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Technical Specifications
Issue 3 June 2001
10-21
Long Reach OC-12 Interface (24H-U) 10
■ Optical Specification
The distributed feedback laser supplies a NRZ-coded signal. For direct optical
loopbacks, at least 10 dB of optical attenuation is needed for the 24H-U.
The 24H-U OLIU long reach OC-12 interface supports span lengths up to 96 km,
assuming 0.25 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 24H-U OLIU.
Note that the 24H-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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