Triple-Play Service Deployment

Chapter 9: Troubleshooting High Speed Data Service
Turn-up testing
Before a provider commissions DSL service, technicians must
check DSL performance from the CPE through the DSLAM, then
validate and confirm several protocol layers to verify that the
network can transport voice, video, and data service payloads. A
failure anywhere across any of the different layers—transport,
network or service—will cause the service to fail. Therefore, it is
important to check not only data rates between the NID and
DSLAM, but also to test the application-specific QoS metrics to
validate service quality. An efficient method to accomplish this
task is to use a test set that emulates the ADSL modem and
establishes connectivity with the DSLAM. The tester should also
emulate the subscribers’ CPE to validate and confirm voice, video,
and data services. Experience shows that many problems result
from CPE configuration errors as well as network provisioning.
Quickly identifying and proactively addressing these problems
saves time and expense that would otherwise be spent on repeat
service calls.
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