JPH01143444A - Multiplexing/demultiplexing processor - Google Patents

Abstract

PURPOSE:To attain transmission/reception to a subsequent communication terminal equipment corresponding to the identifier of a communication terminal equipment or the like by inserting the identifier to the frame of a D-channel packet. CONSTITUTION:A subscriber's equipment identifier representing separately respectively subscriber's equipments 11-1-and a network termination identifier representing a network termination 15 are inserted to the head of an I frame of a D-channel packet, the packet is transferred by an LAPD packet link 22 and received by a packet bundler 23. The packet bundler 28 identifies from which subscriber's equipment the packet is sent depending on the subscriber's equipment identifier, the network termination identifier, a digital subscriber line accommodating equipment identifier included in the received D-channel packet and the accommodated location of the LAPD packet link 22. After the identification, the D-channel packet is sent back to a primary group interface accommodating device 19 by the LAPD packet link.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a multiplexing/demultiplexing processing device that performs communication processing of signal channel packets used in an integrated service digital network I5DN.

[Conventional technology]

The communication terminal is configured to send and receive predetermined information in the form of electrical signals to and from the other party's communication terminal via a communication network during boat fishing. When transmitting and receiving electrical signals between multiple communication terminals, procedural rules for transmitting and receiving are required. This rule is called a communication network interface, and includes communication networks such as analog telephone networks and data communication networks. Recently, a comprehensive service digital network I has been developed that can improve the convenience of multiple communication between telephone and non-telephone information.
S D N ([integratedService
s Digital Network) was proposed, and the Consultative Committee for International Telegraph and Telephone (CCITT) proposed a basic standard for data exchange using digital-to-analog conversion transmission between communication terminals and exchanges.
It recommends access methods (CCITT I series).

The I series is based on transmitting voice at 64 kilobits/second (B channel; information channel), other data etc. at 64 kilobits/second, and control information at 16 kilobits/second (D channel; signal channel). The information transmission rate of the digital subscriber line is defined as 144 kilobits/second (64+64+16 kilobits/second) ("2B+D" channel system).

Conventional multiplexing/demultiplexing processing equipment uses terminal equipment identifiers T E I (Terminal
Identifier) and an information type identifier indicating the type of information to be transferred.
Access Point Identifier)
A sharp vignetting tail.

Among these, the home equipment identifier is an identifier added to each of a plurality of subscriber lines. Other information type identifiers are called service access points, for example, 5API
When =O, a communication link is specified, when 5API=16, a D packet is specified, and when SAP I=62 or 63, maintenance is specified.

A communication link (connection line) is formed between a plurality of home devices and the network using a plurality of bus wirings using the same basic access interface. This communication method is L A P D (Link＾access P
rocedure On The Low Channel)
This is called the layer 2 multiplexing method. LAPD is
This is a method that connects multiple subscriber lines through communication links, and D channel packets are used for the packets. Other LA
P B (Link Access Procedure
There is a system called ``re On The B-Channel'', in which one subscriber line is connected by one communication link, and multiple control is not performed. A B channel packet is used for the packet. L.A.
When transferring packet information using the PD method, if maxi-in grayion, that is, non-telephone information is specified, a packet pandora (packet switch) in the network is accessed.

[Problem that the invention seeks to solve]

The problem with the conventional LAPD layer 2 multiplexing method is that the number of communication links connecting multiple home devices and packet pandora in the network increases as the number of digital subscriber lines increases.

Furthermore, in the conventional multiplexing/demultiplexing processing apparatus, the communication link connecting a plurality of household devices and the network is compatible only with the LAPD system. Therefore, in order to support the LAPB system, an LAPD/L8FB protocol converter or an LAPD/IOC to Packet Pandora is installed within the network so that communication can be performed with the designated digital subscriber line.
S (Input Control Sy
stem) must be provided. This necessitates a control program for controlling the above-described device.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a multiplexing/demultiplexing processing device that can reduce the number of communication links as much as possible even when the number of digital subscriber lines increases, and can also support both LAPD and LAPB systems. There is a particular thing.

[Means for solving problems]

The present invention provides (i) a plurality of lower-level communication terminals, (ii) a bus wiring that connects these lower-level communication terminals with one bus, and (iii) a plurality of lower-level communication terminals that identify each of these lower-level communication terminals. (iv) digital subscriber line accommodating means for accommodating signal channel packets into which terminal identifiers have been inserted from the bus wiring to digital subscriber lines designated as predetermined channels; and (iv) these sent out from the digital subscriber line accommodating means. primary group interface accommodating means for accommodating signal channel packets into a predetermined channel interface from the digital subscriber line into which a lower-level communication terminal identifier and a digital subscriber line accommodating means identifier for identifying the digital subscriber line accommodating means are respectively inserted; and (V) packet switching means for time-divisionally transmitting the signal channel packets accommodated in the primary group interface accommodation means through one connection line.

That is, the present invention accommodates a signal channel packet, that is, a D channel packet in which a lower-level communication terminal identifier for identifying a desired lower-level communication terminal is inserted into the frame of the signal channel packet, by the digital subscriber line accommodation means or the primary group interface accommodation means. Ru. Therefore, by using these lower communication terminal identifiers inserted into received signal channel packets, it is possible to identify whether the signal is transmitted from a lower communication terminal such as a desired in-home device, that is, to perform demultiplexing.

〔Example〕

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

FIG. 1 shows the configuration of a D channel packet multiplexing/demultiplexing processing device according to an embodiment of the present invention. Multiple in-house devices 11-1, . . . are bus wiring 1
2 are connected to each other. The household device 11-1 includes a terminal adapter 13 connected to the bus wiring 12 and a data terminal 14 connected to the terminal adapter 13.

The bus wiring 12 includes a plurality of digital subscriber lines 16-L designated as "2B10" channels via the ml end 15.
. . . , 16-n are connected to each other. These digital subscriber lines 16-1, ..., 1
6-n respectively have in-house devices 11-1, . . .
and D channel packets in which an identifier indicating the network termination 15 is inserted into the frame are transferred and accommodated in the digital subscriber line accommodation device 17, respectively.

The D channel packet accommodated in the digital subscriber line accommodation device 17 is a “23B+D” channel or a “30B
+D” channels (sent to D-order W interfaces 18-1, 18-n,
It is accommodated in the primary group interface accommodation device 19. The primary group interface accommodation device 19 is connected to a packet pandora 23 by one LAPD packet link 22 via a time division network 21 .

FIG. 2 shows the structure of a frame of a D channel packet accommodated in the digital subscriber line accommodation device shown in FIG. This will be explained in conjunction with FIG. D channel packets (not shown) transmitted from the home devices 11-1, . . . are sent via the network termination 15 to the digital subscriber lines 16-1, . Of these,
Digital subscriber line accommodation device 17 according to the D channel of the digital subscriber line designated as "2B+D" channel
will be forwarded to.

■Frame 25 of the D channel packet accommodated in the digital subscriber line accommodation device 17 is an "X25" packet (
Level 3) consists of 26. D channel packet! At the beginning of the frame 25, the home equipment 11-
1. . . . and a network termination identifier 28 indicating the network termination 15 are inserted. The D channel packet into which these identifiers are inserted is a plurality of primary group interfaces 18-L..., 1
8-rl, “23B+D” channel or “30
The data is transferred to the D channel of the primary group interface designated as the "B+D" channel and accommodated in the primary group interface accommodation device 19.

FIG. 3 shows the structure of a frame of a D channel packet accommodated in the primary group interface accommodation device shown in FIG. This figure will be explained together with FIG. 1. At the beginning of the I frame 31 of the D channel packet accommodated in the primary group interface accommodation device 19, in addition to the identifier inserted in the above-mentioned I frame 25, the digital subscriber line 16-1, . . . , 16-n, respectively, are inserted.

Therefore, the D channel packet into which the home equipment identifier 27, the network termination identifier 28, and the digital subscriber line accommodation device identifier 32 are respectively inserted is transferred by the LAPD packet link 22 and received by the packet pandora 23.

Packet Pandora 23 uses the home equipment identifier 27 and network termination identifier 28 included in the received D channel packet.
and digital subscriber line accommodation device identifier 32, and further L.
Based on the accommodation position of the APD packet link 22, it is possible to identify which in-home device the packet originated from. After this identification, the D-channel packet is
The packet link 22 sends it back to the primary group interface accommodation device 19 . The returned D channel packet is sent to the primary group interface 18-1, . . .
..., 18-n, and sent back to the digital subscriber line accommodation device 17 corresponding to the digital subscriber line accommodation device identifier 32 inserted here. In the digital subscriber line accommodation device 17, the digital subscriber line accommodation device identifier 3 inserted into the ■frame 31 of the D channel packet.
2 is deleted and transferred to the network terminal 15 as an I frame 25 of the D channel packet.

At this time, the D channel packet is
The data is transferred to the network end 15 corresponding to the network end identifier 28 included in the network end identifier 28. At the m terminal 15, the D channel packet! After deleting the network termination identifier 28 inserted into the frame 25, the home equipment 11 corresponding to the home equipment identifier 27 remaining at the end
-L... is transferred. As a result, the D channel packet is sent to the predetermined home equipment 11-1 as an I frame containing only the "X25" packet (level 3) 26.
A call is received on...

〔Effect of the invention〕

As described above, according to the present invention, since the identifier of the lower-level communication terminal, etc. is inserted into the frame of the D-channel packet, it is possible to transmit and receive data to the lower-level communication terminal corresponding to this identifier. This allows the packet switch to transmit and receive D channel packets using fewer communication links than the number of digital subscriber lines accommodated. Therefore, the reliability of the subscriber line accommodating device that accommodates subscriber lines accessed by Packet Pandora can be improved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a D channel packet multiplexing/demultiplexing processing device in an embodiment of the present invention, and FIG. 2 is a block diagram showing the configuration of a D channel packet multiplexing/demultiplexing processing device according to an embodiment of the present invention. FIG. 3 is a frame structure diagram showing the structure of a D channel packet frame accommodated in the primary group interface accommodation device shown in FIG. 1. FIG. 11-1... In-house equipment, 12... Bus wiring, 17... Digital subscriber line accommodation device (digital subscriber line accommodation means), 19... - Primary group interface accommodation device (primary group interface accommodation means), 23...Packet Pandora (packet exchange means).

Claims (1)

[Claims] A plurality of lower-level communication terminals, a bus wiring connecting these lower-level communication terminals with one bus, and a signal channel into which a plurality of lower-level communication terminal identifiers for identifying each of the lower-level communication terminals are inserted. digital subscriber line accommodating means for accommodating packets from the bus wiring to a digital subscriber line designated as a predetermined channel; and the lower communication terminal identifier and digital subscriber line accommodating unit sent from the digital subscriber line accommodating means. a primary group interface accommodating means for accommodating signal channel packets each having a digital subscriber line accommodating means identifier inserted therein from the digital subscriber line to a predetermined channel interface; A multiplexing/demultiplexing processing device comprising: packet switching means for time-divisionally transmitting the signal channel packets through one connection line.