363-206-285
Technical Specifications
10-18 Issue 3 June 2001
Intermediate Reach OC-3 Interface (22F/22F-U/
22F2-U OLIU) 10
■ Optical Specification
The 22F/22F-U/22F2-U OLIU photonics meet or exceed SONET
intermediate reach specifications (TR 253-IR-1 MLM category). The
multilongitudinal mode (MLM
*
) laser transmitter supplies an NRZ-coded
signal. The PINFET receiver allows direct optical loopback without the use
of an external attenuator.
The 22F/22F-U/22F2-U OLIU intermediate reach OC-3 interface supports
span lengths up to 33 km, assuming 0.45 dB/km single-mode fiber and the
span engineering rules outlined in Table 10-8. Transmit and receive powers
are referenced to Points S and R as shown in Figure 10-2. Table 10-7,
Table 10-8, and Table 10-9 provide detailed specifications and link budget
information for the 22F OLIU.
■ Alarm Thresholding
The following parameters are monitored at the OC-3 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).
* A higher quality SLM laser may be used instead of an MLM laser.
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