Lucent Technologies Release 6 manual Rule

DEFINITY Enterprise Communications Server Release 6	Issue 5
Installation and Test for Multi-Carrier Cabinets 555-230-112	May 1998
A Connecting Fiber Optic Cables
Optical Cross-Connect Hardware	Page A-15

Rule 1

Cross-connect the fiber optic cable between 2 lightwave transceivers. That is, run the cable from the TX connector on 1 transceiver to the RX connector on the other transceiver, and in reverse for the other cable. See the top half of Figure A-7. Multi-mode connections using an LIU for fiber cross-connects to remote EPNs are shown in the bottom half of Figure A-7. For single-mode connections, refer to Figure A-2.

Cross-connect the fiber optic cable between 2 lightwave transceivers for each connection (row) on the fiber optic cable running list as shown in the Customer Service Document.

Rule 2

For multi-mode fiber, use the 9823A (shortwave) transceiver for distances of up to 4900 feet (1494 m). Use the 9823B (longwave) transceiver for distances of up to 25,000 feet (7620 m). Ensure all 9823As connect to 9823As and all 9823Bs connect to 9823Bs.

For single-mode fiber, use the 300A single-mode fiber optic transceivers. Single-mode fiber is generally used to connect remote EPNs at distances of up to 115,000 feet (22 miles or 35 km). Single-mode fiber may require attenuators. It is usually more cost effective to use multi-mode fiber between cabinets when possible.

Rule 3

! CAUTION:

Do not route fiber optic cables and the B25A cables together.

Route fiber optic cables away from groups of other cables where they may be stretched by the weight of metal cable bundles. It may be necessary to run fiber optic cables with the I/O cables, such as in the cable slack manager or under a raised floor. In these cases, protect the cable by running it in a dedicated area if possible. When the cable must be run with other cabling, protect it by running it through flexible conduit. Use the following steps to route the cable:

1.Route the fiber optic cable up toward the top of the cabinet. The excess cable should be looped and draped from the B25A cable clamp.

2.Dress the cable running up the back of the cabinets by loosely tie wrapping the cable to the outside of the B25A cable clamp (do not put the cable inside the clamp holding the B25A cables).

Rule 4

Avoid bending fiber optic cables to a radius smaller than 1.5 inches (3.8 cm), to prevent mechanical stress on the cables. Plan the use of cable ties to avoid crimping the cable or creating a fixed stress point where, at a later time, movement of the cable causes it to exceed the minimum bend radius.