By Richard Nesin, president, HomePNA
Sometimes I am really impressed. MOCA’s Parameterized Quality of Service (PQoS) is one of the things that really impressed me – not the technology, but the marketing spin.
HomePNA 3.0, released in 2003 and standardized by the ITU in 2005 as G.9954, was designed specifically to provide parameter-based QoS. HomePNA 3.1 added important enhancements. MOCA announced PQoS October 2007 and they heavily promoted it and positioned their organization as the “first” to do it. See what I mean? So, the answer is yes! HomePNA 3.0 and 3.1 have featured parameter-based QoS from the very beginning -- only we call it guaranteed QoS and it’s better.
So why have QoS? Real-time data such as voice and video must be delivered on time with low errors. There’s no hiding it – if it’s late or has lots of errors, the customer will know it – clicks and pops, voice drop out, tiling on the screen, and you know the rest. Lots of technology has been developed by standards groups such as the Internet Engineering Task Force (IETF) and Institute of Electrical and Electronic Engineers (IEEE) to implement QoS. You can find QoS in telecommunication core networks, access networks, and cellular networks, however, it’s usually implemented differently depending on the network, application and carrier.
For home networks, guaranteed QoS has come to mean that certain “parameters”, key to the delivery of real-time data, are guaranteed by the home networking technology. These parameters are latency, the amount of time it takes for the data to get from one point to another; jitter, the variation in the time between data arriving; throughput, the amount of data you can send in a given time; and error rate. (See where PQoS gets its name?)
What’s the difference between HomePNA guaranteed QoS and MOCA’s PQoS? HomePNA QoS eliminates data “collisions” on the home network. It provides greater control at a lower level so it is more efficient and enables more data to be transferred.