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Technical Specifications
Issue 3 June 2001
10-25
Long Reach OC-12 Interface (29H-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 29H-U.
The 29H-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 10-16 Transmit and receive powers are
referenced to points S and R as shown in Figure 10-2. Table 10-15 and
Table 10-16 provide detailed specifications and link budget information for the
29H-U OLIU. Note that the 29H-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 15.0 and later).
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