JP3111520B2 - Alarm notification method for data transmission equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alarm notification system for a data transmission apparatus for transmitting data using a switching network in which a number of slave stations are connected to a master station.

[0002]

2. Description of the Related Art Hitherto, in a data transmission apparatus having a multipoint configuration, when a multipoint connection is made using a dedicated line, a large number of slave stations sequentially perform alarm notification by polling from a master station. . In this case, the alarm notification is performed by a band division or multiplexed channel called a diagnosis channel for the data channel. On the other hand, as a simple system, when a large number of slave stations are connected via an exchange using a switching network, when a master station is occupied by a specific slave station, alarm notifications from other slave stations to the master station are sent in order. I was waiting.

[0003]

In the above-mentioned alarm notification system of the data transmission apparatus in the latter case, the alarm notification from a large number of slave stations to the master station needs to wait in order, so that the alarm efficiency and the real-time property are impaired. There was a problem that was.

[0004]

SUMMARY OF THE INVENTION The present invention relates to an alarm notification system for a data transmission apparatus in which a slave station notifies a master station via a switching network to which a number of slave stations are connected, wherein the master station is a first slave station. The third slave station switches the alarm notification destination from the master station to the second slave station to perform the alarm notification when the alarm notification is received from the third slave station, and the second slave station that receives the alarm notification from the third slave station performs the alarm notification. When the connection is made, the alarm notification of the own station and the alarm notification of the third slave station are performed together.

[0005]

According to the present invention, when the master station is in alarm communication with the first slave station, the third slave station switches the alarm notification destination to notify the second slave station of the alarm, and the second slave station performs the alarm notification. The notification of the alarm of the own station and the notification of the alarm of the third slave station are made to the station together.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIGS. 1A to 1C are system configuration diagrams showing an embodiment of an alarm notification method of a data transmission device according to the present invention. 1A to 1C, a data transmission apparatus (master station) 1 is connected via a telephone network 5 to a data transmission apparatus (slave station a) 2, a data transmission apparatus (slave station b) 3, and a data transmission apparatus (slave station c). ) 4. 6 indicates busy.

Next, the operation when an alarm occurs simultaneously in the slave stations a2, b3 and c4 will be described.
This will be described with reference to the communication sequence diagram shown in FIG. Slave station a
2. The slave station b3 and the slave station c4 each make a line connection request 21 in order to set a state in which data transmission with the master station 1 is possible. As a result, the master station 1 returns a response (data link establishment) 22 to the slave station a2, and returns a busy (data link not established) 23 to the slave station b3 and the slave station c4. The slave station a2, which has established the data link with the master station 1, then performs data transfer 24 of the signal S1 (ALMa) as information transfer, performs consolidation 5 after the data transfer is completed, and then performs disconnection 26 (FIG. 1 (a)). ).

During this sequence, the slave station b3 which has been returned to the busy state waits for a line connection request from the slave station c4.
The slave station c4 issues a line connection request 27 to the slave station b3.
Thereby, the slave station b3 returns a response (data link establishment) 28 to the slave station c4. The slave station c4, which has established data with the slave station b3, then performs data transfer 29 of the signal S2 (ALMc) as information transfer, and performs termination 30 and then disconnection 31 after the data transfer is completed (FIG. 1 (b)).

Next, the slave station b3 issues a line connection request 32 to the master station 1, and the master station 1 returns a response (data link establishment) 33 to the slave station b3. The slave station b3 that has established a link with the master station 1 then transmits a signal S3 (ALMb, A
LMc) is subjected to data transfer 34 and 35, and termination 36 and disconnection 37 are performed after the data transfer is completed (FIG. 1C).

In this case, the line connection time is 20 s, the signal 1
Assuming that the data transmission time per unit is 5 s, the disconnection time when busy is 50 s, and the termination and line disconnection times are 10 s, the alarm notification time to the master station 1 is 35 s (20 s + 5 s +) from the slave station a 2. 10s), Alarm notification time from slave station b3 is 125s (50s + 20s + 5s + 10s + 20s + 5s + 5s + 10s)
, And the alarm notification time is 125 s as a whole.

On the other hand, when the alarm notification to the master station 1 in the conventional method is performed from the slave stations a2, b3 and c4, the alarm notification time from the slave station a2 is 35 seconds (20s + 5s). + 10s), the notification time from the slave station b3 is 85s (50s + 20s + 5s + 10s), and the notification time from the slave station c4 is 135s (50s + 50s + 20s + 5s + 10s).

That is, the data link for the alarm notification of the main station 1 of the present invention can be established two times as compared with the conventional method of three times, which is more efficient. Since the time is 125 s as compared with 135 s, the real-time property can be further improved.

[0013]

As described above, according to the present invention, when the master station has received an alarm notification from the first slave station, the third slave station switches the alarm notification destination to the second slave station and the second slave station. Is configured to notify the master station of the alarm notification of its own station and the alarm notification of the third slave station together, so that the efficiency and real-time performance of the alarm notification from the slave station to the master station can be improved.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram showing an embodiment of an alarm notification method of a data transmission device according to the present invention.

FIG. 2 is a communication sequence diagram of the system configuration diagram shown in FIG.

[Explanation of symbols]

 Reference Signs List 1 data transmission device (master station) 2 data transmission device (slave station a) 3 data transmission device (slave station b) 4 data transmission device (slave station c) 5 telephone network

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H04L 12/24 H04L 12/26 G06F 13/00 351 G06F 13/00 353

Claims (1)

(57) [Claims] 1. An alarm notification system for a data transmission apparatus in which a slave station issues an alarm to a master station via a switching network to which a number of slave stations are connected, wherein the master station receives an alarm notification from a first slave station. The third slave station switches the alarm notification destination from the master station to the second slave station to perform the alarm notification, and the second slave station, which has received the alarm notification from the third slave station, performs its own alarm when connected to the master station. An alarm notification method for a data transmission device, wherein notification is performed together with an alarm notification of a third slave station.