Voice-over-IP Archives

19 09, 2012

See Us | SCTE EXPO Workshop DOCSIS and EPON

Mia Colabrese2012-09-19T03:30:12-04:00September 19th, 2012|

EPON, EPoC, DPoE, RFoG, DOCSIS®-Beyond the Alphabet Soup Operators’ services are migrating from traditional to IP delivery, which is driving a need for an evolution in the access network. Technology changes to the access network are a multi-year deployment cycle, so operators are investigating and trialing different technologies for next generation delivery. This session will explore the pros and cons, technical and financial trade-offs, and possible hybrid approaches of these various technologies. Moderator: Brady Volpe, CTO & Founder, The Volpe Firm, Inc. Advanced DOCSIS® vs. EPoC: A Residential Case

13 09, 2012

See Us | SCTE EXPO 2012 Symposium

Mia Colabrese2012-09-13T02:00:24-04:00September 13th, 2012|

DIGITAL HOME SYMPOSIUM The Digital Home: Preparing for the Future Conference Event—registration required Space is limited! Tuesday, Oct. 16 10:00 am-5:00 pm The one-day pre-conference Digital Home Symposium will focus on the need to drive an optimized experience within the customer premises. The symposium will offer expert presentations and in-depth discussions on the latest technologies, standards and operational processes found in the new and constantly evolving digital home. The symposium is designed to help all levels of the cable system operator and vendor workforces to create and implement

9 03, 2009

DOCSIS and Cable Modems – How it works :: Quality of Service

Mia Colabrese2021-08-17T13:22:59-04:00March 9th, 2009|

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.

16 02, 2009

Troubleshooting DOCSIS – VoIP Impairments > Delay & Jitter

Mia Colabrese2021-08-17T15:54:55-04:00February 16th, 2009|

In this blog I will address delay and jitter as they pertain to VoIP in a DOCSIS network. Delay, jitter and packet loss are the three primary impairment in a VoIP network, but packet loss was addressed in my Troubleshooting DOCSIS - VoIP Impairments > Packet Loss blog. After packet loss, delay is the second most disruptive impairment in VoIP networks. The effects of delay to the caller generally appear as echo and talker overlap. In PSTN communications, echo can arise as acoustic echo between the mouthpiece and

15 02, 2009

Troubleshooting DOCSIS – VoIP Impairments > Packet Loss

Mia Colabrese2021-08-17T15:45:30-04:00February 15th, 2009|

In this blog I am going to focus on VoIP packet loss, which is just one of the three (3) primary types of VoIP impairments that are present in a DOCSIS network. I will cover many RF and IP terms in this blog that I have not discussed in my previous tutorials, not to worry! This terminology is all fodder for future blogs. :-) To review, the three fundamental impairments which impact call quality of VoIP communications are as follows: * Packet Loss – The complete or partial loss of a packet containing actual voice payload. * Delay – The time a packet takes to traverse the space between the source and destination of a voice call. The space is comprised of both the physical distance the data must travel in addition to the active network routing and switching elements, which contribute additional delay. * Jitter – The variance of inter-packet arrival time from one transmitted packet to the next sequential packet.

13 02, 2009

Troubleshooting DOCSIS – VoIP Impairments

Mia Colabrese2023-02-18T10:49:47-05:00February 13th, 2009|

In this blog I am going to digress for a moment from my standard DOCSIS 101 tutorial and spend a little time on DOCSIS troubleshooting basics, especially with respect to Voice-over-Internet Protocol (VoIP). I am doing this as due to many offline questions specific to this topic. Don't worry, though I may start to inter-mix some troubleshooting blogs now and again, just check the DOCSIS 101 page to stay on top of the latest DOCSIS tutorial blogs.