Triple-Play Service Deployment

Chapter 9: Troubleshooting High Speed Data Service
Service verification
A true test of end-to-end service requires verifying access to that
service. Technicians must use a test instrument in IP ping mode to
verify the routing connectivity across the network to an IP host or
server while assessing packet loss rates and packet delay to and
from the ping destination.The instrument should check the IP layer
by verifying whether another host device is alive and able to echo
back; use a flood mode to gauge network congestion; and,
determine the minimum, maximum, and average packet delay
time of IP packets. Tracking packet delay and loss helps determine
whether delays and slow service are due to provider error or CPE
problems.
Since users can only reach the ISP end of the service with the
correct username, password, and encapsulation, test tools must
support the appropriate IP encapsulations and authentication
protocols for effective IP ping support.
High Speed Data over FTTx
Validating data service over an FTTx access network is similar to
DSL access topology testing. The technician must:
– Establish connectivity, to the ISP
– Provision necessary network elements for increased data flow
and class of service treatment
– Reconfigure DSLAM ports for dual latency path support for the
mixed IP application environment
To complete the installation process, field personnel must verify
DSL physical layer performance, ISP connectivity and ISP and data
service throughout. FTP throughput testing with selectable file
sizes in both upload and download direction establishes the
performance of the link in a way that much more closely matches
actual use cases than a simple download test. HTTP testing using a
Web browser must be completed to ensure that the end users’
ISP access/connectivity is working properly.
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