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HCS - Header Check Sequence

By: Preethi Ramkumar

Meaning of HCS – “Header Check Sequence”, The present invention relates generally to a communication device; and, more particularly, it relates to a method for efficiently performing Header Check Sequence (HCS) operations in a cable modem having programmable MAC functionality. In the cable modem 100 the CRC engine 102 is provided to perform single-cycle computations on input data of variable length. The CRC engine 102 may be utilized, for example, to provide high-performance Header Check Sequence (HCS) calculations as used in both downstream and upstream MAC operations, and may receive data directly from the programmable MAC via a data register 104.

The validation process commences in step 400, where initialization information is written to the configuration register 106. The initialization information, as previously noted, may include an initial CRC vector and/or criteria for determining the type of CRC to be computed. For example, DVD-compliant systems perform HCS operations, but use a different CRC polynomial that DOCSIS-compliant systems. The programmable nature of the CRC engine 102 allows it to support either type of system. Configuration information may be provided by the programmable MAC 108 or other software process

Other Related Definitions:

“…The HCS field is a 16-bit CRC that ensures the integrity of the MAC Header, even in a collision environment. The HCS field coverage MUST include the entire MAC Header, starting with the FC field and including any EHDR field that may be present. ” [JLSNet Forum]

“…The final component of the Segment Header is an 8 bit Header Check Sequence (HCS). The HCS contains an 8 bit CRC calculated on the Segment Header (i.e. VCI, Payload Type and Segment Priority) and provides for detection, and optional correction of single-bit errors in the Segment Header. Detection of errors is mandatory, and correction is optional.” [Data Communications International]

Related Links:

Manuals - Articles about HCS
PROCESSING REQUIREMENTS - Information about HCS

Technical Resources:

Cisco - Cisco uBR10012 Router Functional Overview Of HCS

Products and Solutions:

Sierra

Blogs, News, feeds…

http://www.jlsnet.co.uk/index.php?tab=3&page=projects_docsis_chap3c

Books:

Wireless Communication Standards by Todor Cooklev

See Also:

HCS - Header Check Sequence

 

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