PCA transmission apparatus and PCA transmission method

Details PCA transmission apparatus and PCA transmission method PCA transmission apparatus and PCA transmission method

1994-03-03

1996-04-09

Safourek, Benedict V.

Multiplex communications

Wide area network

Packet switching

340827, H04B 340

Patent

active

055068332

ABSTRACT:
A redundantly constructed protection channel access transmission apparatus includes current units and spare units by which protection channel access data can be transmitted even if any one of the current units or spare units is in an alarm state. In a normal state, the current units transmit work data and the spare units transmit the protection channel access data. When any one of the current units is in an alarm state, a selector selects work data and supplies the work data to a secondary spare unit. Then, the secondary spare unit performs a signal processing in place of the current unit. On the other hand, when any one of the spare units is in an alarm state, the selector also selects protection channel access data in the same way and the secondary spare unit performs a signal processing in place of the spare unit. With this arrangement, even if any one of the current units or spare units is in an alarm state, the secondary spare unit is selected and processes the signal of the current unit or spare unit in the alarm state, whereby both of the work data and protection channel access data can be transmitted as they are.

REFERENCES:
patent: 4656645 (1987-04-01), Kaneko
patent: 4680776 (1987-07-01), Ikeuchi et al.
patent: 5014261 (1991-05-01), Shinbashi et al.
patent: 5069521 (1991-12-01), Hardwick

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