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Technical Specifications
Issue 3 June 2000
10-31
Long Reach OC-12 Interface (29G-U OLIU)
10
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Optical Specification
The distributed feedback laser supplies an NRZ-coded signal. For direct
optical loopbacks, at least 10 dB of optical attenuation is needed for the
29G-U.
The 29G-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 10-16. 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 29G-U OLIU. Note that the 29G-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)
— Line AIS
— 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 10-3 and Table 10-23.)
— Section SEFS
— Line parameter B2
— STS pointer justifications.
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