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Technical Specifications
Issue 3 June 2001
10-45
The maximum link budget is not always symmetrical. A transmitter/receiver pair
may have one maximum link budget in one direction and another in the opposite
direction.
Table 10-19 details the maximum link budgets for each pairing of OC-3 rate OLIUs
when operating on multimode (MM) fiber. These numbers give the maximum
attenuation acceptable for proper operation of each transmitter/receiver pair. The
link must have no more than this much attenuation either from fiber loss, splice
loss, connector loss, external attenuators or a combination of these or the link will
not operate properly. The maximum link budgets for MM fiber were calculated
using the following margins. The first column of margins applies to any link where
there is at least one OC-3 OLIU (22F or 22G-U/22G2-U). The second column of
margins applies to links having two IS-3 (22D-U) OLIUs.
At Least One
OC-3 OLIU
IS-3 OLIUs
Only
MM Optical Path Penalty (dB)
Connector Loss (dB)
Unallocated Margin (dB)
4.0
1.5
1.5
1.6
1.5
2.0
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