Triple-Play Service Deployment

212
Figure 8.5 PVA-1000
While checking the various call options, the technician will be able
to monitor the quality of the RTP stream. Field technicians listen to
calls using handheld units to determine voice quality. They also
look at the MOS of each connection to help make an objective
analysis of the voice quality. The two main values a technician will
want to examine are the R value (derived from the E-model) and
the MOS value. The technician can compare those values with the
SLA defined by the carrier who owns the service.
2 Wire Local Loop
Rx and Tx
Superimposed
Figure 8.6 Echo caused by impedance mismatch
Central Office
2 Wire
4 Wire
Hybrid
Chapter 8: Troubleshooting VoIP
Receive
Direction
Transmit
Direction