Out-of-band embedded overhead architecture for a transmission network
Patent 5452306 Issued on September 19, 1995. Estimated Expiration Date: 
September 7, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
September 7, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesCarrier terminal unit Unitary PCM rate converter and multiframe buffer Telecommunications FIFO Multiplexing arrangement for a digital transmission system System for cross-connecting high speed digital signals Serial transport frame format method Patent #: 5060229 InventorsAssigneeApplicationNo. 117936 filed on 09/07/1993US Classes:370/465, Adaptive370/524Using a dedicated signaling channel (i.e., D-channel)ExaminersPrimary: Kizou, HassanAttorney, Agent or FirmInternational ClassH04J 003/12AbstractAn interface is disclosed that formats a first link (a source link--e.g., a T1 link) having N channels to fit into a second link (a source link--e.g., a PCM-30 or a doubled T1 link) having N+M channels. Each of the first and second links are implemented with primary rate carrier links, and have a standard payload portion and a standard overhead portion. A mechanism is disclosed for routing information between the first link and the second link, so that information being transported over the first link can also be transported over the second link. An adding mechanism is also disclosed for routing supplemental overhead information to at least one added overhead channel within the second link, wherein the added overhead channel occupies a standard payload portion of the second link. An overhead information bit is disclosed, which transmits information within a (k)th bit of an (l)th channel of each frame of the second link. An information bit signal is formed with at least five consecutive of the (k)th bits. Using the formed information bit signal, information is conveyed regarding the communications link. A path overhead byte is provided for transportation within the added overhead channel of the second link, and includes various overhead bits, including, e.g., the information bit noted above, for performing several maintenance and performance monitoring functions. Four of the bits within the path overhead byte are essentially equivalent to bits within an overhead byte provided for SONET networks.Other References
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