IBM 8285 Nways, Installation And User Manual

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Fiber Cabling Guidelines
Some general guidelines to follow when planning and setting up an ATM network using fiber as the
backbone medium are as follows:
Ÿ When you use multimode fiber, it is recommended that you use 62.5 micron fiber that conforms with
IEEE 10BASE-F standards.
Ÿ
When you use singlemode fiber, it is recommended that you use 9 micron fiber that conforms with
IEEE 10BASE-F standards.
Ÿ Carefully note all sources of optical power loss, such as connectors, splices, patch panels, and type
of cable used.
Ÿ
Calculate the total power loss in each ATM fiber link and verify that the distance between the two
workgroup switch ports or between the workgroup switch port and an ATM user device does not
exceed the optical power budget.
Ÿ The power loss you calculate is valid for an ATM connection between two workgroup switch ports or
an workgroup switch port and an ATM user device. Each workgroup switch port regenerates the
optical signal at full strength as it was originally transmitted from the source end system in
the connection. Therefore, the difference between the total power loss and the optical power
budget should be re-calculated at each workgroup switch port in the end-to-end connection.
Appendix B. Cables, Pins and Connectors
199