Nortel SONET AccessNode Manual page 72

3-10 Tributary and optical tests for VTBM rings
Procedure 3-2 (continued)
Performing optical interface receiver sensitivity tests
Action
Step
AccessNode Vol 3B 323-3001-221 Issue 2.0
Action
CAUTION
Risk of traffic loss
Make sure the system being tested is not carrying live
traffic.
CAUTION
Risk of damaging circuit packs
Avoid touching any components on the printed circuit
board. Electrostatic-sensitive devices can be damaged
by electrostatic discharge. Always ground yourself
before handling the circuit pack.
DANGER
Risk of personal injury
Avoid direct exposure to laser beams or fiber. Follow
the precautions listed in Chapter 1 when handling
optical fibers.
CAUTION
Risk of damaging circuit packs
Never connect an optical level to the optical interface
receiver higher than:
− 4.0 dBm for OC-12 IR
− 7.0 dBm for OC-12 LR 1310 nm optics
− 8.0 dBm for OC-12 LR 1550 nm optics
− 8.0 dBm for OC-3 IR
− 10.0 dBm for OC-3 LR
0.0 dBm for VTBM IR and VTBM LR optics (for Northern
Telecom-only links)
− 8.0 dBm for VTBM IR and LR optics (Bellcore Midspan
meet specifications).
—continued—