DOCSIS 3.0 Tips (Extended version from that published in Communications Technology, June 1, 2009) By John Downey and Brady Volpe In Part I of this extended edition (original abbreviated version appeared in CT’s March 2009 issue) John and I discussed many general DOCSIS upstream issues that should be understood prior to deploying DOCSIS 3.0. In [...]
DOCSIS 3.0 Tips (Extended version from that published in Communications Technology, June 1, 2009) By John Downey and Brady Volpe The first part of this article (in CT’s March 2009 issue) discussed downstream potential issues, while this one focuses on the potential issues associated with upstream deployments. In particular, this article covers the critical upstream [...]
DOCSIS 1.0 enabled data over coax with a “best effort” service using a data request-grant methodology. DOCSIS 1.1 and subsequent specifications added guaranteed Quality of Service (QoS) by providing Unsolicited Grant Synchronization (UGS) which means that a cable modem does not have to send a data request in order to receive a bandwidth grant from the CMTS. The new UGS service is an enabling technology which has allowed cable operators to successfully deploy the highly revenue generating Voice-over-IP (VoIP) services. In the following sections I will illustrate the differences between best-effort (request-grant) and QoS (UGS) services.
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