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Technical Specifications
Issue 3 June 2001
10-43
OC-3 Optical Interface Mixing 10
Mixing different OC-3 rate OLIUs at opposite ends of an optical link is often necessary for
technical reasons or for convenience. The following information will aid in planning and
engineering optical links having different types of OC-3 rate OLIUs at each end of the fiber.
Table 10-17 details the minimum link budget necessary for each pairing of OC-3 rate OLIUs.
To use Table 10-17, locate the number at the intersection of the transmitter/receiver pair of
interest. This number is the minimum attenuation necessary for proper operation of that
transmitter/receiver pair. The link must have at least this much attenuation either from fiber loss,
splice loss, connector loss, external attenuators, or a combination of these, or the receiver will
be overdriven and the link will not operate properly.
The minimum link budget is not always symmetrical. A transmitter/receiver pair may have one
minimum link budget in one direction and another in the opposite direction.
Table 10-17. OC-3 Rate OLIU Mixes - Minimum Link Budgets (dB)
Transmitter
Receiver
22F 22G-U∗
22G2-U
22G3-U
22G4-U
22D-U (Ctrld/
Unctrld Env.)
22F-U/
22F2-U
22F
22F-U/22F2-U
22G-U∗
22G2-U
0.0
0.0
7.0
7.0
0.0
0.0
7.0
7.0
0.0
0.0
0.0
0.0
6.0
6.0
14.0
14.0
0.0
0.0
0.0
0.0
22D-U
(ctrld./
unctrld. env.)
0.0 0.0 0.0 0.0 0.0
*The LAA10 FT-2000 OC-3 Optical Interface has the same optical loss
budget as the 22G-U and therefore should follow the same optical mixing
rules.
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