JPS62281649A - Transfer system for packet information - Google Patents

Abstract

PURPOSE:To decentralize the load of a central processing unit by processing both the control information and the packet information on a channel D through only one of duplex central processing units when other unit has a fault although both processing units usually process the control information and the packet information respectively. CONSTITUTION:When a switching device EM4 detects the fault of one of both control systems, the EM4 gives an instruction to a nondefect CPU to process both the exchange control information and the packet information on a channel D. While said instruction is given to a subscriber circuit device LC2 and a packet network connection circuit PT15 from a nondefective CPU. Thus the CPU to be transferred is known. The D channel information received from a digital subscriber circuit is separated by a channel separation/merger circuit 21. If SAPI = 16, for example, is detected by an identifying circuit 22, this detection signal is sent to an information transfer circuit 23 and the D channel information is sent to a CPU131 as the packet information on the channel D.

Description

Detailed Description of the Invention λ Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a packet information transfer system using the D channel, and particularly to a D This invention relates to a packet information transfer method using channels.

[Conventional technology]

Conventionally, electronic exchanges are composed of communication line system equipment and control system equipment, and even if the control system equipment is duplicated to improve reliability, the communication line system equipment is rarely affected by failures that affect all calls. Many have only one set because they don't have a lot of time. In this case, in general, one system of the dual control system equipment is put into operation, the other system is put into standby state, and the system in standby state is always checked for health to confirm its normality. are doing. Therefore, when a failure occurs in the operating system, the standby system is immediately switched to the operating system under instructions from a switching instruction device provided in common to both systems. This duplexing method is exactly the same in recent IaDN exchanges, and normally the control system equipment in the operating state performs all switching processing, including the transfer processing of packet information using the D channel, and controls the operating state. When a device fails, the control system device in the standby state is switched to the active state and performs all exchanges and packet processing.

[Problem that the invention seeks to solve]

However, although the transfer processing of packet information using the D channel in the above-mentioned I5DN switch has a lower priority than switching control information that also uses the D channel, it requires a large amount of processing in the control system equipment, especially the central processing unit. There are problems in that the transfer processing of a large number of packets and information using the D channel delays the processing of exchange control information and requires a large amount of central processing equipment.

An object of the present invention is to eliminate the above-mentioned problems, and to separate control information and packet information of the D channel in a subscriber line device provided at the connection part of the communication path system device to the subscriber line, and to separate the control information from the packet information. is processed by one control system device, and packet information for use of the D channel that is unrelated to the communication path switch is processed by the other control system device, making effective use of the control system device that was previously in a standby state. The object of the present invention is to provide a method for transferring packet information using the D channel.

[Means for solving problems]

The present invention provides an 15DN switching system having dual central processing units and subscriber line equipment connected to both central processing units via their respective buses. Normal C
An identification means for identifying the CITT-recommended SAP value "16") is also provided in the subscriber line equipment, and normally sends and receives D channel control information to and from one central processing unit according to the output of the identification means. Packet information using the D channel is sent to and received from the other central processing unit, and when one central processing unit has a failure, all information on the D channel is sent to and received from the other central processing unit. Normally, one of the dual central processing units is used to process control information for the D channel, and the other is used to process packet information for the D channel. In the event of a failure, the other central processing unit is configured to include instruction means for instructing the other central processing unit to process both the control information of the D channel and the packet information for use of the D channel.

With the above configuration, the central processing unit, which has conventionally been used as an active system to perform exchange processing of the communication path system including the communication path switch and processing of packet information using the D channel, can be used for processing packet information using the KD channel. Since packet information using the D channel is processed, the load on the central processing unit is distributed, and there is no need for complicated control such as controlling a communication path switch from both central processing units.

〔Example〕

Hereinafter, embodiments 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, showing an I5DN switching system in which control system devices are duplicated. This exchange includes a communication path switch (hereinafter referred to as 5W) 1, a subscriber line equipment (hereinafter referred to as LC) 2, duplexed O-system and I-system central processing units (hereinafter referred to as CPUo and CPU1) 30 and 31, and a switching instruction circuit (hereinafter referred to as LC) 30 and 31. EM) 4 and a packet network connection circuit (PTI) 5, the SWI accommodates a large number of LC2s, PTIs 5, and a plurality of trunk devices (not shown), and the 8Wl and LC2 have a CPU 0.
30 and CPU131 via respective channel devices, CPU030 and CPU030 are connected to EM
Connected to 4.

Figure 2 is a block diagram of the LC2 in Figure 1, which separates D channel information from digital subscriber line information, and 8W
A channel separation/merging circuit 21 that merges D channel information with B channel information from the digital subscriber line, and an identifier (, SAP
When the value of I) is ``16'', it is used as packet information for use of the D channel, and when 5API is other than 116'', it is used as control information for the B channel.The identification circuit 22 uses the D channel information from the digital subscriber line. In response to an instruction from the identification circuit 22, the control information is transferred to one of the CPUs previously specified by the CPU.
For example, the packet information for use of the D channel is transferred to the CPU 131, and the packet information is transferred to the CPU 030.
and an information transfer circuit 23 which supplies D channel information from the CPU and 31 to a channel separation/merging circuit. Note that when one of the CPUs is faulty, the information transfer circuit 23 transfers information only to the other CPU that is designated by the CPU and is not faulty.

The operation of the present invention will be explained below with reference to FIGS. 1 and 2.

First of all, when 8M4 has both control systems normal, one CP
For example, the CPU 630 performs exchange control processing mainly controlling SW1, and the other CPU 131 is given an instruction to process packet information using the D channel. This instruction is given to the PTI5 via the LC2 and channel devices via the O-system and 1-system buses, respectively, and the LC2
and packet information using PTI 5HD channel is C
Knows what should be transferred to the PU 131. Furthermore, when the 8M4 learns that one of the control systems has failed, it instructs the non-faulty CPU to perform both exchange control processing and packet information processing using the D channel, and sends the non-faulty CPU to the LC2 and PTI5 respectively. , the %CPU to be transferred is informed by giving that instruction.

Therefore, the D channel information from the digital subscriber line is separated by the channel separation/merging circuit 21, and the D channel information from the digital subscriber line is separated by the identification circuit 22.
When 5API=ゝゝ16'' is detected, this signal is given to the information transfer circuit 23 and this D channel information is transferred to the D channel information.
As packet information for channel use, CPU 13 of system 1
Transferred to 1.

The CPU 31 processes this packet, and if it is for a subscriber accommodated in the same exchange, it is transferred to the LC2, and if it requires relaying, it is sent to the packet network via the PTI 5'. . In the above, the identification circuit 22
Information packets whose 8API is not XX16 // are transferred to the CPU030 as exchange control information, and
The exchange process will be carried out at .

Next, when a call setting packet enters the PTI 5 from the packet network, the PTI 5 first sends this call setting packet to the CPU 31. The CPU 131 sends a call setting packet to the terminating subscriber's terminal equipment via the LC2.

If a response indicating that the D channel can be used is received, processing of this series of packets can be continued by this CPU+31. There's nothing to do. However, the CPU 31 is
When the CPU 131 receives a response indicating that it wants to send and receive packets using the channel, the CPU 131 instructs the PTI 5 to retransfer this call setting packet to the CPU 030, and also sends the requested v/l packet to the subscriber terminal device. (recovery bucket) Perform recovery processing from all senders. Thereafter, this incoming packet is processed by CPU+31.

〔Effect of the invention〕

As explained in detail above, in the present invention, one of the duplexed control system devices normally performs exchange processing related to communication path switching, and the other side processes packet information using the D channel. This has the effect that system equipment can be used effectively. Note that the central processing unit is originally designed to be able to perform normal processing, so if one of the control system devices is unavailable due to a failure, the other system can perform all processing, and packet information using the D channel can also be processed. When the processing in the central processing unit designated to process the packet is full, the packet must be forwarded to the central processing unit designated for switching control even if the value of 5API is "16" in the subscriber line equipment. This has the effect that it can be processed easily. Further, although the present invention has been explained using D channel packets, it goes without saying that packet information using an out channel can be handled in exactly the same way.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of one embodiment of the present invention, and FIG. 2 is a block diagram of an embodiment of the present invention.
FIG. 1022 is a diagram of the subscriber line equipment shown in FIG. 1...Call path switch (SW), 2...
・Subscriber line equipment (LC), 4...Switching instruction circuit (EM), 5...Packet network connection circuit (PT)
i), 21... Channel separation/merging circuit, 22
...Identification circuit, 23 ... Information transfer circuit, 30.31 ... Central processing unit (CPU0.C
PU1). Thing 1 Leap 2 Bacteria

Claims (1)

[Claims] In an exchange having dual central processing units and subscriber line equipment connected to both central processing units via respective buses, identification means for identifying D channel usage packet information in the subscriber line equipment; It is provided in the subscriber line equipment and normally sends and receives control information for the D channel to and from one central processing unit according to the output of the identification means, and sends and receives packet information for use of the D channel to and from the other central processing unit. If one central processing unit has a failure, all the information on the D channel is sent to and received from the other central processing unit, and normally one of the duplexed central processing units has a D channel. However, if one central processing unit has a failure, the other central processing unit will process the control information of the D channel and the packet information of the D channel. 1. A packet information transfer method comprising: an instruction means for performing processing of both the packet information and the packet information.