Triple-Play Service Deployment
Triple-Play Service Deployment
Triple-Play Service Deployment
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26<br />
ISP/Internet<br />
ASP &<br />
Video Headend<br />
Video<br />
Core Router Aggregation<br />
– Heavy high priority traffic (voice/video)<br />
could congest aggregation point 1 if<br />
the number of simultaneous sessions is<br />
not rate limited<br />
– Data traffic could also create contention<br />
to voice and video if no QoS scheduling<br />
– Incoming traffic > egress link size<br />
Video<br />
Server<br />
Chapter 2: <strong>Triple</strong>-<strong>Play</strong> <strong>Service</strong> Delivery over Ethernet Networks<br />
(Note: Video deployment and testing is described in detail in Chapter 7.)<br />
The stability, scalability, and functionality of the Ethernet network<br />
may have tremendous effect on the actual transport quality of<br />
video service. In addition, it is important to understand that the<br />
quality of the transport carrying these services contributes to the<br />
overall QoE for the subscriber. Therefore, the ability to correlate<br />
errors that take place in the Ethernet (aggregation) network to the<br />
access network will enable providers to more quickly and<br />
efficiently troubleshoot problems, provide solutions, and thereby<br />
keep customers satisfied.<br />
In this aggregation network, packet loss and packet jitter are key<br />
metrics that have impact on the pixelization, tiling, frame freeze,<br />
and the overall QoE. Moreover, video stream characteristics such<br />
as the program clock reference (PCR) jitter measurement,<br />
depending on where measured, can be affected by overall<br />
network packet jitter, which again may surface in the Ethernet<br />
aggregation portion of the network.<br />
Core<br />
10GE<br />
10GE<br />
Congestion<br />
Point<br />
10GE<br />
Edge Aggregation Router (EAR)<br />
– Video traffic could stall lower or equal<br />
priority traffic if the number of simultaneous<br />
sessions is not rate limited; or,<br />
MM traffic could stall lower priority<br />
video traffic<br />
– DSLAM traffic consumes other DSLAM<br />
bandwidth resulting in unbalance and<br />
fairness issues<br />
Metro<br />
Figure 2.7 Network Potential Congestion Points<br />
CO<br />
CO<br />
Congestion<br />
Point<br />
BRAS<br />
EAR<br />
VSO<br />
Access c<br />
10GE<br />
VHO<br />
1GE<br />
CO<br />
MMM<br />
DSLAM<br />
CO traffic af<br />
10GE<br />
1GE<br />
DSLAM<br />
– Subscriber traffic exceeds<br />
DSLAM link size<br />
Congestion<br />
Point<br />
Customer Premises<br />
Agg 1 Agg 2 Agg 3 Agg 4
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