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Cisco ONS 15454 DWDM Installation and Operations Guide, R6.0
April 2006
Chapter 16 Card Reference
16.9 Transponder and Muxponder Protection
16.9 Transponder and Muxponder Protection
Two types of protection are available:
• Y-cable protection
• Splitter protection
16.9.1 Y-Cable Protection
Y-cable protection is available for the following ONS 15454 transponder and muxponder cards:
• TXP_MR_10G
• TXP_MR_2.5G
• MXP_MR_2.5G
• MXP_2.5G_10G
To create Y-cable protection, you create a Y-cable protection group for two TXP or MXP cards using the
CTC software, then connect the client ports of the two cards physically with a Y-cable. The single client
signal is sent into the Rx Y-cable and is split between the two TXP or MXP cards. The two Tx signals
from the client side of the TXP or MXP cards are combined in the TX Y-cable into a single client signal.
Only the active card signal passes through as the single TX client signal. The other card must have its
laser turned off to avoid signal degradation where the Y-cable joins. See the “NTP-G33 Create a Y-Cable
Protection Group” procedure on page 5-10 as needed.
Figure 16-72 shows the Y-cable signal flow.
Note Loss of Signal–Payload (LOS-P) alarms, also called Incoming Payload Signal Absent alarms, can occur
on a split signal if the ports are not in a Y-cable protection group.
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