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Technical Specifications
10-20 Issue 3 June 2001
Long Reach OC-12 Interface (24G-U) 10
■ Optical Specification
The distributed feedback laser supplies a NRZ-coded signal. For direct
optical loopbacks, at least 15 dB of optical attenuation is needed for the
24G-U.
The 24G-U OLIU long reach OC-12 interface supports span lengths up to
51 km, assuming 0.45 dB/km single-mode fiber (including splices) and the
span engineering rules outlined in Table 10-11. Transmit and receive
powers are referenced to points S and R as shown in Figure 10-2.
Table 10-10 and Table 10-11 provide detailed specifications and link
budget information for the 24G-U OLIU. Note that the 24G-U OLIU is not
specified to operate over multimode fiber.
■ Alarm Thresholding
The following parameters are monitored at the OC-12 interface.
— Loss of signal (LOS)
— Loss of frame (LOF)
— Loss of pointer (LOP)
—LineAIS
— B2 thresholding signal fail
— B2 thresholding signal degrade. (B2 signal degrade thresholds are
user settable in the range from 10
-5
to 10
-9
BER.)
■ Performance Monitoring (see Table 10-23)
— Section SEFS
— Line parameter B2.
— STS pointer justifications (Release 11.0 and later).
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