JPH03159496A - Remote subscriber accommodating equipment - Google Patents

Abstract

PURPOSE:To remove the restriction of the multiplex degree for the remote subscriber lines and the restriction of the ports of a layer terminal circuit of the D channel on the side of the exchange by constituting so that the subscriber is accommodated as a primary subscriber in ISDN exchange by multiplexing the distant place ISDN subscribers. CONSTITUTION:A remote subscriber accommodating equipment 18 has the subscriber line termination equipments 14a, 14b and the layer 2 termination circuits 9c, 9d of the ISDN subscriber lines 4a, 4b, and the termination equipment 14a, 14b execute the synchronization circuit and a D channel the separation multiplication in the 2B+D, and the D channel is connected to the layer 2 termination circuit 9c, 9d. The circuit exchange call control of D channel that transmits and receives with this subscriber execute the network side layer 3 treatment at a remote subscriber controlling equipment 17, and exchanges a layer 3 of the primary rate access interface with the high rank ISDN exchange equipment, and is transmitted/received at the high rank ISDN exchange equipment 12 by a primary rate access interface layer 2 termination circuit 9e through a first group interface equipment 6a, the transmission line 7, and a first group interface equipment 6b.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to ISDN exchanges, and more particularly to remote subscriber accommodation equipment.

[Conventional technology]

Conventionally, when accommodating ISDN subscribers in remote locations in an ISDN exchange, BELLCORFJTR-000303
INTEGRATED DIGITAL as shown in
LOOP CARRIER (hereinafter simply referred to as IDLC)
In fact, 2B+D of ISDN subscriber lines in remote areas were time-division multiplexed and connected to an ISDN exchange.

FIG. 2 is a connection configuration diagram showing a conventional remote subscriber accommodation device. In the figure, 1a and 1b are the subscriber's premises S
- interface buses 2a and 2b are ISDN terminals connected to the customer premises S-interface buses 1a and 1b, respectively; 3a and 3b are network termination devices 4m for the customer premises S-interface buses taTh and 1b; and 4b is a subscriber line, 5 is a multiplexer, and 6
6 and 6b are primary group interface devices, 7 is a transmission line connecting between the primary group interface devices 6 and 6b, 8 is an insertion/separation circuit, and 9a> and 9b are layer 2#
! In the end circuit, 10 is a layer 3 processing unit, 11 is an inter-processor communication link, 12 is an ISDN switch, and 13 is a call processing processor.

Next, according to the remote subscriber accommodating device having the above configuration, an ISDN subscriber in a remote location can access the network terminating device No. 3, 3b Th
and ISDN terminals 2m and 2b connected to the subscriber premises system S-interface buses 1m and 1b. However, since these subscribers are located in remote locations, in order to accommodate them in the ISDN exchange 12, they are first multiplexed by the multiplexer 5 and then transferred to the primary group interface device 6m. I through 6b
Connect to the SDN exchange 12. The primary group interface devices 6a and 6b are BELLCORE TR-00.
According to the IDLC shown in 0303, ISDN subscriber lines 2B and 1D in remote areas are time-division multiplexed, so if it is a 24 channel system (1.544MHz),
BPS) + D (16KBPS), for example, is multiplexed into 8 additions, and 18 out of 24 channels (8” (
+NB+1/4D)=18B) to prepare an interface to connect to the upper ISDN exchange 12. In this upper ISDN exchange 12, 18 of these 24 channels
The D channel part of the channel is removed by the insertion/separation circuit 8,
Layer 2 is processed in layer 2 termination circuits 9m and 9b,
Layer 3 processing unit 101 Passes layer 3 information of the CD channel.

If the layer 3 processing unit 10 determines that the call is a circuit switched call, it passes the information to the circuit switched call processing processor 13 via the interprocessor communication link 11 and processes the call.

[Problem to be solved by the invention]

The conventional remote subscriber accommodating device described above time-division multiplexes subscriber lines in remote locations on the primary group interface device with the ISDN exchange, accommodates the subscriber lines in the ISDN exchange, and connects the subscriber lines in the remote locations on the rsDN exchange side. Since the layer 2 of the D channel is terminated, there are drawbacks such as a limit on the multiplicity of subscriber lines at remote locations on the primary group interface and a limit on the number of votes for the layer 2 termination circuit of the D channel on the ISDN exchange side.

[! ! Means to solve the problem]

A remote subscriber accommodating device according to the present invention includes layer 1 and layer 2 termination circuits of ISDN subscriber lines, subscriber accommodating ISD
Equipped with layer 1 and layer 2 termination circuits for the 23B+D primary late access interface with the
The configuration is such that it supports circuit-switched calls on the primary late access interface.

[Effect]

This invention enables ISDN subscribers in remote locations to be multiplexed and
It can be accommodated in the DN exchange as a primary subscriber.

〔Example〕

FIG. 1 is a connection configuration diagram showing an embodiment of a remote subscriber accommodating device according to the present invention. In the figure, 14m and 14b are subscriber line termination devices, 15 is a B channel exchange switch, 16 is an inter-processor bus, 17 is a remote subscriber control device, and 18 is the above-mentioned primary group interface device 6m, layer 2 termination circuit. 9c. 9d and 9e+ subscriber line termination device 14 & and 14b, B channel exchange switch 15
, interprocessor bus 16 and remote subscriber controller 1γ
This is a remote subscriber accommodating device that was developed from the beginning.

Next, in the remote subscriber accommodating device having the above configuration, rSDN subscribers at remote locations are connected to the network termination devices 3a, 3b and the S-interface bus 1m. It consists of ISDN ends 2m and 2b each connected to 1b.

Furthermore, since these subscribers are located in remote locations, in order to accommodate them in the ISDN exchange 12, they must be multiplexed once in the remote subscriber accommodation device 18, and then transferred to the primary group interface device 6m.
6b to the ISDN exchange 12. This IS
The DN exchange 12 is processed by a call processing processor 13. In addition, this ISDN exchange 12 directly accommodates the IS
There are also DN subscribers 1e + 2e r3e k and 4c. On the other hand, the remote subscriber accommodating device 18 is provided with subscriber line termination equipment fl 14m . 1
4b and layer 2 termination circuit 9c. sd, and this subscriber line terminal equipment j4m. t4b performs ISDN subscriber line synchronization circuit and 2B+D D channel separation/multiplexing, and the D channel is connected to layer 2 termination circuit 9C9d. Circuit-switched call control of the D channel sent to and received from this ISDN subscriber is performed by the remote subscriber control device 17 using the CCIT.
The network side Layer 3 processing shown in the TI series Q931 is performed, converting to Layer 3 of the primary late access interface with the upper ISDN exchange, and converting to Layer 2 of the primary late access interface. Through the end circuit 9e, the primary group interface device 6m + transmission line 1, and the primary group interface device 6b are connected to the upper ISDN.
The data is transmitted to and received from the exchange 12. This remote subscriber control device 1
For example, when there is a message from a remote subscriber, the layer 3 conversion process in 7 is the primary late access ◆
In order to correspond to layer 3 of the interface, the call identifier in the message on the primary late access side is the line number of the remote subscriber line/layer 2 link number (TEL No) of that subscriber line/layer 3 call identifier. The channel identifier (23B/30B) is converted into the line number of the remote subscriber line/B++B2 channel number.

Messages from the early late access side are the reverse conversion. Therefore, primary late access●
The D channel of interface 23B+D is CCITTI
With protocol according to series Q931, 23
The management of B and the correspondence between each remote subscriber line 2B+D and 23B are performed by the remote subscriber control device 17 using the B channel exchange switch 1.
5.

In this way, ISDN subscribers in remote locations can be multiplexed and accommodated as primary subscribers in an ISDN exchange.

〔Effect of the invention〕

As explained in detail above, the CCITT according to this invention
Recommendation! Integrated service digital network (IS) based on series
A subscriber accommodating ISDN exchange that accommodates ISDN terminals applied to DN) is equipped with a remote subscriber accommodating device that multiplexes ISDN subscribers at a remote location when accommodating ISDN subscribers at a remote location. , 23B10 Primary Late Access If a configuration is adopted to accommodate 23B10 primary late access subscribers, the remote subscriber accommodating equipment includes layer 1 and layer 2 termination circuits of the ISDN subscriber line, a subscriber accommodating ISDN exchange, and the 23B+D primary late access subscriber. ●Equipped with termination circuits for layer 1 and layer 2 of the interface, and by taking precautions to make circuit-switched calls on ISDN subscriber lines in remote locations compatible with circuit-switched calls on the 238+D primary late access interface. IS in remote areas
It is possible to accommodate DN subscribers regardless of the time-division multiplexing degree of the primary group, and the accommodating boat on the ISDN exchange side is also effective in units of ports for 23B+D primary late access.

[Brief explanation of the drawing]

FIG. 1 is a connection configuration diagram showing an embodiment of a remote subscriber accommodating device according to the present invention, and FIG. 2 is a connection configuration diagram showing a conventional remote subscriber accommodating device. 1a and 1b ●●●●Subscriber premises S-interface, 2a & and 2b●●●●ISDN end, 3m> and 3b●●●●Network termination equipment, 4a and 4b ・●・●
Subscriber line, 6 & and 6b ●●●● Primary group interface device, T...●e transmission line, 9e, 9d & and 9e●●
●・Layer 2 termination circuit, 12...●●ISDN exchange,
13・●●●Call Processor, 14m and 14b●
●●●Subscriber line termination equipment, 15●●IIIB channel exchange switch, 16●●●●Interprocess bus, 17●●
●●Remote subscriber control device, 18...◆●Remote subscriber accommodation device. Patent application filed NEC Corporation agent Masaki Yamakawa

Claims (1)

[Claims] In a subscriber-accommodating ISDN exchange that accommodates ISDN terminals applied to integrated services digital networks (ISDN) based on the CCITT Recommendation I series, when accommodating ISDN subscribers in remote areas, ISDN
23, comprising a remote subscriber accommodating device for multiplexing subscribers;
In the case of accommodating as a primary late access subscriber of B+D, the remote subscriber accommodating device is an ISD.
Equipped with layer 1 and layer 2 termination circuits for N subscriber lines, and layer 1 and layer 2 termination circuits for the 23B+D primary late access interface of the subscriber-accommodating ISDN exchange, and is equipped with circuit-switched calls for ISDN subscriber lines in remote locations. 23
A remote subscriber accommodating device characterized in that it is configured to support circuit switched calls on a B+D primary late access interface.