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Cyan Z-Series Engineering and Planning Guide
Release 5.0
700-0023-05-00 Rev. 1
© 2013 Cyan, Inc. – All Rights Reserved.
P a g e
141
2.23 Optical Protection Switch
The Optical Protection Switch (OPS) uses low-loss switching technology to provide protection against fiber
cuts and failures. It provides redundant path protection for telecommunication transmission systems. The
OPS operates independent of rate, format, and wavelength.
The OPS provides 1+1 protection. It continuously monitors optical power on both its primary and secondary
links. If received optical power on the active link drops below a configured threshold, the OPS switches the
optical signal to the standby link within 25 ms.
Deploy the OPS in pairs, one at each end of an optical link.
Each OPS contains three field-replaceable modules:
•
OPS Interface Control Module
•
OPS Switch Plug-In Module, LC/UPC Connectors
•
OPS Dual Power Supply Module, -48 Vdc
2.23.1 1+1 Protection
At the transmit end of the optical trunk, a 50:50 optical splitter divides the signal for transmission onto
primary (T1) and secondary (T2) paths. At the receive end, the OPS selects the signal according to the
received optical power levels:
•
If optical power on the active receive path falls below the configured alarm threshold, the OPS
issues an alarm.
•
If optical power on the active receive path falls below the configured switch threshold, the OPS
switches to receive on the standby path.
Figure 71: OPS 1+1 Protection
Control Module
Switch Module
Power Module
Splitter
Switch
Splitter
Switch
OPS
OPS
Z-Series Line Card
Z-Series Line Card
Primary Path
Secondary Path
(e.g., PME/WSS/LAD)
(e.g., PME/WSS/LAD)