JPH0720138B2 - Port accommodation method - Google Patents

Description

The present invention relates to a port accommodation system, and more particularly to a port accommodation system in a packet switch in ISDN.

[Conventional technology]

In a conventional packet switch, each channel through which a packet passes is fixedly assigned to a specific port.

[Problems to be solved by the invention]

In the conventional packet switch described above, each channel is fixedly assigned to a specific port, so that between two ports accommodating two channels for which a virtual call is set, there is a multistage frame buffer inside the packet switch. However, there is a disadvantage in that the delay of the packet in the switch becomes large when the connection is established.

[Means for solving problems]

The port accommodation method of the present invention groups ports for processing B or D channel packets in ISDN,
Connect ports in the same group to each other via the first bus,
A plurality of the first buses of the plurality of groups are connected by a second bus via a first frame buffer to form a super group, and further, a plurality of the second buses of the plurality of super groups are connected to each other. Between the two unused channels, a packet switch having a configuration for repeating connection with the third bus via the second frame buffer and a circuit switch installed in the preceding stage of this packet switch are provided. To accommodate these two channels when setting up a virtual call for
Assign two ports to the same group, and when setting up a virtual call between an unused channel and an unused channel, assign the port that accommodates this unused channel and the port that accommodates the unused channel to the same group. It is characterized by attaching.

〔Example〕

 Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the port accommodation system of the present invention.

In FIG. 1, a circuit switch 10 is installed in front of the packet switch 20, and the circuit switch 10 accommodates channels 1 to 8 through which B or D channel packets pass (hereinafter referred to as CH _B or CH _D ). There is. The switch control unit 30 gives a predetermined command to the circuit switch 10 and the packet switch 20 based on a notification by a channel (hereinafter referred to as CH _S ) 9 through which D channel signaling passes. Packet switch
20 is a port for processing B or D channel packets
210, to 213 are connected to each other via a bus 230 to form one group, ports 220, to 223 are connected to each other to a bus 231 to form another group, and the buses 230 and 231 are connected to the bus 250 via the frame buffers 240 and 241 respectively. They are connected to form one super group, which is a so-called two-stage group.

Next, the operation of this embodiment will be described.

For example, when a packet call is issued from CH _B 1 logical channel “0” to CH _B 2, CH _S 9 causes switch control unit 3
Since it is notified to 0, if both channels are unused, the switch control unit 30 recognizes that, hunts unused ports 210 and 211 belonging to the same group, and CH _B 1,2 to each port 2
A command to connect to 10,211 is issued to the circuit switch 10. Subsequently, the switch control unit 30 gives information for packet exchange to the ports 210 and 211, and the packet of the logical channel “0” received by the port 210 is input to the logical channel “0” of the port 211 and the logical channel “0” received by the port 211. Packets of "0" are transferred and transmitted to the logical channel "0" of the port 210 via the bus 230, respectively.

Subsequently, for example, when a packet call from CH _B 8 logical channel “0” to CH _B 2 is issued, CH _S 9 notifies switch control unit 30, so that CH _B 8 may be unused. For example, the switch control unit 30 recognizes it, hunts an unused port 212 belonging to the same group as the port 211 accommodating CH _B 2 and issues a command to the circuit switch 10 to connect CH _B 8 to the port 212. . Then, information for packet exchange is given to the ports 211 and 212, the packet of the logical channel "1" received by the port 211 is sent to the logical channel "0" of the port 212, and the packet of the logical channel "0" received by the port 212 is sent to the port. They are transferred to the logical channel “1” of 211 respectively via the bus 230 (without passing through the frame buffers 240, 241, and 250) and transmitted. Therefore, the port
211 indicates packet-multiplexed logical channels “0” and “1”
Packet will be processed.

In this embodiment, the packet switch group configuration is set to 2
Although the case of the stage is shown, it is obvious that the present invention can be applied to a multi-stage group configuration of three or more stages.

〔The invention's effect〕

As described above, according to the present invention, a circuit switch is placed in front of a packet switch in ISDN, and when setting a virtual call between unused channels, the ports accommodating these two channels are assigned to the same group, and When setting up a virtual call between an unused channel and an unused channel, by assigning a port accommodating an unused channel to the same group as a port accommodating an unused channel, two virtual calls are set up. There is an effect that the number of stages of the frame buffer in the packet switch existing between the two ports accommodating the channels can be reduced to reduce the delay in the packet switch.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the port accommodation system of the present invention. 1, ... 8 ... Channel through which B or D channel packet passes, 9 ... Channel through which D channel signaling passes, 10 ... Circuit switch, 20 ... Packet switch, 30 ...
Switch control unit, 210, ~ 213,220, ~ 223 ... port, 23
0,231,250 …… bus, 240,241 …… frame buffer.

Claims (1)

[Claims] 1. In an integrated services digital network (ISDN), ports for processing B or D channel packets are grouped, ports in the same group are connected to each other by a first bus, and each of the plurality of said groups is connected. One bus is connected with a second bus via a first frame buffer to form a super group, and further, the second buses of the plurality of super groups are connected with each other via a second frame buffer. A packet switch having a configuration of repeating connection with the third bus and a circuit switch installed in the preceding stage of the packet switch are provided, and when setting a virtual call between two unused channels. Assign two ports accommodating these two channels to the same group, and use this when setting up a virtual call between the used and unused channels. The port accommodating method characterized in that the port accommodating the unused channel and the port accommodating the unused channel are allocated to the same group.