XDM® -100
XDM®-100H
417006-2005-013-A02
ECI Telecom Ltd. Proprietary
8-3
Optical Channel (OCH) Protection
OCH protection is currently the most popular method of optical protection for WDM
systems. The OCH protection mechanism transports each optical channel in two
directions, clockwise and counterclockwise. The shortest path is defined as the main
or working channel, whereas the longer path is defined as the protection channel.
The main benefit of OCH protection is its ability to choose the shortest path as the
working path for each channel separately. There are no dedicated working and
protection fibers – each fiber carries traffic with both working and protection signals
in a single direction.
By using double transponder cards with built-in OCH units, a dual traffic path goes
around the ring and is received by the main transponder if there are no failures, or by
the protection transponder in case of failures. The protected channels are user-
selected.
Figure
8-2: OCH protection scheme
Summary of Contents for XDM-100
Page 1: ...XDM 100 Miniature MSPP for Metro Access and Cellular Networks General Description ...
Page 3: ...XDM 100 ...
Page 8: ...Contents XDM 100 iv ECI Telecom Ltd Proprietary 417006 2005 013 A02 ...
Page 10: ...Contents XDM 100 vi ECI Telecom Ltd Proprietary 417006 2005 013 A02 ...
Page 12: ...Contents XDM 100 viii ECI Telecom Ltd Proprietary 417006 2005 013 A02 ...
Page 16: ...Introduction XDM 100 1 4 ECI Telecom Ltd Proprietary 417006 2005 013 A02 ...
Page 22: ...Applications XDM 100 2 6 ECI Telecom Ltd Proprietary 417006 2005 013 A02 ...
Page 30: ...System Characteristics XDM 100 3 8 ECI Telecom Ltd Proprietary 417006 2005 013 A02 ...
Page 44: ...System Design XDM 100 4 14 ECI Telecom Ltd Proprietary 417006 2005 013 A02 ...
Page 82: ...XDM 100H XDM 100 8 8 ECI Telecom Ltd Proprietary 417006 2005 013 A02 ...
Page 94: ...Glossary XDM 100 B 6 ECI Telecom Ltd Proprietary 417006 2005 013 A02 ...
Page 98: ...Index XDM 100 I 4 ECI Telecom Ltd Proprietary 417006 2005 013 A02 ...