Cisco ONS 15200 Series, Инструкция по установке, настройке и эксплуатации

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4-18
Cisco ONS 15200 Installation, Setup, and Test Manual
78-13765-01
Chapter 4 Turn Up and Test
Figure 4-7 ONS 15201 SCU in a daisy-chain configuration
d. Attenuate the output of the A and B ports between -10 and -28 to avoid damage to the CLIP DWDM
receivers before looping them back.
e. Loop the B-side INPUT and OUTPUT ports together on the bottom SCU.
f.
Loop the A-side INPUT and OUTPUT ports together on the top SCU.
g. Run a fiber from the B-side OUTPUT port of the top SCU to the A-side INPUT port of the second
SCU.
Check each OUTPUT port with an OSA before connecting it to the next INPUT port and before
inserting the required number of attenuators. Verify that the level of the channel to be dropped at the
next SCU is within operating levels of the DWDM receivers. As a rough guide, the input power
should be between -25 and -10 dBm (receiver operating range is -30 and -8 dBm).
h. Repeat Step 3 f – g for all SCUs, connecting the B-side OUTPUT port to the A-side INPUT port as
shown in Figure 4-7 .
i.
From the bottom SCU, run a fiber from the A-side OUTPUT port to the B-side INPUT port of the
previous SCU. Check each OUTPUT port with an OSA before connecting it to next INPUT port.
j. Repeat Step 3 d. for all SCUs, connecting the A-side OUTPUT to the B-side INPUT, as shown in
Figure 4-7 .
k.
Verify that the level of the channel to be dropped at the next SCU is within operating levels of the
DWDM receivers. As a rough guide, the input power should be between -25 and -10 dBm (receiver
operating range is -30 and -8 dBm).
Step 20 To test unprotected channels, clear all errors on the test set and run the BER test error-free for 15
minutes. Complete Step
20 in Table B-11 on page B-7 .
Step 21
Test A-side protected channels and all unprotected channels:
a. Disconnect the jumper cable on the B-side INPUT port of the bottom SCU in loopback mode.
b.
Reconnect the B-side jumper cable and verify that all protected SCUs identify the A side as Active
and the B side as Standby.
54913
Test Box
Rx
Tx
A
Client
Client
Client
B
Out
In
A B
A B
Out
In
Out
In