Nortel SONET AccessNode Manual page 32

2-14 DS3 tests, STS-1 tests, and optical in-bay tests
Procedure 2-2 (continued)
Measuring optical receiver performance
Step
8
9
10
11
AccessNode Vol 3B 323-3001-221 Issue 2.0
Action
Note 1: Use QTRIB to make sure the tributary being used for testing is
connected to the optic under test.
Note 2: To maintain the STS-1 connections, you must remain in the same
NEUI screen where you entered the above CI commands.
If you
move from screen to screen
stay in the same screen
On the DS3/STS-1 test set, press Start/Stop twice to reset the error count to
zero.
The DS3/STS-1 test set indicates in process and displays 0 bit error.
Press the Single Bit Error Inject button three times.
The DS3/STS-1 test set indicates 3 bit errors received.
Reset the DS3/STS-1 test set and monitor for 15 minutes.
Requirement: The test set displays 0 bit error.
If the requirement is not met, try one or both of the following:
• the DS3/STS mapper or STS-1 interface card could be faulty. Repeat
steps 8 to 10, using a different DS3/STS mapper or STS-1 interface card.
• the OC-3/OC-12 interface circuit pack could be faulty. Repeat steps
3 to 10, using a different OC-3/OC-12 interface circuit pack.
Connect the output of the VOA to the optical power meter as shown in step 3.
CAUTION
Risk of damage to the optical receiver
For the NT7E02 OC-12 long-reach (LR) interface circuit
pack, received optical power must not exceed the following
safe level: −6.0 dBm. Refer to Site Installation Planning and
Engineering , 323-3001-200 in the Engineering,
Configuration, and Ordering Guide , Volume 1.
There are no damage levels for NT7E01 IR and LR,
NT7E02 IR, and NT7E05 IR and LR optical interfaces.
—continued—
Then
the connections are dropped
you can issue new commands without
affecting traffic