JPH0548653A - Packet multiplexer - Google Patents

Abstract

PURPOSE:To provide the packet multiplexer in which no congestion takes place in high speed interfaces even when fluctuation of packet flow is large and the utilizing efficiency of a private line is enhanced. CONSTITUTION:The multiplexer is provided with an ISDN line sending receiving a packet in addition to a private line, a monitor means 15 (transmission queue monitor section) monitoring whether or not a sent packet flow exceeds a prescribed length, and a transmission share means (packet transmission section 14 and a priority registration table 16) sending part of a transmission packet via the ISDN line when the flow of the packet sent by the monitor means 15 is discriminated to exceed a prescribed length.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packet multiplexer for multiplexing information from various terminal devices as a packet and transmitting the packet to a partner device.

[0002]

2. Description of the Related Art Conventionally, a device of this type performs an operation of multiplexing information sent at a low speed from a plurality of terminal devices as a packet and placing it on a high-speed dedicated line. Was supposed to use only. Therefore, in the case where the packet flow rate of the high-speed side interface is large in the conventional device as described above, if the dedicated line with the line speed suitable for the high packet flow rate is selected and installed once, the packet flow rate becomes small. However, there is a drawback in that it is uneconomical because the use efficiency of the dedicated line at that time becomes low. However, if a dedicated line with a line speed suitable for when the packet flow rate is small is selected and installed, when the packet flow rate increases, congestion occurs on the high-speed side interface (transmission packets are not sent easily and the transmission side is detained). There is a problem that it occurs).

[0003]

As described above, in the conventional packet multiplexer, the high-speed side interface is a dedicated line having a predetermined line speed. Depending on where the line speed is matched with the packet flow rate level, there have been drawbacks such as inefficient use of the leased line or congestion on the high-speed side interface.

In view of the above, the present invention eliminates the above-mentioned drawbacks. Even when the packet flow rate fluctuates greatly, congestion does not occur in the high-speed side interface, and the use efficiency of the leased line can be improved. Is intended to provide.

[0005]

According to the present invention, in a packet multiplexer for transmitting / receiving a packet via a dedicated line, an ISDN line for transmitting / receiving the packet in addition to the dedicated line,
Monitoring means for monitoring whether or not the flow rate of the packet to be transmitted exceeds a predetermined length, and when the flow rate of the packet to be transmitted is determined to exceed the predetermined length by this monitoring means, a part of the transmission packet is sent to the ISDN line. And a transmission distribution means for transmitting the data via the transmission.

[0006]

In the packet multiplexer of the present invention, the monitoring means monitors whether or not the flow rate of packets to be transmitted exceeds a predetermined length. When it is determined that the flow rate of packets transmitted by the monitoring means exceeds a predetermined length, the transmission distribution means
A part of the transmission packet is transmitted via the ISDN line.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a packet multiplexer of the present invention. Reference numerals 1 and 2 are packet multiplexers, 3 is a dedicated line for transmitting packets, 4 is a modem that constitutes the high-speed side interface of the packet multiplexers 1 and 2, and 5 is ISDN that connects the packet multiplexers 1 and 2.
A packet network (ISDN line), 6-1 to 6-n are terminal devices for transmitting / receiving various information to / from the packet multiplexer 1, and 7 is a host computer connected to the packet multiplexer 2. In this example, the high-speed interfaces of the packet multiplexers 1 and 2 are composed of the leased line 3 and the ISDN network 5.

FIG. 2 is a block diagram showing a detailed example of the packet multiplexer 1. 11 is a terminal device 6-1 to 6
The terminal control unit 12 for transmitting / receiving information to / from -n packetizes the information input from the terminal control unit 11 and multiplexes it, and the packets received by the packet receiving unit 13 to each of the terminal devices 6-1 to 6-6. Demultiplexing unit 13 for demultiplexing into the information for -n, 13 is dedicated line 3 and ISDN packet network 5
A packet receiving unit for receiving packets sent from
Reference numeral 14 designates the packet passed from the demultiplexing unit 12 to the dedicated line 3
And the ISDN packet network 5, the packet transmitting unit that distributes and transmits the packet to the ISDN packet network 5, 15 the transmission queue length monitoring unit that monitors the leased line transmission queue length proportional to the flow rate of the packet transmitted using the leased line 3, and 16 the packet that is transmitted. A priority registration table storing data for determining whether to send by the leased line 3 or the ISDN packet network 5, 17 is an input unit for registering priority data of a packet to be sent to the priority registration table 16, 18 Is a leased line interface unit in which a transmission packet waits for transmission. Reference numeral 19 is an ISDN side interface. The configuration of the packet multiplexer 2 shown in FIG. 1 is also the same.

Next, the operation of this embodiment will be described. The information transmitted from the terminal devices 6-1 to 6-n is received by the terminal control unit 11 and passed to the demultiplexing unit 12.
The demultiplexing unit 12 packet-multiplexes the input information from each terminal and passes it to the packet transmitting unit 14. The packet transmitter 14 transmits the input packet to the transmission queue length monitor 1
According to the packet flow rate obtained from 5, the transmission is controlled using only the dedicated line 3 or both the dedicated line 3 and the ISDN packet network 5. Here, the leased line interface 18 is a portion in which a packet transmitted using the leased line 3 waits for transmission, and the transmission queue length monitoring unit 15 monitors the packet transmission queue length of this portion, whereby the transmission queue length is determined. Is greater than the predetermined length, the transmission queue length monitoring unit 1
5 informs the packet transmitter 14 of this. When the packet transmission unit 14 is informed that the transmission queue length of the packet to be transmitted exceeds the predetermined length, the packet transmission unit 14 determines that the flow rate of the transmission packet has exceeded the line speed of the dedicated line 3, and the demultiplexing unit 14 A part of the packet sent from 12 (which cannot be sent by the dedicated line 3) is distributed to the ISDN packet network 5 side and transmitted.

That is, the packet transmission unit 14 refers to the priority registration table 16 and sends the information from each terminal of the terminal devices 6-1 to 6-n having a higher transmission priority to the leased line interface 18. , The lower priority one is sent to the interface 19 of the ISDN packet network 5. Therefore, a packet from a terminal with a low priority that cannot be sent through the leased line 3 is IS
It is transmitted to the packet multiplexing device 2 side via the DN packet network 5. The contents of the priority registration table 6 are pre-registered from the input unit 17 by an operator or the like, and the contents are data indicating the transmission priority order of the transmission information received from the terminal devices 6-1 to 6-n. ..

After that, when the packet transmission unit 14 is informed by the transmission queue length monitoring unit 15 that the packet transmission queue length has fallen below a predetermined level, all the packets sent from the demultiplexing unit 12 are reassigned to the dedicated line. Interface 1
The transmission operation is performed using the dedicated line 3 via the communication line 8. This transmission operation is the same in the packet multiplexer 2 as well, except that the terminal device that sends data via the low-speed interface is replaced by the host computer 7.

Next, the receiving operation of the packet multiplexer 1 will be described. The packet receiving unit 13 also receives packets sent via the leased line 3 from the ISDN packet network 5
Packets sent via the are also received, and these packets are sent to the demultiplexing unit 12 in the order of reception. The demultiplexing unit 12 separates the packet sent from the packet receiving unit 13 for each terminal device, and distributes the separated information to each terminal device 6-1 to 6-n via the terminal control unit 11.

According to this embodiment, the packet multiplexers 1 and 2 are connected via the dedicated line 3 and the ISDN packet network 5, and the flow rate of the transmission packet is increased. If the line speed of the leased line 3 is exceeded, a part of the packet is transferred to the ISDN packet network 5
The bucket can be transmitted using both the leased line 3 and the ISDN packet network 5. Therefore, the line speed of the dedicated line 3 can be adjusted to a standard packet flow rate to improve the usage efficiency of the dedicated line 3 and cannot be sent when the packet flow rate becomes large. Minutes ISDN packet network 5
Since it can be transmitted via the network, it is possible to prevent congestion on the high-speed side interface. Since the ISDN packet network 5 is charged in proportion to the amount of packets sent using the ISDN packet network 5, it is not uneconomical even if it is not normally used.

[0014]

As described above, according to the packet multiplexing apparatus of the present invention, even when the packet flow rate fluctuates greatly, congestion does not occur in the high speed side interface, and the usage efficiency of the leased line can be improved. ..

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a packet multiplexer of the present invention.

FIG. 2 is a block diagram showing a detailed example of the packet multiplexer shown in FIG.

[Explanation of symbols]

1, 2 ... Packet multiplexing device 3 ... Leased line 4 ... Modem 5 ... ISDN packet network 6-1 to 6-n ... Terminal device 7 ... Host computer 11 ... Terminal control unit 12 ... Demultiplexing unit 13 ... Packet receiving unit 14 ... packet transmission unit 15 ... packet transmission queue length monitoring unit 16 ... priority registration table 17 ... input unit 18 ... leased line interface 19 ... ISDN side interface

Claims (1)

[Claims] 1. A packet multiplexer for transmitting / receiving a packet via a leased line, and monitoring an ISDN line for transmitting / receiving the packet in addition to the leased line and whether or not the flow rate of the transmitted packet exceeds a predetermined length. And the monitoring means, and when it is determined that the flow rate of the packet to be transmitted exceeds the predetermined length, a part of the transmission packet is transmitted to the ISDN.
A packet multiplexing apparatus comprising: a transmission distribution unit that transmits data via a line.