JPH02137548A - Packet exchange - Google Patents

Abstract

PURPOSE:To improve the throughput of a packet exchange by applying exchange processing to a packet transferred by plural packet multiplexers of the packet exchange with plural packet exchanges. CONSTITUTION:Plural terminal equipments 3 and plural 1st multiplex lines 13a are accommodated in plural packet multiplexers 11 in a packet exchange and a packet is transferred between the terminal equipment 3 and the line 13a. Moreover, plural 2nd multiplex circuits 13b and inter-station lines 4 connecting inter-packet exchanger 12 are accommodated, and a packet is exchanged with the packet exchange 12 between the multiplex line 13a and the inter-station circuit 4. Plural multiplex circuits 13a accommodated in each multiplexer 11 and the multiplex circuit 13 accommodated in each packet exchange 12 are connected demultiplexedly by a demultiplex connection means 100 based on a command inputted externally.

Description

[Detailed Description of the Invention] [Summary] Regarding the improvement of a packet switch equipped with a packet multiplexing device and a packet switching device, as the packet transfer capability of the packet multiplexing device improves, the packet switching processing capability of the packet switching device is improved. a plurality of packet multiplexers, each accommodating a plurality of terminal lines and a plurality of first multiplex lines, and transferring packets between the terminal lines and the first multiplex lines; accommodating a plurality of second multiplex lines and a plurality of inter-office lines connecting between the packet switching apparatuses, and transmits Paqueso I between the second multiplex lines and the inter-office lines. a plurality of packet switching devices for switching; a plurality of first multiplexing lines accommodated in each packet multiplexing device;
The device is configured to include distributed connection means for connecting the plurality of second multiplex lines accommodated in each packet switching device in a distributed manner based on an instruction input from the outside.

[Industrial application field]

The present invention relates to an improvement in a packet switch including a packet multiplexing device and a packet switching device.

[Conventional technology]

FIG. 4 is a diagram showing an example of a conventional packet switch.

In FIG. 4, the packet switching device 1 includes a plurality of packet multiplexing devices 11, a negative set of packet switching devices 12, and a plurality of multiplexing lines connecting each packet multiplexing device 11 and the packet switching device 12. It consists of 13.

Each bucket multiplexing device 11 accommodates a plurality of terminal lines 3 each terminated by a terminal device 2, transfers packets arriving from each terminal line 3 to a multiplex line 13, and transfers packets arriving from each terminal line 3 to a multiplex line 13. packets arriving from the terminal line 3 are transferred to the terminal line 3.

In addition, the bucket switching device 12 accommodates a plurality of inter-office lines 4 provided between the packet switching devices of other packet switching devices (not shown), and connects each multiplex line 13 and inter-office line 4 to Arriving packets are exchanged to each multiplex line 13 and interoffice line 4.

If the bucket transfer capacity of each packet multiplexer 11 (for example, several tens of packets per second) is sufficiently lower than the exchange processing capacity of the packet switch 1 (for example, several hundred packets),
By connecting a plurality of packet multiplexing devices 11 to the set of bucket switching devices 12 through the multiplexing line 13, the bucket switching device 12 can be operated with high efficiency.

However, when the bucket transfer capacity of the packet multiplexing bag W11 increases to a level equal to or higher than that of the packet switching device 12, the packets transferred by the plurality of packet multiplexing devices 11 are transferred into one set of packet switching devices 12. - Correlation processing by the exchange device 12 becomes impossible.

[Problem to be solved by the invention]

As is clear from the above explanation, a conventional packet switch was constructed by connecting a plurality of packet multiplexers 11 and a set of bucket switching equipment 12 through a multiplexing line 13. Packet multiplexer 11
When the bucket I/transfer capacity of the packet switching device 12 increases to a level equal to or higher than the switching processing capacity of the packet switching device 12, the packets transferred by the plurality of packet multiplexing devices 11 can be exchanged by the plurality of bucket switching devices 12. It is impossible,
It has been impossible to improve the packet switching processing capacity of the packet switch 1.

SUMMARY OF THE INVENTION It is an object of the present invention to make it possible to improve the packet switching processing capability of a packet switch as the packet/site transfer capability of a packet multiplexing device improves.

[Means to solve the problem]

FIG. 1 is a diagram showing the principle of the present invention.

In FIG. 1, 3 is a terminal line, and 4 is an interoffice line.

11 is a packet multiplexing device.

12 is a packet switching device.

133 and 13. are the first multiplex line and the second multiplex line, respectively.

100 is a distributed connection means.

[Effect]

Each packet multiplexer 11 includes a plurality of terminal lines 3 and a plurality of first multiplex lines 13 . and transfers packets between the terminal line 3 and the first multiplex line 138.

Each packet switching device 12 has a plurality of second multiplex lines 13 . and a plurality of interoffice lines 4 connecting between the bucket switching devices 12, and a second multiplex line 13.
．． and exchange packets between the interoffice lines 4.

The distributed connection means 100 connects a plurality of first multiplexed north circuits 13° accommodated in each packet multiplexing device 11 and a plurality of second multiplexed circuits 1 accommodated in each packet switching device 12.
3. are connected in a distributed manner based on instructions input from the outside.

Therefore, packets transferred by a plurality of packet multiplexing devices can be exchanged by a plurality of packet switching devices, and the packet switching processing capacity of the packet switching device is improved.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a diagram showing a packet switch according to an embodiment of the present invention, and FIG. 3 is a diagram illustrating a packet line distribution connection device in FIG. 2. Note that the same reference numerals indicate the same objects throughout the figures.

In FIG. 2, the distributed connection means 100 in FIG.
A packet line distribution connection device 14 having a configuration as shown in FIG. 3 is provided.

In FIG. 2, the packet switch 1 includes n sets of packet multiplexing devices 11-1 to 11-n, m sets of packet switching devices 12-1 to 12-m, and - sets of packet line distribution connection devices. 14, and each packet multiplexer 11-i
(+ is 1 to n) and a plurality of first multiplex lines 132 (hereinafter simply referred to as multiplex lines 138) connecting between the packet line distribution connection device 14 and each packet switching device 12j (j is 1 a plurality of second multiplex lines 13 connecting between the packet line distribution connection device 14 and the packet line distribution connection device 14;
(hereinafter simply referred to as the multiplex line 13).

Note that there are m multiplex lines 131 connecting each packet multiplexing device 11-1 and the packet line distribution connection device 14, each of which is assigned a line number N a ij,
Also, a multiplex line 13. which connects each packet switching device 12-j and the packet line distribution connection device 14. is 0,
It is assumed that each line number is assigned a line number NbJ1. Therefore, the multiplexed line 13. and 13. The total number of each is m×0. From now on, line number N, 8. Multiplexed line 13. is referred to as a multiplex line 131j, and the multiplex line 13 is assigned a line number N b j i.
゜ is called the multiplex line 13b4=.

As described above, each packet multiplexing device 11-1 accommodates a plurality of terminal lines 3 each terminated by a terminal device 2, and transfers packets arriving from each terminal line 3 to the multiplexing line 13. and multiplexed line 13. packets arriving from the terminal line 3 are transferred to the terminal line 3.

The packet switching device 12-j also has a plurality of interoffice lines 4 provided between the bucket switching devices 12-j and between the packet switching devices of other packet switching devices (not shown).
Each multiplexed line 13. and interoffice line 4
Packets arriving from each multiplexed line 13. and exchange processing is performed on the interoffice line 4.

The packet line distributed connection device 14 includes a data transmission buffer 141, a conversion memory 142, and a conversion memory rewriting circuit 143.
and a plurality of line number converters 144.

The data transmission buffer 141 and conversion memory 142 are
Line number N a given to each multiplex line 131 connecting each packet multiplexer 11 - 1 =
The line number N assigned to each multiplexed line 13b connecting between i and each packet switching device 12-j, respectively.
It has a storage area corresponding to b j i .

In such a state, the operator of the packet switching device 11i1 must adjust the packet transfer capabilities of the packet multiplexing devices 11-1 to 11-n and the packet switching processing capabilities of the packet switching devices 12-1 to 12-m to match each other. Multiple Northern Times &'i13
．． ij and each multiplexed line 13bji is transmitted to the packet line distribution connection apparatus 14 via the packet switching apparatus 12-j.

The packet line distribution connection device 14 connects the packet switching device 12 to the multiplexed line 13 . i, and multiplex line 13
56, and is transmitted from the packet switching device 12-1, the conversion memory rewriting circuit 143 connects the multiplexed line 13. , , line number N,1
The line number N14.1 of the multiplexed line ILjt is stored in the storage area corresponding to N14.1. The multiplexed line 13 is stored in the storage area corresponding to the line number N b j i of the multiplexed line 13b, i.
The line number N3i of 38 is stored.

The line number converter 144 converts each multiplex line 13° and 1
3. The corresponding multiplex lines 138 and 13 . Line number N80. and N b j i in a time-divisional manner for each predetermined time domain. From now on, multiple northern times 1
13. The line number conversion unit 144 corresponding to the multiplexed line 13.i is called a line number conversion unit 144□. The line number converter 144 corresponding to the line number converter 144
They are called b,i.

For example, when the line number converter 144aij is activated in the time domain, the activated line number converter 144,i,
is the corresponding multiplexed line 13. i, line number N a
ij is transmitted to the conversion memory rewriting circuit 143.

The conversion memory rewriting circuit 143 receives the transmitted line number N8.
The line number Nb stored in the storage area corresponding to
j, and returns it to the line number conversion unit 144ai= which transmitted the line number N,i.

Line number conversion unit 144. i, is the corresponding multiplexed line 1
338, the packet data d□8 transmitted within the activated time domain is transferred to the storage area corresponding to the line number N1.1 returned from the conversion memory rewriting circuit 143, and is transferred to 1/2 of the time domain. Store within a time space less than or equal to

Also, the line number conversion unit 144. i, is the data transmission buffer 1 within the remaining time domain of less than 1/2 of each time domain.
The packet data dbji stored in the storage area corresponding to the line number N&1 of 41 is extracted and sent to the multiplexed line 1338 within the time domain.

Similarly, when the line number converter 144bji is activated in another time domain, the activated line number converter 144b,...
is the corresponding multiplexed line 13. , , line number N b
j i is transmitted to the conversion memory rewriting circuit 143.

The conversion memory rewriting circuit 143 receives the transmitted line number N.
The line number N ai stored in the storage area corresponding to b j i is extracted and sent back to the line number conversion unit 144 bji to which the line number N b j i was transmitted.

The line number converter 144b=i converts the corresponding multiplex line 1
3. Packet data db transmitted from ji in the activated time domain. , is stored in the storage area corresponding to the line number N a i returned from the conversion memory rewriting circuit 143 within a time domain that is less than 1/2 of the time domain.

Also, the line number conversion unit 144. , , is the data transmission buffer 1 within the remaining time domain of less than 1/2 of each time domain.
41 line number N14. The Paqueso I data daij stored in the storage area corresponding to is extracted and sent to the multiplexed lines 13b and t+ within the time domain.

As described above, from the packet multiplexer 11-1 to the multiplex line 13. Packet data d transmitted via , ,
aij is transmitted by the conversion memory rewriting circuit 143 to the packet switching bag 212-j via the multiplex line 13bJi, and the packet data transmitted from the packet switching device 12-j via the 13-bit multiplex line d
bji is converted to multiplexed line 13 .bji by conversion memory rewriting circuit 143 . i, via the bucket/node multiplexer 11-1.
This will be communicated to

That is, the packet line distribution connection device 14 connects the multiplex line 13 . It plays the role of a time division switch that connects the multiplexed lines 13b, ti connecting between the packet switching device 12-j and the packet switching device 12-j based on a command transmitted from the packet switching device 12.

Note that the connection between the multiplexed lines 13a1 and 1314 can be changed at any time according to an input connection command.

As is clear from the above description, according to this embodiment, n sets of packet multiplexing devices 11-1 to 11n and n sets of packet switching devices 12-1 to 12-m are connected to the bucket line distribution connection device 14. Since it is possible to connect freely via the network, and to change the connection as necessary, it is possible to connect the m group which has the packet switching processing capacity corresponding to the packet transfer capacity of the n group of packet multiplexers 11-1 to 11-n. packet switching devices 12-1 to 12-m are provided, and each multiplexing line 1388 and 13 is provided so that packets suitable for the packet switching processing capacity of each packet switching device 12-j are transferred.
By inputting the connection command with bjt, the package/
) A packet multiplexing device 11-1 whose transfer capability has improved beyond the packet switching processing capability of the packet switching device 12-j.
It is possible to configure a packet switch 1 including a plurality of sets.

Note that FIGS. 2 and 3 are only one embodiment of the present invention, and for example, the distributed connection means 100 is not limited to the illustrated conversion memory rewriting circuit 143, and many other modifications may be made. However, the effects of the present invention remain the same in either case.

〔Effect of the invention〕

As described above, according to the present invention, in the packet switching equipment,
Packets transferred by a plurality of packet multiplexing devices can be exchanged by a plurality of packet switching devices, and the packet switching processing capability of the packet switching device is improved.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the principle of the present invention, FIG. 2 is a diagram showing a packet switch according to an embodiment of the present invention, FIG. 3 is a diagram illustrating the packet line distribution connection device in FIG. 2, and FIG. 1 is a diagram showing an example of a conventional packet switch. In the figure, l is a packet switch, 2 is a terminal device, 3 is a terminal line, 4 is an interoffice line, 11 is a packet multiplexer,
12 is a packet switching device; 13 is a multiplex line; 13. 13 is a (second) multiplex line, 14 is a packet line distributed connection device, 100 is a distributed connection means, 141 is a data transmission buffer, 142 is a conversion memory, 143 is a conversion 144 represents a memory rewriting circuit and a line number conversion unit.

Claims (1)

[Scope of Claims] A plurality of terminal lines (3) and a plurality of first multiplex lines (13_a) are accommodated, respectively, and between the terminal lines (3) and the first multiplex lines (13_a). a plurality of packet multiplexing devices (11) that transfer packets, a plurality of second multiplexing lines (13_b), and a plurality of interoffice lines (4) that connect the packet switching devices (12); and the second multiplex line (13_a)
and interoffice lines (4); a plurality of packet switching devices (12) that exchange packets between each other; and a plurality of first multiplexing lines (13_a) accommodated in each of the packet multiplexing devices (11); a plurality of second multiplex lines (1) accommodated in each packet switching device (12);
3_b), and a distributed connection means (100) configured to perform distributed connection between 3_b) and 3_b) based on an instruction inputted from the outside.