Integrated digital loop carrier system with virtual tributary ma

Details Integrated digital loop carrier system with virtual tributary ma Integrated digital loop carrier system with virtual tributary ma

1995-06-06

1998-07-21

Chin, Wellington

Multiplex communications

Channel assignment techniques

Details of circuit or interface for connecting user to the...

379 9001, 370357, 370386, H04J 308

Patent

active

057843775

ABSTRACT:
An integrated digital loop carrier (IDLC) system includes digital line feeders and signal processors to interface with the feeders and to ultimately provide data to subscriber instruments. The system can be employed as a central office terminal (COT) or remote digital terminal (RDT) with analog, T1 or SONET feeders and any conventional link medium. Data are put in DS1 format and multiplexed onto optical loops for delivery to banks of channel units wherein the optical signals are translated to electrical signals for delivery to the channel units and subscribers. A method and apparatus is provided for mapping and demapping signals between virtual tributaries (VT) and digital signal formats in the RDT of an integrated digital loop carrier. An application-specific circuit provides such mapping and demapping functions as Floating Byte Synchronous VT to Locked Byte Synchronous VT, Floating Asynchronous VT to Locked Byte Synchronous VT, Floating Asynchronous VT to Floating Asynchronous VT, DS1 to Locked Byte Synchronous VT, DS1 to Floating Asynchronous VT, and DS1 to Floating Byte Synchronous VT.

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