Dsc Communications Corporation

Alcatel USA

Martin Roberts

Thomas A Potter

R Douglas Howson

A transport interface (,) provides add drop multiplex functionality and termination requirements for the transportation of network traffic. The transport interface (,) includes high speed units (,), broadband interfaces (,), and SONET formatters (,). Each high speed unit (,), broadband interface (,), and SONET formatter has redundant protection pairs (A and B). The high speed units (,), broadband interfaces (,), and SONET formatters (,) communicate with each other by in-band datalinks (,). The redundant protection pairs (A and B) communicate with one another by protection pair datalinks (,). The in-band datalinks (,) and the protection pair datalinks (,) provide protection switching within the transport interface (,) in the event of component failure. The in-band datalinks (,) are generated out of available or consumed bytes within either a section overhead (,) or a line overhead (,) of SONET OC-N frame (,). The protection pair datalinks (,) provide communication capability over a common control communications interface. The in-band datalinks (,) and the protection pair data links (,) work together to provide a smooth transition from one component to another in the event of a protection switch.

Transport interface for performing protection switching of telecommunications traffic

A transport interface (10) provides add drop multiplex functionality and termination requirements for the transportation of network traffic. The transport interface (10) includes high speed units (12), broadband interfaces (16), and SONET formatters (18). Each high speed unit (12), broadband interface (16), and SONET formatter has redundant protection pairs (A and B). The high speed units (12), broadband interfaces (16), and SONET formatters (18) communicate with each other by in-band datalinks (40). The redundant protection pairs (A and B) communicate with one another by protection pair datalinks (42). The in-band datalinks (40) and the protection pair datalinks (42) provide an effective means for performing protection switching within the transport interface (10) in the event of component failure. The in-band datalinks (40) are generated out of available or consumed bytes within either a section overhead (32) or a line overhead (34) of SONET OC-N frame (30). The protection pair datalinks (42) provide communication capability over a common control communications interface. The in-band datalinks (40) and the protection pair data links (42) work together to provide a smooth transition from one component to another in the event of a protection switch.

Transport interface for performing protection switching of

A multi-rate transmission system (10) includes a receive section (12) and a transmit section (14). The receive section includes a receiver (16), a clock recovery unit (18), and a serial to parallel converter (20) all operating at a first clock rate (M). The receiver (16) also has a frame recovery unit (22) that operates at any of a plurality of clock rates, including the first clock rate (M) and a second clock rate (M/n). When the frame recovery unit operates at the first clock rate (M), frame information received by the receiver section (12) has unique bits occupying each bit position associated with each clock pulse of the first clock rate (M). When the frame recovery unit (22) operates at the second clock rate (M/n), each unique bit of the frame information occupies a number of bit positions according to a ratio of the first clock rate (M) to the second clock rate (M/n). Similar operation occurs with respect to a frame formatter (30) in the transmit section (14) of the multi-rate transmission system (10).

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Milton Keynes, United Kingdom

Martin Roberts