2 - 10 ONline Ethernet 10BASE-FB Module Installati on a n d Operation Guide
Attenuation
It is possible for receivers to receive too muc h light when:
❑Using 85/125 and 100/140 micron fiber cables
❑Ports are close together on a link
Receivers can also receive too much light on 62.5 micron fiber and High
power on the 10BASE-FB Modules when:
❑Connecting to an 10BASE-FB product (6.25 dB loss required)
❑Connecting to another 10BASE-FB Module (.25 dB loss required)
In these two situations, swi tch the 10BASE-FB Module to Norm al power.
In all of the cases listed above, some attenuation is required to prev ent this
problem. This attenuation is cov ered by:
❑A moderate link length
❑The fiber optic connectors
Splicing
Many fiber optic installations employ the use of patch pan els to manage
expansion and topological changes. A typical patch panel consists of a set
of female to female bulkhead barrel co nnectors used to connect male fibe r
connectors on both side s. Th e optical power loss through a patch panel
therefore includes two connectors and a bulk head.
If a fiber optic cable breaks, the break is usually fixed by splicing the broken
ends together. Use one of th e following types of splicing metho ds:
❑Fusion – A fusion splice usually offers lower power loss, but the
fusion equipment is often bulky and costly.
❑Mechanical – A mechanical splice can be conveniently used in the
field when a fusion splice is not available. If a repair is made, make
sure that the fiber cable still meets the p ower loss guidelines.