AT&T 555-230-894 manual Install Fibre-Optic Cables, Fibre-Optic Cable Operation

Install Fibre-Optic Cables

Install Fibre-Optic Cables

This section discusses the hardware and methods required to connect and route fibre-optic cables.

The Expansion Port Network (EPN) cabinet is normally positioned next to the Processor Port Network (PPN) cabinet(s), but may also be installed in a different room or a different building. Fibre-optic cables connect the cabinets together.

Fibre-Optic Cable Operation

Fibre-optic cables carry signals between the cabinets that compose your switch. To do this, the electronic signals at the connectors on the back of a cabinet are converted into optical signals. The optical signals from another cabinet are then converted back into electronic signals. AT&T provides opto- electronic devices, the 9823-type lightwave transceivers, that perform this task.

A completed signal from one cabinet goes through a transceiver, a fibre-optic cable, and another transceiver to reach another cabinet. If the two cabinets are close together, the optical signal may go through a single, directly connected fibre-optic cable. If the two cabinets are far apart, it may be convenient to connect the cabinets through the cross-connect field.

Figure 4-13shows how to connect fibre-optic cables for direct connections.

Figure 4-14shows how to connect fibre-optic cables through a cross-connect field. .

Locate Fibre-Optic Cable Connections

Packed with the system is a Customer Service Document (CSD) that includes an “Inter-Cabinet Cable Running List.” Each row on the list represents a fibre-optic cable connection.

The list includes the AT&T comcode of the cable to be used, its length (in feet) and the addresses of each cable’s source and destination. These addresses include the numbers of the cabinets, carrier positions, and slots to which you are to connect the cables. Use the information from the Running List to determine where to connect each fibre-optic cable.

Figure 4-12illustrates an example Running List.

Issue 1 September 1995 4-19