JPS62180639A - Packet traffic multiplexing system in isdn - Google Patents

Abstract

PURPOSE:To efficiently process packet traffic by using a frame multiplexer to apply line concentration to the packet traffic incoming from plural subscribers. CONSTITUTION:In the system multiplexing the packet traffic for a D channel of a digital integration service network ISDM 4, the D channel packet traffic is subjected to line concentration by a frame multiplexer 11, an address field of a D channel link layer is converted by the frame multiplexer 11 to inform a subscriber line number of a terminal equipment to a packet handler 3, which checks the congestion state of the frame multiplexer 111 and the permanent path relating thereto. Since data is transferred multiplexedly to the permanent path 2 in spreading the permanent path 2 on the packet handler 3, the number of ports of the packet handler PH is reduced and the data processing efficiency of the using path is improved.

Description

[Detailed Description of the Invention] [Summary] This is a packet traffic multiplexing method that attempts to process packet traffic efficiently by concentrating packet traffic arriving from multiple subscribers using a frame multiplexing device. be.

[Industrial application field]

The present invention relates to a packet traffic multiplexing method, particularly a 13D
Fewer/lower speed D in N (digital integrated service W4)
The present invention relates to a packet traffic multiplexing method that concentrates channel packet traffic and processes it efficiently.

In the future, the telephone communication network will be integrated
ed ServicesDigital Netgaor
k) is planned to be constructed by As is well known, 15DN is an attempt to integrate telephone, telegram, telex, facsimile, data communication, etc. into one digital communication network.

And this l5DN (digital integrated service w4)
has two channels, a B channel and a D channel, and the D channel is for information transfer for controlling signals and for packet traffic.

The present invention relates to a D channel packet traffic multiplexing method in such an I5DN.

[Conventional technology]

Conventionally, as an international standard, D channel packet traffic in 15DN is handled by a packet handler (PH).
Only the conceptual aspects such as installing in the 5DN and inputting packet information in the D channel to it are specified, and the detailed implementation method needs to be decided by the manufacturer.

[Problem that the invention seeks to solve]

However, simply terminating the D channel bucket of each subscriber line individually at the packet handler PH has the problem that the processing efficiency of conversational data decreases and the number of terminal ports of the packet handler PH increases. was there.

[Means for solving problems]

An object of the present invention is to solve the above-mentioned problems and to improve data processing efficiency by concentrating D channel packet traffic in an SDN and transferring it to a packet handler.

As shown in the principle diagram of the present invention in FIG.
The packet handler PH is configured to uniformly execute link layer and packet layer termination for D channel packets in order to insert the .

[For production]

As described above, according to the present invention, if the permanent bus 2 is connected to the packet handler 3 by providing a paget traffic multiplexing device, data can be multiplexed and transferred to the permanent bus 2.
It becomes possible to reduce the number of ports on the H side, and it becomes possible to improve the data processing efficiency of the bus used.

〔Example〕

The invention will now be explained by way of example with reference to the accompanying drawings.

FIG. 2 is a diagram showing an embodiment of the present invention.

The device in FIG. 2 includes a packet traffic multiplexing bag fil permanent bus 2, a packet handler 3, a packet line 4
It is composed of.

The input side of the packet l-1-rahic multiplexer W1 is provided with m network termination devices (NT) 51...5m, and the output side is provided with n permanent buses 2. Terminal (TE) 611...61n...6
ml...6mn is connected.

The packet traffic multiplexing bag W1 includes a digital subscriber circuit (DLC) 11...Ims frame multiplexing device (
FMX) 111, central processing unit v (cpU) 112, and line concentration time switch (LTS) 113.

The digital subscriber circuits 11...1m perform terminating of the digital subscriber lines, such as converting data from unipolar to bipolar or vice versa, and supplying power to each network termination device (NT) 11...1m. .

Frame multiplexing bag? &111 determines which permanent bus should be used by the packet handler 3, and performs frame multiplexing of D channel packet traffic on the determined bus.

The line concentration time switch 113 performs switch control for the determined permanent bus.

The central processing unit 112 implements the I5ON protocol, that is, the I5ON protocol.
It executes communication rules from connection to disconnection of lines between each SDN device, and controls the frame multiplexing device 111.

The functions of the above-mentioned terminals, network termination equipment, and packet controllers are based on the recommendations of the CCITT (International Telegraph and Telephone Consultative Committee).

The operation of the apparatus shown in FIG. 2 having the above configuration will be explained below.

First, D channel packets sent from the network termination bag W (NT) 51...5m of each terminal are input to the frame multiplexer W 111 and concentrated into 64 Kb as shown in the figure.
It is determined which permanent path of the ps is to be used and multiplexed onto the corresponding path.

On each subscriber line at the input end of the packet traffic multiplexer 1, the available line bit rate for the D channel bucket is 16 Kbps in one direction.

Therefore, the maximum packet traffic of 16 KbpsXm corresponds to m network terminal devices 51...5m and becomes 64 Kbps.
The lines will be concentrated to the permanent path of Xn.

In this case, in order to reduce the load on the packet traffic multiplexer, the linter level and packet level processing, including flow control, are performed all at once by the packet handler, and the packet traffic multiplexer simply processes the D channel and packet multiplexing. Perform only conversion.

For this reason, so that the packet handler 3 can identify the terminal, the frame address field ( 3(A)) is converted as shown in FIG. 3(B). Third
Figure (A).

In (B), 5API (P) indicates a service access point identifier, C/R indicates a command/response, EA indicates an address octet sequence, and TEI indicates a terminal device identifier. That is, FIG. 3(A) is CCITTl, 440
This format is specified in the format shown in FIG. 3(A) from the terminal to the digital subscriber circuit 11...1m.
...1m and the frame multiplexer 111 in Fig. 3 (B
), the subscriber line number is notified to the packet handler 3 in this format. That is, the service access point identifier 5API (P) is converted into a subscriber line number.

Furthermore, the frame multiplexing device 111 maintains a buffer capacity sufficient to withstand even when the access traffic suddenly increases until the flow control of the bucket handler 3 is performed.

Further, on the packet handler (PH) 3 side, the following logic is used to grasp the congestion status of the permanent path, and when the threshold is exceeded, flow control is executed.

Specifically, an RNR frame is returned to all calls related to this permanent path 2.

Furthermore, in order to minimize the probability of data loss, PMXI
I checks the buffer usage status and, if it exceeds the dark value, makes a flow control request to the packet handler.

Furthermore, in order to efficiently use the permanent path 2, the following should be considered.

A main permanent path is selected for each subscriber line and this path is normally used. Next, when the usage rate of this main permanent path exceeds a certain darkness value, another path with the least load is determined and used.

〔Effect of the invention〕

As described above, according to the present invention, by providing a packet traffic multiplexing device and establishing a permanent path 2 to the packet handler 3, data can be multiplexed and transferred to the permanent path 2, so that the data can be transmitted more efficiently than before. Processing efficiency has been improved. Furthermore, by terminating the link level and packet level at the packet handler, it has become possible to reduce the load on the packet traffic multiplexing device.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the principle of the present invention, FIG. 2 is a diagram showing an embodiment of the present invention, and FIG. 3 is a diagram showing frame address field conversion according to the present invention. DESCRIPTION OF SYMBOLS 1...Packet traffic multiplexer, 2...Permanent path, 3...Packet handler, 4...Packet network, 11...1m...Digital subscriber circuit, 111.
...Frame multiplexing device, 112...Central processing unit, 113...Line concentration time switch, 51...5m...Network termination device, 611...61n...6ml l...6mn・・・
・Terminal.

Claims (1)

[Claims] In a method for multiplexing packet traffic for D channel of an integrated services digital network (ISDN) (4), the D channel packet traffic is concentrated by a frame multiplexing device (111), and the frame multiplexing is performed. converting device (111) converts the address field of the D channel link layer and notifies the packet handler (3) of the subscriber line number of the terminal, and the packet handler (3) converts the address field of the D channel link layer and notifies the packet handler (3) of the frame multiplexing device (111).
A packet traffic multiplexing method characterized by checking the congestion status of permanent paths related to the packet traffic multiplexing method.