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Line switching control system in synchronous communication network system
| Details |
Inventors: Ikawa, Fumihiro;
Assignee: Fujitsu Limited (Kanagawa, JP)
Primary Examiner: Ton; Dang
Assistant Examiner:
Attorney, Agent or Firm: Helfgott & Karas, P.C.
A line switching control system provided in each of stations connected by a first type line and a second type line in a synchronous communication network system in which frame data including an overhead is transmitted through the first type line or the second type line between the stations. The line switching control system includes a protection switching unit for switching the first type line used as a work line to the second type line defined as a protection line in a predetermined switching mode when a failure occurs in the first type line, and a unit, when the failure first type line is recovered, for transmitting line recovery mode information representing whether a line recovery mode is a REV mode in which the recovered first type line is reverted as the work line or a NON-REV mode in which the second type line is continuously used as a new work line and the recovered first type line is defined as a new protection line, the line recovery mode information being included in the overhead of the frame data. |
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DETAILED DESCRIPTION Accordingly, a general object of the present invention is to provide a novel and useful line switching control apparatus in a synchronous communication network system in which the disadvantages of the aforementioned prior art are eliminated.
A specific object of the present invention is to provide a line switching control apparatus which can detect that stations having different recovery modes are connected in a synchronous communication network system in which information regarding line recovery is transmitted using a predetermined byte in overhead of frame data.
The above objects of the present invention are achieved by a line switching control system in each of stations connected by a first type line and a second type line in a synchronous communication network system in which frame data including an overhead is transmitted through the first type line or the second type line between the stations, the line switching control system comprising: protection switching means for switching the first type line used as a work line to the second type line defined as a protection line in a predetermined switching mode when a failure occurs in the first type line; and means, when the failure first type line is recovered, for transmitting line recovery mode information representing whether a line recovery mode is a first mode in which the recovered first type line is reverted as the work line or a second mode in which the second type line is continuously used as a new work line and the recovered first type line is defined as a new protection line, the line recovery mode information being included in the overhead of the frame data.
According to the present invention, the information regarding the line recovery mode set in a station is transmitted to a remote station using the overhead included in the frame data.
Thus, in the remote station, it can be determined, based on the information, whether the line recovery modes set in both the stations are matched.
Another object of the present invention is to provide a line switching control apparatus defining operations in each of stations having different recovery modes connected to each other in the synchronous communication network system
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Telecommunications 
