Y-Cable Protection Module - Cisco ONS 15454 DWDM Installation And Operation Manual

15.4.2 Y-Cable Protection Module

When the module is used in the coupler direction, the individual signals enter the module from the
CPL-RXn ports and pass through a passive star coupler to the CPL-TX port.
The coupler is not meant to combine both the protect and working client card signals. The module allows
a path for the working client transmit interface to connect to the network in the event the opposite
interface in the protection pair should fail (the protect interface switches to the working interface).
When the module is used in the splitter direction, the signal enters the module from the SPL-RX port
and is split through a passive star coupler to the SPL-TXn ports. This module, although designed to pass
wavelengths associated with the ONS 15454 32-channel plan, is not selective to specific wavelengths
(modules do not filter wavelengths).
Figure 15-11
Figure 15-11 1:2 Splitter and 2:1 Coupler (Y-Cable Protection) Module Block Diagram
SPLa SPLa
-TX1 -TX2
Figure 15-12
FlexLayer Module. This module has two versions, one for single-mode applications and the other for
multimode applications.
Figure 15-12 ONS 15454 Y-Cable Protection FlexLayer Module (Single-Mode)
Front Panel
Cisco ONS 15454 DWDM Installation and Operations Guide, R6.0
15-14
shows the block diagram of the Y-cable protection module.
CPLa CPLa
-RX1 -RX2
and Figure 15-13 show the physical appearance of the ONS 15454 Y-Cable Protection
CS-SM-Y
SPLb SPLb
-TX1 -TX2
Chapter 15 Shelf Hardware Reference
CPLb CPLb
-RX1 -RX2
SPLa-RX
CPLa-TX
SPLb-RX
CPLb-TX
September 2005