Design and field deployment of a protected FTTH GPON access network serving 1,000 users. The backbones
of the network are presented and the contribution of each element to the FTTH network architecture is
addressed. The design integrates class B protection, to provide redundancy in feeder and GPON port, the
practical implementation of a protected FTTH network is strongly emphasized.
PRECONNECTED FIBER OPTIC CABLES:
The use of pre-connectorized cables is particularly significant. Although the use of
factory-terminated cross-connection assemblies and jumpers is acceptable, the use of a
pre-connectorized backbone and distribution cable presents special installation techniques.
These connectors need protection when installing the connected end of these cables. Protective
handles are available to protect the connectors, but the external diameter of the handle can prevent
installation in small ducts or conduits. The size of the pre-connectorized assembly and traction
handle must be taken into account prior to ordering factory connected cables.
UTILIZATION OF DUCT:
When pulling long lengths of wire onto a duct, a fill rate of less than 50% per cross-section is
recommended. For instance, a cable is equivalent to a 0.71 inch outside diameter cable in a 1 inch
inside diameter conduit.
Several cables can be pulled at the same time since the pull load is applied equally to all cables.
Filler ratios can dictate higher fiber counts for future requirements. A jacket can be more compact
with fibers than several cable covers.
PROTECTION FOR CABLE:
If future cable runs in the same duct or conduit are a possibility, the use of the innerduct to
sectionize the available duct space is recommended. Without this sectionalization, additional cables
may become tangled and cause a service disruption.
Where the cable is installed in cable trays, cable trays or attached to other cables, the movement
of existing cables should be considered. Although the fiber optic cable can be moved into service
without affecting the performance of the fiber, it may warrant conduit protection in areas exposed
to physical damage.
CABLE SLACK
A small amount of soft cable (20-30 ft) may be useful in the event that repair or cable movement is
required. If a cable is cut, the slack can be shifted to the damaged point, necessitating only one
splice point in the permanent repair rather than two splices if an additional length of cable is
added. As a result, labour and material costs are reduced and budget savings are lost.
Concentrate on Speed Deployment:
The faster the implementation, the faster the subscribers will be operational and the faster you
will be able to charge them for new services. Therefore, find ways to standardize equipment and
methodologies, while ensuring that all crews are trained in best practices. This will ensure
consistent, high-quality deployments delivered in a timely manner.
