JPH0366243A - Bus broadcast type packet switchboard - Google Patents

Abstract

PURPOSE:To attain packet multiple address communication to plural optional destinations by using a multiple address communication identifying number provided to an internal transfer bus packet to control the destination of a packet for multiple address communication on an internal transfer bus. CONSTITUTION:An incoming subscribed line packet 317 being a multiple address communication packet sent from an incoming subscriber line terminal equipment 301 is converted into an internal transfer packet 318 by a packet transmitter 310 and sent onto an internal transfer bus 313. A destination packet receiver address 103 goes to logical '0' and a multiple address communication identification number 104 goes to '100'. When the multiple address communication identifying number of the internal transfer bus packet 318 is coincident with one of the multiple address communication identification numbers set in advance in an address filter in packet receivers 314-316, the number is converted into an outgoing virtual circuit number corresponding to the multiple address communication identifying number of the internal transfer bus packet and transferred to a subscriber line packet constitution circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a bus broadcasting type packet switch that transfers data of the same content from one terminal to any one or more terminals by packet broadcast communication. .

BACKGROUND ART FIG. 4 shows the configuration of a conventional bus broadcasting type packet switch. The outgoing subscriber line terminals 5 to 9 are connected to one end of the outgoing subscriber line 32-0, and the incoming subscriber line terminals are connected to the other end of the incoming subscriber line 32-■. Packet transmitting devices 12 to 14 transmit incoming subscriber line packets 10 sent by devices 1 to 4 to internal transfer bus 11 as internal transfer bus packets 15;
and transmits the internal transfer bus packet 15 connected to the other end of the outgoing subscriber line 32-O and on the internal transfer bus 11 to the outgoing subscriber line terminal devices 5 to 9 as an outgoing subscriber line packet 16. It has packet receiving devices 17 to 19.

FIG. 5 shows the format of bucket 1 in a packet broadcast communication device using the above-mentioned bus broadcast type packet switch, and FIGS. 5(a) and 5(b) show the format.

(C) is the packet format of the internal transfer bus packet 15 on the incoming subscriber line packet 10° internal transfer bus and the outgoing subscriber line packet 16, respectively.

In FIGS. 5(a), (b), and (c), 21 is data to be transferred by a packet, 22 is a delimiter flag (F) indicating the beginning and end of the packet, and 23 is for controlling errors in the header section. Header check sequence (HC8)
, 24 and 25 are virtual circuit numbers (VCl) at the ingress subscriber line 32-■ and the egress subscriber line 32-O, respectively, and 26 indicates which bucket receiving device the internal transfer bus packet is addressed to. This is the destination packet receiving device address (A).

FIG. 6 shows the packet receiving bags Tm [17 to 19] used in the conventional bus broadcast type packet switch, and each of the packet receiving devices 17 to 19 is connected to the input signal line 27 connected to the internal transfer bus 11. , a bus concentrator 28 that is used when there are multiple internal transfer buses 1, an address filter 29 that selects only packets addressed to itself from among the packets on the internal transfer bus 11, and a a subscriber line packet configuration circuit 30 that converts the format of the outgoing subscriber line packet 16;
Subscriber line circuit 3 that sends packets to subscriber line terminal equipment
1, and an outgoing subscriber line 32-O connected to an outgoing subscriber line terminal device.

Next, first, the switching operation in the case of one-to-one communication of the conventional bus broadcast type packet switching equipment will be explained using FIGS. 4 to 6.

In FIG. 4, the incoming subscriber line packet 10 transmitted from the incoming subscriber line terminal device 1 to the outgoing subscriber line terminal device 7 is input to the packet transmitting device 12, and when it is input to the packet transmitting device 12, )
The packet is converted into an internal transfer bus packet 15 having the packet format shown in FIG.

Here, for example, the destination packet receiving device address 26 in FIG. 5(b) is the number "2" of the packet receiving device to which the destination outgoing subscriber line terminal device 7 is connected, and The side subscriber line virtual suite number 25 is '201J.

The internal transfer bus packet 15 is transferred to all the packet receiving devices 17 to 19 connected to the internal transfer bus 11, but due to the function of the address filter 29 shown in FIG. The internal transfer bus packet 15 is received.

In the packet receiving device 18, the subscriber line packet configuration circuit 30 converts the internal transfer bus packet 15 into the form shown in FIG.
It is converted into the format of the outgoing subscriber line packet 16 shown in c) and output to the outgoing subscriber line terminal device 7. In this way, in a bus broadcast packet switch, one-to-one communication is possible.
Packet exchange is performed in the case of communication.

Next, the switching operation of the packet broadcast communication in the conventional packet switching equipment will be explained using FIG.

From the incoming subscriber line terminal device 1 to the outgoing subscriber line terminal device 7,
The incoming subscriber line packet 10 as a broadcast communication packet sent to 8.9 is sent by the packet transmitting device 12 to
The data are converted into internal transfer bus packets 34, 35 and 36 and sent onto the internal transfer bus 11. Here, since there are three outgoing subscriber line terminal devices to which the incoming subscriber line packet 10 as a broadcast communication packet is sent, the internal transfer bus packets sent by the packet transmitter 12 are three packets 34 to 34. 36, and this internal transfer bus packet 34-3
The destination packet receiving device addresses 26 of No. 6 are "2J, r3" and "3J," respectively. Also, the outgoing subscriber line virtual circuit numbers 25 are "2J, r3" and "3J," respectively.
l '301J.

It becomes "302".

Internal transfer bus packet 34 is transmitted by packet receiving device 18 and internal transfer bus packet l-35.

36 is received by the packet receiving device 19, and within each packet receiving device, the same processing as in the case of one-to-one communication is performed, and the subscriber line packet is sent to the output side output 11 person line terminal device 7° 8.9. 37, 38, and 39 are sent out.

In this way, even the conventional packet communication device can perform packet broadcast communication to any number of destinations.

Problems to be Solved by the Invention However, in the conventional bus broadcasting type packet switching equipment described above, when performing packet broadcast communication, the packet transmitting device is connected to the number of destination subscriber line terminal devices for one transmitted packet. Therefore, there is a problem in that the processing time required for the packet transmitting device to transmit the internal transfer bus packets increases in proportion to the number of outgoing subscriber line terminal devices at the other end. Ta.

In addition, the traffic on the internal transfer bus increases in proportion to the number of outgoing subscriber line terminals at the other end, so if the number of outgoing subscriber line terminals at the other end of broadcast communication is large, or if the number of outgoing subscriber line terminals at the other end is When a large number of broadcast communications are handled at the same time, there is a problem in that packets may be piled up on the internal transfer bus, which may significantly reduce the throughput of the exchange.

The present invention solves these conventional problems,
Provides an excellent bus broadcast type packet device that does not cause packet congestion on the internal transfer bus even when there are many outgoing subscriber line terminal devices at the other end or when a large number of broadcast communications are exchanged at the same time. It is intended to.

Means for Solving the Problems In order to achieve the above object, the present invention includes, in the header portion of an internal transfer bus packet, an identification information field indicating whether or not the packet is for broadcast communication, and if the packet is for broadcast communication. one or more packet transmitting devices that transmit a packet with a broadcast communication identification number part indicating which broadcast communication is related to the broadcast communication; and one or more packet transmitting devices that are connected to the packet transmitter in a bus-like manner by one or more internal transmission paths. a conversion table for converting a broadcast communication identification number of a received internal transfer bus packet into an outgoing subscriber side virtual circuit number;
and a subscriber line packet configuration circuit that converts the internal transfer bus packet into an output subscriber line packet and outputs the converted internal transfer bus packet.
and one or more packet receiving devices.

Therefore, according to the present invention, by managing the destination of broadcast communication packets on the internal transfer bus using the broadcast communication identification number assigned to the internal transfer bus packet, the incoming subscriber line terminal Even in the case where there are multiple outgoing subscriber line terminal devices connected to one or more packet receiving devices that are the destinations of packets sent by the device, the packet transmitting device sends out the incoming subscriber line packets. The internal transfer bus packet is only one packet, so congestion on the internal transfer bus does not occur even when there are many outgoing subscriber line terminal devices at the other end or when a large number of broadcast communications are exchanged at the same time. This has the effect that there is nothing to do.

Embodiment FIG. 1 shows the packet format of an internal transfer bus packet in an embodiment of the bus broadcasting type packet switch according to the present invention. In FIG. The delimiter flag (F) indicating the start and end, 103, is the destination packet receiving device address (A), and if the internal transfer bus packet is for broadcast communication, it is used to identify that it is a packet for broadcast communication. Set it to a special number (for example, ○). 104 is the virtual circuit number VCI of the outgoing subscriber line packet
(0), and when the internal transfer bus packet is for broadcast communication, the broadcast identification number (BID) is used instead of the virtual circuit number (VCI). 105 is a header check sequence (10
5).

FIG. 2 shows the configuration of a packet receiving device used in the bus broadcast type bucket exchanger in the above embodiment, in which 201 is an input signal line connected to an internal transfer bus, 202 is an input signal line connected to a plurality of internal transfer buses. 203 is an address filter that selects and receives packets on the internal transfer bus; 204 is an address filter that selects and receives packets on the internal transfer bus; 204 uses the broadcast communication identification number BID of the received internal transfer bus packet as the outgoing subscriber side virtual circuit number VCI (0); 205 is a subscriber line packet configuration circuit that converts the received internal transfer bus packet into the format of an outgoing subscriber line packet, and 206 is a subscriber line that sends the packet to the outgoing subscriber line terminal device. Circuit 207-0 is the outgoing subscriber line connected to the outgoing subscriber line terminal equipment.

FIG. 3 is a block diagram showing the bus broadcast type packet switch in the above embodiment. In Figure 3, 301~
304 is an incoming subscriber line terminal device connected to one end of the incoming subscriber line 207-I of the exchange, and 305 to 309 are outgoing subscriber line terminals connected to one end of the outgoing subscriber line 207-0 of the exchange. Line terminal equipment, 310 to 312 are incoming subscriber lines 207
- connected to the other end of I, the incoming subscriber line terminal device 301;
- 304 send out incoming subscriber line packets onto the internal transfer bus 313 as internal transfer bus packets; 314 to 316 refer to the outgoing subscriber line 20;
7-0 and transmits the internal transfer bus packets on the internal transfer bus 313 to the outgoing subscriber line terminal devices 305 to 30.
9 is a packet receiving device that sends out an outgoing subscriber line packet, 317 is an incoming subscriber line packet that is sent out from the incoming subscriber line terminal device 301, and 318 is an internal transfer corresponding to the incoming subscriber line packet 317. bus packet, 319.
320 and 321 are respective outgoing subscriber line terminal devices 307
, 308.309.

Next, the operation of the above embodiment will be explained. When the destination of the incoming subscriber line packets sent by the incoming subscriber line terminal device is each addressed to one outgoing subscriber line terminal device, the packet transmitting devices 310 to 312 are configured as shown in FIG. Sends internal transfer bus packets in packet format.

In each of the packet receiving devices 314 to 316, the address filter 20 shown in FIG.
3 receives only the internal transfer bus packet addressed to its own packet receiving device, converts it into an outgoing subscriber line packet by the subscriber line packet configuration circuit 205, and sends it to the outgoing subscriber line 207 via the subscriber line circuit 206. Send.

Next, the exchange operation of packet broadcast communication will be explained using FIG. In FIG. 3, the incoming subscriber line terminal device 3
The incoming subscriber line packet 317, which is a broadcast communication packet transmitted from 01, is transmitted by the packet transmitting device 310 to
It is converted into one internal transfer bus packet 318 and sent onto the internal transfer bus 313.

Here, the packet format of the internal transfer bus packet 318 is shown in FIG. Communication identification number 10
4 becomes rloOJ.

In each packet receiving device 314 to 316, the address filter 203 reads the destination packet receiving device address 103 of the internal transfer bus packet 318 transferred on the internal transfer bus, and if the content is "O", Further, when the broadcast communication identification number 104 of the internal transfer bus packet 318 is read and the number matches one of the broadcast communication identification numbers preset in the address filter 203, the internal transfer bus packet 318 is converted to the conversion table. 204.

The conversion table 204 converts the broadcast communication identification number of the internal transfer bus packet into a corresponding output virtual circuit number, and transfers it to the subscriber line packet configuration circuit 205.

At this time, if there are multiple outgoing virtual circuit numbers set in the conversion table 204 for one broadcast communication identification number, the conversion table 204 copies the internal transfer bus packet 318 and outputs it. The internal transfer bus packets of the same number as the side virtual server kit number are transferred to the subscriber line packet configuration circuit 205.

Subscriber line packet configuration circuit 205 internally transfers packet 3
18 into the format of the outgoing subscriber line packet,
Outgoing subscriber line terminals 307 through subscriber line circuit 206
Outgoing subscriber line packet 319, 320.321 to 309
Send out.

In the above embodiment, the broadcast communication identification number to be received is set in the address filter 203 in each packet receiving device, and the correspondence between the broadcast communication identification number and the outgoing virtual circuit number is set in the conversion table 204. It is assumed that the relationship is set during the call setup procedure when each broadcast communication is started.

According to the embodiment described above, the destination of the internal transfer bus packet 318 is managed using the broadcast communication identification number, and the broadcast communication identification number is further converted into the outgoing subscriber line virtual circuit number within the packet receiving device. By doing so, packet broadcast communication can be performed to a plurality of outgoing subscriber line terminal devices.

Effects of the Invention As described above, according to the present invention, packet broadcast communication to a plurality of outgoing subscriber line terminal devices connected to one or more packet receiving devices can be performed by reducing the number of packets on the internal transfer bus. I configured it to do this without increasing it, so
Even if the number of destinations for broadcast communication increases, packet congestion on the internal transfer bus does not occur, and the throughput of the exchange does not deteriorate.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the format of an internal transfer bus packet of a bus broadcast type packet switch in an embodiment of the present invention, and FIG. 2 is a configuration of a packet receiving device of a bus broadcast type packet switch in an embodiment of the present invention. FIG. 3 is a block diagram showing a case where packet broadcast communication is performed in a bus broadcast type packet switch according to an embodiment of the present invention, and FIG. A block diagram showing a case in which communications are exchanged, FIG. 5 is an explanatory diagram showing a packet format used in the conventional bus broadcasting type packet switching device, and FIG. 6 is a diagram showing packet reception in the conventional bus broadcasting type packet switching device. FIG. 7 is a block diagram showing the configuration of the device. FIG. 7 is a block diagram showing a case where packet broadcast communication is performed in a conventional packet switch. 301-304... Incoming subscriber line terminal device, 305-
309... Outgoing subscriber line terminal device, 310-312.
... Packet transmission device, 313 ... Internal transfer bus, 3
14-316... Packet receiving device, 317... Incoming subscriber line packet, 318... Internal transfer bus packet, 319-321... Outgoing subscriber line packet.

Claims (1)

[Scope of Claims] An incoming subscriber line terminal device connected to an incoming subscriber line, and a broadcast communication packet in the head portion of an incoming subscriber line packet sent by the incoming subscriber line terminal device. One or more packets to be sent as internal transfer bus packets, each having an identification information section indicating whether or not the packet is for broadcast communication, and a broadcast communication identification number section indicating which broadcast communication it relates to if it is for broadcast communication. a transmitting device, and a converter connected to the packet transmitting device in a bus-like manner by one or more internal transmission paths, and converting a broadcast communication identification number of a received internal transfer bus packet into an outgoing subscriber side virtual circuit number. one or more packet receiving devices having a table and a subscriber line packet configuration circuit that converts internal transfer bus packets received from the internal transmission path into outgoing subscriber line packets and outputs the converted subscriber line packets; and an outgoing subscriber line terminal device connected to the line and inputting the outgoing subscriber line packet.