Black Box TS250A, Руководство пользователя, Страница: 39 / 64

Attenuation
Chapter 3 Optical TAPs
39
rev. 1
mode cable. Check with the cable manufacturer to determine specific
attenuation rates.
Managing attenuation
Managing signal attenuation is critical for running a network at
optimal performance. A problem arises when a signal is attenuated so
much that the destination cannot interpret the signal or the signal fails
in route. Repeaters can help, but they can be costly and inconvenient
to implement. In general, unless a signal must travel a long distance or
is compromised by patch panels, there should not be a problem using
the 50/50 split ratio. The most efficient and cost-conscious way to
manage attenuation is to measure signal levels throughout the
network and place repeaters only when and where they are needed.
To determine if a light signal is at an acceptable level at any point on a
network, it is helpful to use an optical power meter. Optical power
meters measure signal power at a port, helping you determine
whether a device is receiving a strong enough signal and thereby
identifying if repeaters need to be placed. The meters are typically
inexpensive and are offered from a number of vendors.