I subscriber line single station apparatus for optical subscriber multiplex transmission system (" NTT ").
R & D Vol. 40 No. 6 1991 ")].

In FIG. 2, reference numeral 1 denotes an analog / I line subscriber line terminal equipment, and 2 denotes an analog / I line remote unit (hereinafter, A) for multiplexing transmission of A line signals and I line signals on the same optical cable. / I-RT device), 3 is an analog / I line terminal device, 4 is a remote monitoring test device, 5 is a terminal monitoring test device, 6 is a D70 type A exchange, 7 is an I exchange, 8 Is an optical subscriber line multiplex transmission section.

In the case of this example, both the A-line signal and the I-line signal are temporarily accommodated in the A-exchange 6, and the I-line signal is transmitted to the network units (communication path switch units) 6a and 6b in the A-exchange 6. Through to the exchange for I 7. FIG. 3 shows a format (SHG format) in this case.

The network unit 6a is a line concentrator (referred to as LCNE).
b is a communication path device (called TDNW).

However, in the sorting method as shown in FIG.
The network signals 6a and 6b of the A exchange 6
Is fixedly occupied, and the capacity of the A exchange 6 is reduced. Also, the SHG unit as shown in FIG. 3 is completely divided into one for A subscriber and one for I subscriber, and the SHG unit for A subscriber accommodates 32 subscribers, Eight subscribers are accommodated in the SHG unit for the I subscriber, and efficient distribution cannot be performed by such distribution in the SHG unit.

Therefore, the network unit 6 of the A exchange 6
The I line signal is separated before a and 6b (point V),
It is desired to realize a distribution system for passing the separated I line signal to the I exchange 7 without passing through the A exchange 6. Also, it is desired to realize a distribution method in which the distribution is distributed to the A exchange 6 or the I exchange 7 for each subscriber.

[0011]

In the case of the configuration shown in FIG. 2, if switching is to be performed while maintaining the format (SHG format) at the V _{A / I} point immediately before the _A exchange 6, this network system must be used. The accommodating ratio between the A-subscriber and the I-subscriber is 4: 1 in terms of the subscriber ratio, and the network operation balance is poor. Conventionally, this is performed through the voice network of the exchange A for A
This is because the format is such that the D channel (I interface signal channel) and the SG channel (subscriber circuit control signal channel) of the I line signal are switched.

The I-line signal can be passed to the I-exchange without passing through the A-exchange, and the distribution method that can be distributed to the A-exchange or the I-exchange for each subscriber is simply as follows. , The configuration shown in FIG.

That is, the subscriber interface unit 17 separates the multiplexed signal from the A / I-RT device 12 and
The line signal is provided to the A exchange interface unit 22 via the A network unit 30, and the subscriber interface unit 17 separates the I line signal obtained by separating the multiplexed signal from the A / I-RT device 12 into the I network signal. A distribution method to be given to the I exchange interface unit 23 via the unit 31 is conceivable.

However, the distribution system shown in FIG. 4 requires separate network sections 30 and 31 for each of the A-line signal and the I-line signal, which is not economical.

The A / I accommodation ratio in the subscriber interface unit 17 is fixedly determined by the configuration of the A network unit 30 and the I network unit 31.
It is difficult to flexibly set the A / I accommodation ratio.

Further, separate configurations for each of the A-line signal and the I-line signal (for example, the network unit 30,
31 and the output configuration of the conversion unit in the subscriber interface unit 17), the system can be economically configured if the configurations are the same.
As shown in (1), the difference between the data formats of the A-line signal and the I-line signal is large, and the separate configurations of the A-line signal and the I-line signal cannot be the same. ing.

The present invention has been made in view of the above-mentioned circumstances, and is intended to distribute an A-line signal and an I-line signal transmitted from an A / I-RT device to an A exchange and an I exchange. That the path setting can be performed without being aware of the contents of the signal channels of the A subscriber and the I subscriber, that the A / I accommodation ratio can be flexibly set to an arbitrary ratio (for example, 2: 1);
And it aims at being able to construct the whole system economically.

[0018]

A subscriber for detecting and separating an analog line-related information signal and an ISDN line-related information signal transmitted in a mixed state from an analog / I line remote unit for each of B channel, D channel, and SG channel. A user interface unit, a network unit provided for each channel for performing a channel selection process on a signal for each channel detected and separated by the subscriber interface unit according to a destination, and a network unit for each channel An exchange interface for A which sends an analog line-related information signal among the signals processed in step A to an exchange for analog line subscribers;
In a configuration having an I-switch interface unit for sending an ISDN line-related information signal among the signals processed by the network unit for each channel to the I-interface subscriber exchange, for one frame of the B channel, A format in which one frame of the D channel and two multiframes of the SG channel are allocated is adopted.

[0019]

The analog line-related information signal and the ISDN line-related information signal are both processed in a common format in which the SG channel is composed of two multi-frames. The usage rate is proportional to the number of B channels owned by each, so that path setting can be performed without being aware of the difference between analog and ISDN information signals.

[0020]

FIG. 1 shows an embodiment of a switching system according to the present invention, in which the same or corresponding parts as in FIG. 4 are denoted by the same reference numerals.

In FIG. 1, reference numeral 10 denotes a terminal for an analog line (hereinafter, referred to as an A terminal), 11 denotes a terminal for an ISDN line (hereinafter, referred to as an I terminal), and 12 denotes an A line signal and an I terminal.
A / I for multiplex transmission of line signals on the same optical cable
An RT device 13, an A switch for exclusive use for A line signal exchange processing; and 14 an I exchange for an I line signal exchange processing exclusive switch.

The A-line signal and I-line signal transmitted in a mixed state from the A / I-RT device 12 are
A subscriber interface unit 17 that detects and separates each channel of the channel and the SG channel; and a channel interface unit 17 detects and separates the signal of each channel detected and separated by the subscriber interface unit 17 according to a destination. Network units 18, 19, and 20, an A-switch interface unit 22 that sends an A-line signal among the signals processed by the network units 18, 19, and 20 to the A-switch 13, and each network unit The I-switch interface unit 23 for sending an I-line signal among the signals processed in the 18, 18, and 20 to the I-switch 14, the path setting in each of the network units 18, 19, and 20 and the setting of each interface unit. The system is provided with a control unit (not shown) for the entire apparatus for performing a measure against a failure or the like.

The above three network units 18, 19,
20, the network unit 18 is for the B channel for transferring data in units of 64 kbit / s.
Reference numeral 9 denotes a D channel for transferring data in units of 8 kbit / s, and a network unit 20 denotes an SG channel for transferring data in units of 64 kbit / s.

In the data transfer between the subscriber interface unit 17 and each of the exchange interface units 22 and 23, as shown in FIG. 6B, each time slot is used for one frame of the B channel. , One frame of the D channel and two multiframes of the SG channel, and adopts a unified data format common to the A line signal and the I line signal.

For the A-line signal shown in FIG.
One time slot in the unified data format is used. The B channel signal B of the A line signal is inserted into the B channel signal area of the unified data format. The SG channel signals F ₁ and F ₂ of the A line signal are inserted into the SG channel signal area of the unified data format of two multiframes. The D channel signal area of the unified data format is empty (D.
C. ).

On the other hand, for the I-line signal shown in FIG. 6C, two time slots (preferably two consecutive time slots) in the unified data format are used. The B channel signals B ₁ and B ₂ of the I line signal are respectively inserted into the B channel signal areas of different time slots of the unified data format. The D channel signals D ₁ and D ₂ of the I line signal are respectively inserted into the D channel signal areas of different time slots of the unified data format. SG channel signal F _0, F ₁ of the I SG-channel signal F ₀ of the line signal, F _1, F ₂ is inserted into the SG channel signal area of the front timeslot unified data format of 2 multiframe, S
G channel signal F ₂ is inserted into the SG channel signal area of the rear of a time slot, other SG channel signal area of the rear of a time slot becomes free (, D.C.).

Next, the switching operation in this format will be described.

In the case of processing the A line signal, the network section 18 for the B channel transmits the input from the subscriber interface section 17 to the exchange interface section 22 for A (in FIG. 1, the transmission path [1] and the transmission path [1]). Path connecting the road [2]). Network part 1 for D channel
9 and the network unit 20 for the SG channel, the input from the subscriber interface
The path to be sent to the switchboard interface unit 22 is set one by one. Then, in the A exchange interface section 22, the B channel and the SG
A predetermined conversion process is performed on the data of the channel, and the data for the D channel is processed as empty (in FIG. 1 and FIG. 6, the D channel of the A line signal has DC = Do.
n't Care).

Next, a case of processing an I line signal will be described. Since two B channels are allocated to one subscriber for one subscription, as shown in FIG. 1, in the network unit 18 for the B channel, an input from the subscriber interface unit 17 is input to the I exchange interface unit. two paths to be sent to 23 (in FIG. 1, the transmission line [3] to the transmission line [4] and the path B ₁ connecting the transmission lines [5] to the transmission line [6] path B ₂ connecting the 2 One) to set. Similarly, in the network unit 19 for the D channel and the network unit 20 for the SG channel, two paths for sending the input from the subscriber interface unit 17 to the I exchange interface unit 23 are similarly set (for the D channel). Path D ₁ , D _{2 in} the network section 19, and paths SG ₁ , SG _{2 in} the SG channel network section 20).

The I exchange interface section 23
Then, according to the connected accommodation position, B channel and D channel
A predetermined conversion process is performed on the data of the channel and the SG channel.

In the case of the D channel, the data rate is usually 16 kbit / s. In this embodiment, the data rate is 8 kbit by associating the two B channels for the I line signal one bit at a time. It can switch at a rate of / s.

In the case of the SG channel, there is an amount of information corresponding to 2 multiframes in the case of the A line signal and 3 multiframes in the case of the I line signal. In order to be able to process such an A-line signal and an I-line signal in the same manner, in this embodiment, the format is as shown in FIG. That is, in the case of the A line signal, two multi-frames of F ₁ and F ₂ are allocated to the SG channel corresponding to the B channel. On the other hand, in the case of an I line signal, F ₀ and F ₁ are assigned to the SG ₁ channel corresponding to the B ₁ channel,
The SG ₂ channel corresponding to the B ₂ channel has F ₂ , D.
C. (Empty).

By adopting such a format, both the A-line signal and the I-line signal can be unified into a format in which the SG channel is composed of two multi-frames, and the path is set uniformly for both signals. It becomes possible.

As shown in FIG. 6, the SG channel has a two-multiframe configuration, and the D channel has a format corresponding to the B ₁ and B ₂ channels.
The line signal and the I line signal can be handled in a common format, whereby the processing of the A line signal and the I line signal can be standardized, and the network units 18, 19, 20 It is also possible to simplify the control unit for controlling the operation in.

Further, since the network units 18 to 20 are commonly used for transmitting the A-line signal and the I-line signal, the system can be constructed economically. In addition, each of the exchange interface units 2 is connected to the subscriber interface unit 17.
Since the data format for the lines 2 and 23 is unified for the A-line signal and the I-line signal, it is common to apply the same configuration as the constituent elements of each unit. Can be built.

Furthermore, on the unified data format,
A line signal and I line signal can be arbitrarily carried. Therefore, the distribution to the A exchange 13 and the I exchange 14 can be performed for each subscriber, and the distribution can be performed efficiently. In addition, the subscriber interface unit 17 can determine that the A-line signal and the I-line signal are arbitrarily put on the unified data format. In other words, the A-subscriber and the I-line
The accommodation ratio with the subscriber can be arbitrarily and flexibly set. For example, if the accommodation ratio between the A subscriber and the I subscriber on the network unit is 2: 1, the same number of time slots on the unified data format for the A and I subscribers may be used. Assuming that the accommodating ratio with the I subscribers is 4: 1, the time slots on the unified data format may be 2: 1 for A and I. That is, it is possible to flexibly cope with the ratio of the number of A subscribers and the number of I subscribers of the system installation station.

[0037]

According to the present invention, both the analog line-related information signal and the ISDN line-related information signal are SG signals.
The channel is composed of two multi-frames, and the D channel is B
_1, B ₂ to be processed in a common format associated with the channel, it is possible to standardize the path setting of the analog line-related information signals and ISDN line related information signals, perform the sorting of subscriber units It is possible to provide a method of switching between an analog line-related information signal and an ISDN line-related information signal in a telephone exchange, which is economical and can flexibly set the accommodation ratio between the analog line subscriber and the ISDN line subscriber.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a conventional distribution method.

FIG. 3 is an explanatory diagram showing a format (SHG format) at a V _{A / I} point immediately before an A exchange.

FIG. 4 is an explanatory diagram of another conventional distribution method.

5 is an explanatory diagram of a difference between data formats of A and I line signals in FIG. 4;

FIG. 6 is an explanatory diagram of a data format of each channel in one embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 12 A / I-RT device 13 A exchange 14 A exchange 17 Subscriber interface 18, 19, 20 Network 22 A exchange interface 23 A exchange interface

──────────────────────────────────────────────────続 き Continuation of the front page (73) Patent holder 000005223 Fujitsu Limited 4-1-1, Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa (72) Inventor Kiyoshi Yamaguchi 1-7-12 Toranomon, Minato-ku, Tokyo Offshore (72) Inventor Hirofumi Horikoshi 1-1-6 Uchisaiwai-cho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Inventor Tadashi Minami 1-6-1, Uchisaiwai-cho, Chiyoda-ku, Tokyo Japan Within Telegraph and Telephone Co., Ltd. (72) Inventor Eiichiro Kobayashi 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Inventor Kazuhiro Okashita 5-7-1, Shiba, Minato-ku, Tokyo Japan Electric Co., Ltd. (72) Inventor Koichi Shimizu 216 Totsuka-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Hitachi, Ltd.Information and Communication Division (72) Inventor Makoto Hanada (2) 1015 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture Inside Fujitsu Limited (56) References JP-A-4-79463 (JP, A) JP-A-6-311128 (JP, A) JP-A-7-193627 (JP) , A) (58) Field surveyed (Int. Cl. ⁶ , DB name) H04M 3/00 H04Q 3/42 104 H04Q 11/04

Claims (1)

(57) [Claims] When the analog / I-line related information signal and the ISDN line-related information signal transmitted in a mixed state from the analog / I-line remote device are distributed to the analog-line subscriber exchange and the I-interface subscriber exchange, A subscriber interface unit for detecting and separating the analog line-related information signal and the ISDN line-related information signal transmitted in a mixed state from the analog / I line remote unit for each of B channel, D channel, and SG channel; Of the signals processed in the network section,
A switch interface unit for sending an analog line related information signal to the analog line subscriber switch, and a signal processed by a network unit for each channel,
An I exchange interface unit for sending an ISDN line related information signal to an I interface subscriber exchange ; the subscriber interface unit and the I exchange interface;
Data transfer of the A-line signal to and from the
A subscriber interface unit and the I exchange interface
In the data transfer of the I line signal to and from the frame part, one frame of the D channel and one frame of the S channel correspond to one frame of the B channel.
A common system to which two multi-frames of G channel are assigned
Information signal and ISD related to analog line in telephone exchange characterized by adopting one data format
Unified switching system with N-line related information signals.