Nortel SONET AccessNode Manual page 83

Procedure 3-3 (continued)
Performing DS1 switching tests
Action
Step
1
2
3
4
5
6
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 was completed in Procedure 3-2 on page 3-7.
With the protection and one working DS1 VT mapper circuit pack (G1 to G12)
equipped, apply a DS1 input signal to the circuit pack, port 1 only, at the local
DSX-1 cross-connect panel.
At the cross-connect panel, daisy chain all the DS1 ports of the working
DS1 VT mapper circuit pack. For example, port 1 OUT to port 2 IN, port 2
OUT to port 3 IN, and so on. Connect port 14 OUT to the DS1 receiver error
detector. See Figure 3-2 on page 3-22 and Figure 3-3 on page 3-23.
Make sure all the DS1 facilities of the working mapper are activated (IS) by
entering:
↵
facility ds1 <gx> all
↵
query <gx>
where
<gx> is the number of the working mapper (g1 to g12)
Access the detailed protection screen for DS1 by entering:
↵
protectn
↵
dtlprot ds1
Set up STS-1 connections and establish DS1 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 entered 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—
AccessNode Site Testing Procedures 323-3001-221 Issue 2.0
Tributary and optical tests for VTBM rings 3-21