JPS62213452A - Signal terminal equipment - Google Patents

Abstract

PURPOSE:To improve the quality of the network of the CCITT No.7 signal system by retrieving a final message signal unit number in a transmission buffer when a data link or an opposite station terminal equipment is failed. CONSTITUTION:When a unknown MSU number of an opposite terminal equipment or a fault is detected by its own signal terminal equipment in a final message signal unit (MSU) retrieval program stored in a memory 3 and executed by a microprocessor 2, the message signal unit in the transmission buffer is retrieved. When the MSU number exists in the opposite terminal equipment and it is normal, the retransmission buffer of its own signal terminal equipment is revised by the opposite reception MSU to retrieve the MSU in the transmission buffer.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a signal terminal device for a common line signaling system, and in particular to a signal terminal device for a common line signaling system.
This invention relates to a signal terminal device that controls CITT No. 7 signaling system (hereinafter referred to as "RCCS7") level 2 functions.

[Conventional technology]

Conventionally, this type of signal terminal equipment transmits the final message signal unit (MessageSignal
If the value of the unit (hereinafter referred to as rMsUJ) number is normal, the MSU in the retransmission buffer and the transmission buffer can be re-dleeped, but if the value of the MSU number is unknown or abnormal, the MSU re-dleep is not performed.

[Problem that the invention seeks to solve]

Regarding CCS 7 level 2 functionality, CC ■ TT Recommendation Q
, 703 (CCITT Recommendation
tionQ, 703). The transmission MSU is transferred from a higher-level processor having a level 3 function to a signal terminal device, and is temporarily stored in a transmission buffer.

In the signal terminal device, if there is an MSU in the transmission buffer, the MSU is taken out from the transmission buffer and sent to the other party or station, and simultaneously stored in the retransmission buffer.

The MSU in the retransmission buffer is held until a normal reception completion signal for the transmitted MSU is received from the partner station.

When a signal data link controlled by a signal terminal device or a signal terminal device of the other station fails, M and SU to be sent on the failed signal link under the control of the upper processor are sent to another signal link that performs load distribution. used to send to the other station, that is, changeover
ver) control is performed.

At this time, the final MSU number received by the partner station is received from the partner station through another signal link, and based on that number, a retransmission buffer and transmission buffer MSU retrieval request is issued to the signal terminal device of the failed signal link.

In the conventional signal terminal device described above, the final MS received by the other station
If the U number value is normal, it can be retrieved normally, but
If the value is unknown or abnormal, an emergency changeover occurs.
In the case of ``geover'', no MSUU) leave is performed, so there is a drawback that all MSUs in the retransmission buffer and transmission buffer are discarded.

[Means for solving problems]

In order to eliminate such drawbacks, the present invention provides a signal transmitting/receiving circuit connected to a signal data link, and a CCITT
So, an upper processor connection circuit connected to an upper processor having a 7 signaling level 3 function, and a CCITT
CCITT NO. 7 having a microprocessor controlling the signaling level 2 protocol, a transmit buffer and a retransmit buffer. The control program for controlling the level 2 protocol of the 7 signaling system and a memory for storing data are provided.

[Effect]

In the present invention, the message signal unit in the transmission buffer can be retrieved when the last message signal unit number received at the partner station is unknown or abnormal when there is a failure in the signal data link or the signal terminal device of the other station.

〔Example〕

An embodiment of a signal terminal device according to the present invention is shown in FIG. In FIG. 1, 1 is an upper processor connection circuit connected to an upper processor 6 having a CCITT N017 signaling level 3 function, 2 is a CCITT so, 7
(Microprocessor 3 controls the K system level 2 protocol; 3 has a transmission buffer and a retransmission buffer;
ITT No. 7 is a memory signal storing a control program and data for controlling the signaling level 2 protocol; 4 is a signal transmitting/receiving circuit connected to the signal data link 7; It is connected.

In FIG. 1 64, the microprocessor 2 includes the memory 3
The CC37 level 2 protocol is controlled by programs, data, transmit buffers, and retransmit buffers stored in the CC37 level 2 protocol.

FIG. 2 is a flowchart of the MSU retrieve program stored in the memory 3 shown in FIG. 1 and executed by the microprocessor 2.

In this flow, first, step 11 of the judgment process
In step 12, the presence and normality of the last MSU number received by the other station is checked. If there is no last MSU number received by the other station, or if the last MSU number value received by the other station is abnormal, steps 13 and 14 of the MSU re-reading process in the retransmission buffer are skipped, and in step 15, the MSUI leave processing in the transmission buffer is performed. Execute. In steps 11 and 12 of the judgment process, the other station receives the final M.
If the SU number exists and its value is normal, the retransmission buffer is updated in step 13 with the last MSU number received by the other station, and in step 14, the MSUIJ! in the retransmission buffer! - Perform leave and proceed to step 15.

〔Effect of the invention〕

As explained above, in the case of a signal data link failure or a failure of the signal terminal device of the other station, when the final MSU number received at the other station is unknown or abnormal, the MSU in the transmission buffer is
By making it possible to retrieve SU,
emergency change
CCITT No.
, 7 has the effect of improving the quality of the signaling network.

[Brief explanation of drawings]

FIG. 1 is a system diagram showing an embodiment of a signal terminal device according to the present invention, and FIG. 2 is a flowchart for explaining the operation of the device shown in FIG. DESCRIPTION OF SYMBOLS 1...Upper processor connection circuit, 2...Microprocessor, 3...Memory, 4...Signal transmission/reception circuit, 5...Microprocessor bus, 6...
- Upper processor, 7...Signal data link.

Claims (1)

[Claims] A signal transmitting/receiving circuit connected to a signal data link, and a CC
ITT NO. An upper processor connection circuit connected to an upper processor having 7 signal system level 3 functions, and a CC
ITT NO. The CCITT NO. Equipped with a control program for controlling the 7 signaling level 2 protocol and a memory for storing data, the final message signal unit number received at the other station is unknown when a signal data link failure or a failure of the other station's signal terminal equipment occurs. A signal terminal device characterized in that a message signal unit in a transmission buffer can be retrieved in the event of an abnormality.