Lucent Technologies FiberReach DDM-2000 - Page 345

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Circuit Pack Descriptions
Issue 3 June 2000
7-89
29G-U/29H-U OLIU Circuit Pack Description (Long Reach
OC-12 Interface)
7
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Optical/Copper Specifications
For direct optical loopbacks, at least 10 dB of optical attenuation is needed
for the 29G-U optical line. The distributed feedback laser supplies an NRZ-
coded signal. 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 span engineering rules. Transmit and receive powers are
referenced to points S and R as shown in Figure 7-34. Detailed
specifications and link budget information for the 29G-U OLIU is included in
Chapter 10, Technical Specifications. Note that the 29G-U OLIU is not
specified to operate over multimode fiber.
For direct optical loopbacks, at least 10 dB of optical attenuation is needed
for the 29H-U line. The distributed feedback laser supplies an NRZ-coded
signal. 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 span engineering rules. Transmit and receive powers are referenced to
points S and R as shown in Figure 7-34. Detailed specifications and link
budget information for the 29H-U OLIU is included in Chapter 10, Technical
Specifications. Note that the 29H-U OLIU is not specified to operate over
multimode fiber.
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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.)
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Performance Monitoring (see Table 10-22)
— Section SEFS
— Line parameter B2
— STS pointer justifications (OC-3 Release 15.0).