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Technical Specifications
Issue 3 June 2000
10-27
Long Reach OC-3 Interface (28G-U/28G2-U OLIU)
10
■
Optical Specification
The multilongitudinal mode laser transmitter supplies a non-return to zero
(NRZ)-coded signal. For direct optical loopbacks, no attenuations are
needed for the 28-type.
The 28-type OLIU long reach OC-3 interface supports span lengths up to
51km, assuming 0.45 dB/km single-mode fiber and the span engineering
rules outlined in Table 10-13. Transmit and receive powers are referenced
to Points S and R as shown in Figure 10-2. Table 10-12 and Table 10-13
provide detailed specifications and link budget information for the 28-type
OLIU.
■
Alarm Thresholding
The following parameters are monitored at the OC-3 interface:
— Loss of signal
— Loss of frame
— Loss of pointer
— 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 severely errored frame seconds (SEFS)
— Line parameter B2.
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