JPH0286246A - Link state information controller - Google Patents

Abstract

PURPOSE:To facilitate the maintenance of a link by providing an SIOS transmission cause identification means to identify the presence of a link fault. CONSTITUTION:A level I section 2 is connected to a level II section 3 and a level III section 4 is connected to a host and the level II section 3 is provided with a transmission processing section 31, a reception processing section 32, a link fault detection circuit 33 and an SIOS cause identification section 34. Then an SIOS transmission cause is added at the SIOS signal transmission and the SIOS cause identification section 34 analyzes the cause at the SIOS signal reception and outputs an alarm via an alarm output line 5. Thus, it is possible to control the link state information by identifying the transmission cause of the SIOS signal in such a manner.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a link state information control device, and in particular, to a link state information control device.
Link status information fee 1a that allows link status information to be controlled by identifying transmission factors of IO3 signals
Regarding the II device.

[Prior Art] Generally, two nodes are connected by a line, and the data transmission protocol between the nodes is CCITT No. 2.

In a transmitting/receiving device that communicates in accordance with the No. 7 signal system, the SIOS signal is used to notify that the transmitting/receiving process is stopped in its own notebook. And this CCIT
T No. 7 The SIOS signal, which is a major feature of the signaling system, is transmitted either when instructed by the upper layer in response to instructions from the maintenance personnel, or when it is transmitted autonomously when a link failure is detected in the level ■ section. There are two ways.

However, in the conventional link state information control device, 5iO
It was impossible for the node that received the S signal to identify it. For this reason, it was not possible to determine whether the ringdown was simply due to the other node's convenience or whether the ringdown was due to a link failure.

[Problems to be Solved] Even if the conventional link status information control device described above receives a SIOS signal, does it indicate whether it is a link failure that should be outputted as an alarm and notified to the maintenance personnel, or is it simply due to the convenience of the other node? First, there was a problem in that it was not possible to determine whether there was a need to notify the maintenance personnel.

The present invention has been made in view of the above problems, and s
An object of the present invention is to provide a link state information control device capable of controlling link state information by identifying transmission factors of ROS signals.

[Means for Solving the Problems] In order to achieve the above object, the link state information control device of the present invention includes a transmitter having an S■○S transmission factor adding means for adding a SIOS transmission factor when transmitting a SIOS signal, and a 5I
and a receiving section having SIOS transmission factor identification means for identifying the Sr○S transmission factor added by the 5lO5 transmission factor addition means when receiving the O9 signal.

In other words, among the signal fields, the fields processed in the level ■ part are used, and the
By adding the 5IQs transmission factor to the field that is the care part, the other party's notebook can identify whether there is a link failure or not.

[Example] Hereinafter, the present invention will be explained in detail based on the drawings.

FIG. 1 is a block diagram of a link state information control device according to an embodiment of the present invention, and FIG. 2 is a diagram showing a signal format in the link state information control device of FIG.

In FIG. 1, 1 is a line connecting two notes, and is connected to level 1 section 2.

In addition, this level 1 part 2 is connected to level ■ part 3,
Furthermore, a level ■ section 4 is connected above it.

On the other hand, within the level ■ section 3, a transmission processing section 31, a reception processing section 32, a link abnormality detection circuit 33, and a 5IO3 factor identification section 34 are provided.

Here, the 5IO3 signal is sent out by the transmission instruction from the level ■ section 4 or by the Sr○ signal from the link abnormality detection circuit 34.
This is either an S transmission instruction, and a SIOS signal is sent to line 1 via level 1 section 2.

Also, when the 5IO9 signal is received, it is manually input to the reception processing unit 32 from the line 1 via the level 1 unit 2, and the SIO
After analyzing the cause by the S factor identification unit 34, an alarm is outputted via the alarm output line 5.

Furthermore, in the signal format shown in Fig. 2, Don
The 2 bits that are the ``tcare'' part are coded; ``00''B indicates the convenience of the other party's notebook, and ``l1''B indicates a link error.

Next, FIG. 3 is a flowchart illustrating the link layer I111311 method in the link state information control device of FIG. 1.

As shown in FIG. 3, on the transmission side, the transmission processing section 31 has five
When receiving an IoS transmission instruction, it is determined whether the instruction is from the link abnormality detection circuit 33. If the link is abnormal according to the instruction from the link abnormality detection circuit 33,
11'' code and send it.

On the other hand, if this is not the case, it is assumed that this is an instruction from an upper layer, and a "°00'' code is set and sent.

On the other hand, on the receiving side, when the reception processing unit 32 receives the 5IQs signal, it determines whether the reception code is "0011" or "11"° using the SIOSIO5 factor identification 4.

If the received code is I+ 1111 and is discontinued, an alarm is output via the alarm output line 5 and the maintenance person is notified.

However, if it is determined to be ``00'', then
There is no need to notify the maintainer since it is for the convenience of the other node. Therefore, no alarm is output.

In this way, in this embodiment, 2 bits of information are added and S
Since the cause of the IOS signal transmission can be identified, it is possible to determine whether it is simply due to the circumstances of the other node or a link failure.

It should be noted that the present invention is not limited to the above embodiments, but includes various modifications within the scope of the gist. For example, in the above embodiment, to indicate the SIOS transmission factor, "
Although 00''B and '11''B are used, it is also possible to create a signal configuration in which other information is added.

[Effect of the invention] By making it possible to identify nothing, SIO can be
When issuing an S transmission instruction, there is no need to contact the other party's notebook each time, and there is an effect that a link status information control device that can facilitate link maintenance can be provided.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a link state information control device according to an embodiment of the present invention, FIG. 2 is a diagram showing a signal format in the link state information control device of FIG. 1, and FIG.
3 is a flowchart illustrating a link layer control method in the link state information control device shown in the figure. 31: Transmission processing section 32: Reception processing section 33: Link abnormality detection circuit 34: 5IO3 factor identification section

Claims (1)

[Claims] The CCITT-No. SIOS with 7 signal system
In the link state information control device that transmits and receives signals, the transmitting section has a SIOS transmission factor adding means for adding a SIOS transmission factor when transmitting a SIOS signal, and the receiving section adds the SIOS transmission factor when receiving a SIOS signal. A link state information control device comprising SIOS transmission factor identification means for identifying a SIOS transmission factor added by an adding means.