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Tag Archives: ugs
DOCSIS and Cable Modems – How it works :: Quality of Service
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. Continue reading
Posted in DOCSIS 101
Tagged best effort, Cable Modem, CATV, CMTS, DOCSIS, docsis tutorial, eMTA, header check sum, jitter, MAC, MAP, mini-slot, QAM, QoS, Quality of Service, REQ, service flows, sid, tutorial, UCD, ugs, unsolicited grant synchronization, Voice-over-IP, VoIP
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