Lucent Technologies FiberReach DDM-2000 - Page 491

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Technical Specifications
Issue 3 June 2000
10-17
Intermediate Reach OC-3 Interface (22F/22F-U/
22F2-U OLIU)
10
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Optical Specification
The 22F/22F-U/22F2-U OLIU photonics meet or exceed SONET
intermediate reach specifications (TR 253-IR-1 MLM category). The 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 10-7. Transmit and receive powers
are referenced to Points S and R as shown in Figure 10-2. Table 10-6,
Table 10-7, and Table 10-8 provide detailed specifications and link budget
information for the 22F-type OLIU.
■
Alarm Thresholding
The following parameters are monitored at the OC-3 interface.
—LOS
—LOF
—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.)
■
Line PM (See Table 10-3 and Table 10-23.)
— Section SEFS
— Line parameter B2
— STS pointer justification (OC-3 R11.0 and later)
— STS-1 Path PM. (See Table 10-3 and Table 10-23.)
* A higher quality SLM laser may be used instead of an MLM laser.