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Technical Specifications
Issue 1 December 1997 10-19
Table 10-10. OC-3 Rate OLIU Mixes — Maximum Link Budgets for SM Fiber (dB)
NOTE:
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. For example, a 21G/21G-U (low power) OLIU
transmitting to a 22F OLIU has a maximum SM link budget of 18.6 dB. In
the opposite direction, though, a 22F OLIU transmitting to a 21G/21G-U
(low power) OLIU has a maximum SM link budget of 15.0 dB. Be careful of
this asymmetry when planning and engineering a link having mixed OLIUs.
Note also that 21D/21D-U and 22D-U OLIUs will not operate when
transmitting into single-mode fiber.
Transmitter
Receiver
21G/
21G-U 21G2-U 22F
22G-U∗/
22G2-U
21D/21D-U/
22D-U
(Ctrld. Env.)
21D/21D-U/
22D-U
(Unctrld. Env.)
21G/21G-U
(high power)
25.0 25.0 25.0 25.0 24.8 22.8
21G/21G-U
(low power)
18.6 18.6 18.6 18.6 18.4 16.4
21G2-U 25.0 25.0 25.0 25.0 24.8 22.8
22F 15.0 15.0 15.0 15.0 14.8 12.8
22G-U∗/22G2-U 23.0 23.0 23.0 23.0 22.8 20.8
21D/21D-U/22D-U
(ctrld. env.)
n/a n/a n/a n/a n/a n/a
21D/21D-U/22D-U
(unctrld. env.)
n/a n/a n/a n/a n/a n/a
* 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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