Nortel SONET AccessNode Manual page 90

3-28 Tributary and optical tests for VTBM rings
Procedure 3-4 (continued)
Performing DS3 switching tests
Action
Step
1
2
3
4
5
6
AccessNode Vol 3B 323-3001-221 Issue 2.0
Action
Make sure all the optical circuit packs are in loopback, this means that the
fiber connected to the receiver plug (Rx) comes from the transmitter (Tx) of
the same circuit pack. At a VTBM node, this must be done for OC-12 G1 and
G2. This is completed in Procedure 3-2 on page 3-7.
With the protection and one working DS3/STS mapper circuit pack equipped
(G1 to G4), apply a DS3 input signal to the circuit pack, port 1 only, at the
DSX-3 cross-connect panel.
At the cross-connect panel, daisy chain all the DS3 ports of the working
DS3/STS mapper circuit pack (that is, port 1 OUT to port 2 IN, port 2 OUT to
port 3 IN). Connect port 3 OUT to the DS3 receiver error detector. See
Figure 3-4 and Figure 3-5.
Make sure all the DS3 facilities of mapper Gx are active (IS) by entering:
↵
facility ds3 <gx> all
↵
query <gx>
where
<gx> is the number of the working mapper (g1 to g4)
Access the detailed protection screen for DS3 by entering:
↵
protectn
↵
dtlprot ds3
Set up STS-1 connections and establish DS3 traffic by entering:
csci
↵
slat <p or s>
where
<p> is used if primary optics are being tested.
<s> is used if secondary optics are being tested.
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 typed the CI commands. If you move from one
screen to another, the connections are dropped. If you stay in the same
screen you can issue new commands without affecting traffic.
—continued—