Transmission device serially resetting each circuit included therein

Abstract

A transmission apparatus includes: a plurality of signal transmission circuits on a transmission path; a monitoring unit that detects a fault by monitoring an operating status of each of the signal transmission circuits; a controlling unit that outputs a reset instruction when the monitoring unit detects the fault; and an individual resetting unit that receives the reset instruction and resets individually each of the signal transmission circuits.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a block diagram of a transmission device and a controlling and monitoring unit according to a first embodiment of the present invention;

FIG. 2 is a block diagram of a transmission apparatus according to the first embodiment;

FIG. 3A is a flowchart of a recovering process performed by the transmission apparatus;

FIG. 3B is a flowchart of a resetting process performed by the transmission apparatus;

FIG. 4 is a block diagram of a transmission apparatus according to a second embodiment of the present invention;

FIG. 5 is a flowchart of a resetting process performed by the transmission apparatus;

FIG. 6 is an explanatory view of a transmission system deploying the transmission apparatus according to the present invention;

FIG. 7 is a block diagram of a conventional transmission device and a conventional controlling and monitoring unit; and

FIG. 8 is a block diagram of a conventional transmission apparatus.

Claims

1. A transmission apparatus comprising: a plurality of signal transmission circuits on a transmission path;a monitoring unit that detects a fault by monitoring an operating status of each of the signal transmission circuits;a controlling unit that outputs a reset instruction when the monitoring unit detects the fault; andan individual resetting unit that receives the reset instruction and resets individually each of the signal transmission circuits.

2. The transmission apparatus according to claim 1, wherein the signal transmission circuits includes at least a first signal transmission circuit and a second signal transmission circuit that is located downstream of the first signal transmission circuit on the transmission path, andthe individual resetting unit resets the second signal transmission circuit after resetting the first signal transmission circuit.

3. The transmission apparatus according to claim 1, wherein the monitoring unit determines whether the fault is detected every time the individual resetting unit resets each of the signal transmission circuits.

4. The transmission apparatus according to claim 3, further comprising a testing unit that tests each of the signal transmission circuits by passing a test signal through the signal transmission circuits, wherein the monitoring unit locates a point of the fault based on a test performed by the testing unit.

5. The transmission apparatus according to claim 4, wherein the testing unit includes: a creating unit that creates the test signal having the same waveform as that of the signal;a detecting unit that detects a operation of each of the signal transmission circuits input with the test signal; anda judging unit that judges whether each of the signal transmission circuits operates normally with the test signal, based on the operation detected by the detecting unit.

6. The transmission apparatus according to claim 1, wherein the transmission apparatus includes a first set of the signal transmission devices on a first line used as an active line; anda second set of a plurality of signal transmission devices on a second line, andthe monitoring unit sets the second line as the active line when the transmission apparatus does not become operable after a resetting performed by the individual resetting unit.

7. The transmission apparatus according to claim 1, wherein the monitoring unit and the controlling unit are controlled by a remote controlling unit that is connected thereto over a network.

8. A fault-recovery method for a transmission apparatus including a plurality of signal transmission circuits and a resetting unit connected to the signal transmission circuits, comprising: monitoring an operating status of each of the signal transmission circuits;detecting a fault based on a result of the monitoring;outputting a reset instruction to the reset unit when the fault is detected at the detecting; andresetting individually each of the signal transmission circuits by the reset circuit.