JPS62248338A - D-channel packet processing system - Google Patents

Abstract

PURPOSE:To reduce a load on a central processor, by attaching a tag which represents the physical address of a signal controller by every signal controller at a transfer opposite, on an outgoing packet. CONSTITUTION:When the incoming of a packet using a D-channel is inputted to a packet processing function device PSM14, a central processor CSCP15 teaches device numbers PA1-PA3 of the signal controllers that become paths to incoming data terminals to the PSM14 through a control bus. Local processors LCP12 on the output and input sides of a time division switch TDSW11 transfers the packet autonomously to a line module LM13 using the numbers PA2 and PA1. The LM13 sends the packet to a TA group belonging to a designated physical address using an IEI=127(broadcasting form), and a SPAI=16(packet). In this way, it is enough for the central processor to perform a process to indicate the physical address to a signal transfer device where an incoming terminal is accommodated, to the packet processor.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application on Tumors) The present invention relates to a packet processing method using the D channel, particularly CC1
'rT Recommendation l8L)N (Comprehensive Service Digital Network)
This invention relates to a packet processing method for D channel flights in exchanges used in .

(Prior art) Recently, the development of digital exchanges for 18ON has been progressing, but these exchanges are generally based on time-division switches, with signal control devices installed on the subscriber return side and the trunk line side, and A central processing unit connected to these switches and a signal control device performs switching connection processing. That is, the signal control device sends fs to the control signal tube central processing unit included in the D channel (usually 16 bits/second) within the line, and the central processing unit uses this No. All communication signals (bits per second) are transferred via time-division switches. By the way, the D channel is also used for transmitting and receiving packet signals by utilizing the remainder of control signal transmission and reception, and generally, like control signals, all packets are once transferred to the central processing unit,
Here, this packet is processed during normal line switching equipment and transferred to the outgoing signal control equipment.

(Problems to be Solved by the Invention) However, the above-mentioned packet processing method for D channel flights requires the central processing unit to perform packet processing that is different from this processing in addition to normal circuit switching processing. 5.
Depending on the frequency of use of D channel mail packets, a large load is placed on the central processing.

A problem is that sometimes a very large central processing unit is required.

An object of the present invention is to solve the above-mentioned problems, and to add a channel indicating the physical address of the destination signal control device to the packet signal in the signal control device, so that the packet can be transferred autonomously within the exchange. It is an object of the present invention to provide a packet processing method using a D channel, which reduces the load on a central processing unit by processing packets in nine packet processing units connected to a packet relay system.

(Means for Solving the Problems) The present invention provides that in packet data transfer processing using the D channel of an 18DN switch, an outgoing packet is sent to the signal side (1
A tag indicating the physical address of the transfer destination signal control device is attached to each 1TL device, and according to this physical address, the packet processing function device rc, which is connected to the packet relay system, is transferred fully autonomously within the exchange. The incoming packet is attached with a tag indicating the physical address of the signal control device that accommodates the destination terminal in this packet processing device, and is autonomously forwarded within the exchange to the signal control device that does not accommodate the destination terminal according to this physical address. The packet processing function device is configured to identify the logical channel number t-logical channel number field of the packet and perform packet exchange on a logical channel basis.

With the above configuration, the central processing device does not require any connection processing for sending packets using the D channel, and for incoming packets, it instructs the packet processing device to specify the physical address of the signal transfer device that cannot accommodate one receiving end. It would be a good idea to perform only the processing that is necessary.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention, in which an ISDN exchange is a time division switch, and a signal control device for multiplexing/demultiplexing input/output lines and line control is provided. This shows a case where batch processing is performed by the exchange processing tube central processing unit in the signal control device.

In the figure, an exchange (hereinafter referred to as EX) 1 includes a time division switch (hereinafter referred to as TD8W) 11 that performs channel exchange by exchanging time slots on a plurality of HiQuays, and this TDSW.
A plurality of local processors (hereinafter referred to as LCPs) 12 that transmit and receive highway signals to and from the LCP 12, and a subscriber line connected to the LCP 12, control data transmission from e to r5 to 4, and a large number of line modules (LCPs) LM) 13 and
A packet processing function device (hereinafter referred to as PSM) 14 is connected to a packet switching network (hereinafter referred to as PSDN) 2 and performs sending and receiving of packet signals with a specific LCP 12, and a packet processing function device (hereinafter referred to as PSM) 14 is connected to each functional device in the above communication 2s- via a bus and performs exchange processing. The central processing unit fi1 (hereinafter referred to as C8Cf') 15 and 1 performs the following.

In the figure, a plurality of data terminal equipment (hereinafter referred to as DTE) 32 are connected to the LM 13 and connected to nine subscriber lines via a line termination circuit (hereinafter referred to as NT) 31t.
A) Connected via 33i, and further connected via LCP12
High-speed data subscriber's high-speed terminal J'1t (J, i lower HD
I) 4 is directly connected to the P8M14 to the packet terminal equipment (hereinafter referred to as PTE) 5 of the packet subscriber.

21ffl is a packet format diagram for use of the D channel between each functional device in FIG. 1, and FIG.
2 digit c between TE32 and Ti2B (point A in the figure)
The format is according to cITT Excitation X, 25. Second
Figure (b) is between Ti2B and NT31 (point B in the figure)
In the 7 format diagram according to CCITT Recommendation 1.440, the value of 5PAI is 16, which is a packet data transfer service according to the recommendation, and 'f'E
For I, a value j constant is used by the LM13. FIG. 2(C) is a format diagram between LM13 and LCP12 (point C in the figure).

Figure 2 (Connection engineering 7 point suffix (hereinafter referred to as CEP) corresponding to the device number of the information department indicated by PKT in BL and the connection point suffix (hereinafter referred to as CEP) connected to LM12. (hereinafter referred to as PA1) is added, and '
I'EI is the TEI specified by L CPI3.

is used. Figure 2(d) shows LeP12 and TDS
In the format diagram between wn and (dotted point in the diagram).

In addition to PAl in the format of Figure 2 (C), LC
Connect to Pi2, LMH module number C or lower PA,
) is added, and the TEI is TEi specified by Peace LCP12. @2nd $(e) is LP
This is a format diagram between CI2 and P8M14 (point E in the figure), and P in the format of Figure 2(b).
A. In addition to the FA, the previous LCP via TDSWIIt-
12 device number (hereinafter referred to as PA) is added, and '1'EI
TEI4 specified by PSM14 is used. Figure 2 (fl) IDTE4 and LPCI
2 (point F in the figure).
The format is the same as in Figure (b), but LPCI2 is used for 'I'EI.
TEI,' specified by TEI,' is used.

FIG. 2(g) is a format diagram between PSM14 and P'rE5 (point G in the figure), and is exactly the same as FIG. 2(a).

FIG. 3 is a sequence diagram when the PSM 14 of FIG. 1 receives a packet using the D channel. In the following, this sequence will be explained with reference to FIG. 2. First, PSM14 sends an incoming call packet (X
, 25ON) @ When received, PSM14 is C3CP15
The device numbers PA1, FA, .
A. t-Tell me. The PSM 14 then sends out the message using the tD channel. Therefore.

TI) SWII's output side 2 and input side LCP12 are PA
This packet is autonomously LMed using Yuki PA1's number.
Transfer to 13. During this time, as shown in FIGS. 2(d) and 2(C), FA numbers that are no longer needed are sequentially deleted. Next, the LM13 that received the packet in the format shown in Figure 2(C) sends an IE to the TA group belonging to the specified physical address
I=127 (broadcast format), 5PAI=16 (packet) The gold side sends a packet in the format shown in Figure 2 (1)). Therefore, TiB2 receives the terminal attribute number, checks it with its own attribute, and if the compatibility check is established, it performs the packet using the tD channel, but it sends a call establishment response message to determine whether to use the B channel or not. report to LM13. Next, in the call establishment response message from fcTA33 in response to LM13Fi, a CH3I that identifies the terminal is defined and added to the information section along with the forwarding destination PA1 as shown in FIG. Send. Thereafter, the call establishment response message is autonomously transferred to the PSM 14, contrary to the establishment request message. Then, from this call establishment response message, the PSM 14
Knowing that TiB2 is requesting a packet on the D channel, the forwarding of packets with this logical channel number within the switch will be performed with the addition of the above CES, PAl, FA, and FA. Done, DTE3
The procedure between PSM14 and CCITT Recommendation X, 25
Then, when P8M14 detects a message indicating the end of packet communication (R, X25CLC in the figure)'.

A recovery message (P, RLS in the figure) is also sent to the t-LM13 via the D channel. Therefore, LM13 first deletes 7jCES and sends a recovery completion message (P, RL8 CM in the figure)'j-D channel to PSM1.
Send to 4.

FIG. 4 is a sequence diagram when a packet using the D channel is transmitted from one of the DTBs 32 shown in FIG.

This sequence will be explained below with reference to number 21. First, when the DTE 33 gives a calling bucket in the format of FIG. 2(a) to the TA 33 connected to
In order to inform the PSM 14 of all attributes of the terminal, the iB2 sets this attribute number in the user data field of this packet and sends it to the LM 13. Next, the fcLM 13, which handles all calling packets for this D channel flight, adds CES and PA to this packet and sends it to the LPC 12. As in the case of FIG. 3, this packet is sequentially appended with PA*Pk@ and transferred to PSMI 4. Therefore, the PSMI 4 subsequently receives packets with this logical channel number with C E 8 and P At added.

The PA and PA perform all transfers within the exchange as t-tags. The following packet processing procedure between 14D'l'E32 and PSMI4 is performed in accordance with CCITT Recommendation X, 25. Next, when the PSMI 4 receives a packet communication termination confirmation message (p,
LS) Send to tl-LM13 using the D channel as well. Therefore, LM13 deleted all the CES that was set at the beginning,
A recovery completion message (hole in the figure, RL8 CM) is sent to PSMI4 using the t-D channel.

(Effects of the Invention) As explained in detail above, 1. According to the present invention, in an incoming packet, when a call is received, only the central processing unit notifies the destination terminal device of the transmission signal control device number, and Since packet processing for D channel flights can be performed without requiring any intervention by the central processing unit at the time of call origination, the load on the central processing unit can be significantly reduced.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a simple embodiment of the present invention, and FIG. 2 is a block diagram of a first embodiment of the present invention.
3 is a sequence diagram of incoming packets using the D channel in Figure 1, and Figure 4 is a sequence diagram of outgoing packets using the D channel in Figure 1. Illustrated. 1...ISDN exchange 1d (EX), 2...
...Packet switched network (PSDN), l1...
Time division switch (TDSW input) 12... Local processor (LCP), l 3... Line module (LM), 14... Packet geography function table - ()'SM ), 32... Data terminal device m
(DTE). 33...0 circuit with terminal (TA).

Claims (1)

[Claims] In packet data transfer processing using the D channel of an ISDN exchange, an outgoing packet is attached with a tab indicating the physical address of the destination signal control device for each signal control device, and is sent to the exchange according to this physical address. The incoming packet is autonomously transferred to the packet processing function device connected to the packet relay system, and the incoming packet is attached with a tag indicating the physical address of the signal control device that does not accommodate the destination end in the packet processing function device. The packet is autonomously transferred within the exchange to a signal control device that does not accommodate the destination end according to the physical address, and the packet processing function device identifies the logical channel number of the packet from the logical channel number field and performs packet switching on a processing channel basis. Packet processing method using the D channel.