Triple-Play Service Deployment

Chapter 3: Deploying and Troubleshooting Fiber Networks
independent fiber can be accessed, the operator can perform a
power level measurement with the fiber identifier. If the power
level is low, this indicates that the fault is between the test location
and the CO. If the power level is normal, this indicates the fault is
between the test location and customer premises. By performing
tests at multiple locations, the location of the fault can be
identified easily within a given zone.
Alternatively, the OTDR can be used to identify the faulty section.
To avoid interrupting customer traffic, the technician should use
an out-of-band test wavelength such as 1625 nm. If there is a
failure on the distribution network, then the fiber at the
distribution network is connecting only the customer
experiencing service disruption.The technician should disconnect
this fiber at a given connectorized test access and perform the
1625 nm test from this location. The fault can then be localized,
even if the complete FTTx network is in service.
Point-to-Point FTTx testing variation versus PON testing
Point-to-point FTTx networks are much easier to install and test,
and the processes are similar to the deployment of metro or long
haul optical networks. However, the fiber count is higher and the
distances are much shorter with a P2P network, thereby increasing
the installation cost.
P2P Network Deployment Stages
Stage Task
1 Fiber cable construction
2 Frame installation and connection
3 Fiber cable acceptance test
4 Equipment installation and test
5 Troubleshooting
67