Triple-Play Service Deployment

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Chapter 5: Troubleshooting the Premises Wiring
Emerging Home Networking Standards: MoCA and HPNAv3
Multimedia over Coax Alliance (MoCA)
MoCA is a home networking standard that occupies a 50 MHz band operating
above the typical cable TV signal band. It can provide multiple high speed channels
that coexist with up to 8 nodes per channel. MoCA provides a raw data rate of up to
270 Mbps and has a typical data rate of greater than 100 Mbps in a majority of the
installations. A common approach is to use one frequency for a 100 Mbps data
network and a separate frequency for a 100 Mbps IPTV network.A key benefit of the
MoCA approach is the ability to work over existing coax and through multiple
splitters in a home. MoCA can be configured to scan automatically for active
channels so it can train itself to find the best frequency. Figure 5.2 illustrates the
manner in which MoCA will adapt to and overlay with existing services.
5-42
Upstream
4-12 VDSL
4-21 HPNA
5-42
Upstream
4-12 VDSL
4-21 HPNA
MoCA spectrum options
54-806/860
Off the air/Cable
54-806/860
Off the air/Cable
MoCA
MoCA MoCA MoCA
950-2150
Satellite L-Band
Figure
5.2
HPNAv3
HPNAv3 can be run over twisted pair phone lines or coax or a combination of both.
It is designed to provide guaranteed QoS and priority service flows. These factors
combine to make HPNAv3 a technology well suited for QoE sensitive applications
such as live HD television or VoIP. HPNAv3 operates in the 4-48 MHz range so it does
not easily coexist with a DOCSIS cable modem or an interactive cable STB.In an IPTV
installation HPNAv3 frequencies can be adjusted, such as 12-28 MHz, to co-exist
with other services using frequencies below 12 MHz. HPNAv3 operates with a
master-slave relationship with all communications being coordinated by the
master. Direct peer-to-peer communications can occur but they must be scheduled
through the master.