JPS6277733A - Packet length converting system - Google Patents

Abstract

PURPOSE:To improve the transmission efficiency by changing the packet length automatically depending on a subscriber line and the transmission line quality of a relay line in a packet exchange thereby reducing the retransmission of a packet. CONSTITUTION:When a packet exchange 30 communicates with a subscriber terminal device 10 and a packet exchange 31 via a subscriber line 20 and a relay line 4, line controllers 50-5n count the retransmission packet request number of times from the terminal device 10 and the exchange 31 and when the count number exceeds a prescribed value, it is discriminated that the transmission quality of the lines 20, 4 is deteriorated and a change signal of packet length is sent to a central controller 7 via an input data bus 60. Then the device 7 sets the packet size registration area of the area managing the devices 50-5n into the packet length size in matching with the transmission quality, the result is informed to the terminal device 10 and the exchange 31 via the devices 50-5n and the succeeding communication uses the changed packet length.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a packet length conversion method, and in particular to a packet length conversion method for a packet switch that can be applied to a packet switching network with poor transmission path quality. Regarding the conversion method.

[Conventional technology]

Conventionally, packet switching equipment stores 1 in advance as system data.
It was configured to set a fixed packet data size.

[Problems to be solved by the invention] The conventional packet switching equipment described above has a fixed packet length (data length), so if a line with poor transmission quality is used, some packets (data) may The drawback is that a high bit error rate occurs, packets (data) are frequently retransmitted, and transmission efficiency decreases.

[Means for solving problems]

The present invention allows a packet switching equipment that accommodates subscriber terminals to send retransmitted packets (data) to connected subscriber terminals and switching equipment based on the transmission path quality of subscriber lines and trunk lines.
By counting the number of requests and automatically changing the packet length (data length) and sending it out when the number of requests exceeds a certain value, the above disadvantages are solved, reducing the number of retransmissions of packets (data) and improving transmission efficiency. This enabled high-speed communication.

〔Example〕

Next, one embodiment of the present invention will be described using the drawings.

Figure 1 is a schematic diagram showing an embodiment of the packet length conversion method of the present invention. The packet switch 30 is the subscriber line 20
When communicating with the subscriber terminal 10 and the packet switch 31 via the relay line 4, the line control device 50.
5n is the subscriber line 20 due to the addition of the subscriber terminal 10.
It determines that the transmission path quality of the relay line 4 is poor, and transmits a packet length (data length) change signal to the central control unit i#7 via the input data bus 60. When the central controller 7 receives the packet length (data length) change signal, the central controller 7 changes the line controller 5 to
0 # Set the packet (data) size registration area of the area managing 5n to a packet length (data length) size commensurate with the transmission path quality, and set the line control device 50 and 5n to the subscriber terminal 10 and packet switch 31. Notify the changed packet length (data length) for subsequent communication via
This makes it possible to increase transmission efficiency.

〔Effect of the invention〕

As explained above, the present invention enables packet switching equipment that accommodates subscriber terminals to retransmit packets (data) by automatically changing the packet length (data length) depending on the transmission path quality of subscriber lines and trunk lines. This has the effect of increasing transmission efficiency.

[Brief explanation of drawings]

FIG. 1 is a block diagram of one embodiment of the present invention. 10~1n...Subscriber terminal, 20~2n...
...Subscriber line ill, 30.31...Packet switch, 4...Relay line, 50-5n...
... Line control device, 60 ... Input data path, 61 ... Output data bus, 7 ... Central control device, 8 ... Memory.

Claims (1)

[Claims] By counting the number of retransmission packet requests based on the transmission quality of the subscriber line and trunk line, and automatically changing the packet length and sending it out when it exceeds a certain value, the subscriber line and trunk line match the quality of the transmission line. A packet length conversion method that reduces packet retransmission and increases transmission efficiency.