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Cisco ONS 15454 DWDM Installation and Operations Guide, R6.0
September 2005
Chapter 10 Manage the Node
NTP-G86 Convert a Pass-Through Connection to an Add/Drop Connection
• For an OADM node—Connect the AD-xC-xx.x drop (TX) port to the AD-xC-xx.x add (RX) port.
Step 4 Physically connect the proper client interface to the correct add and drop ports.
Step 5 Delete the filter connections related to the pass-through connection that is being converted to an
add/drop connection:
a. In node view, click the Provisioning > WDM-ANS > Port Status tabs.
b. Highlight the pass-through connections between ITU channel add and drop port filters.
c. Click Delete.
Step 6 Create two new unidirectional OCHNCs (one heading east, the other heading west) to support the new
add/drop channels. See the “DLP-G105 Provision DWDM Optical Channel Network Connections” task
on page 7-10.
Step 7 As necessary, complete the “DLP-G99 Create a Provisionable Patchcord” task on page 6-11.
Step 8 As necessary, add an optical attenuator between the channel TX port of the OADM, 4MD-xx.x,
32DMX-O, or 32DMX card and the DWDM RX port on the TXP, MXP, or ITU-T line card.
Note If the channel is coming from a 32DMX-O, the optical power can be adjusted in CTC by
modifying the value of the internal per-channel variable optical attenuator (VOA).
Step 9 (Optional) The following verification steps might be needed for an intermediate node when a
pass-through connection is converted:
a. Verify that the received channels are at the specified power level. See the “NTP-G76 Verify Optical
Span Loss Using CTC” procedure on page 10-2 for instructions.
b. Verify that the added channels are equalized with the express channels within +/–1 dB.
c. If the channels are not equalized with the express channels within +/–1 dB, check the attenuation of
the VOAs.
d. Check all the fiber adapters to minimize their insertion losses. See the “NTP-G115 Clean Fiber
Connectors” procedure on page 13-25 for instructions.
Stop. You have completed this procedure.
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