User's Manual

MDR2400-SR, MDR5800-SR and Orion 5825-SR
Issue 10 Page 121
10 APPENDIX: 1+1 PROTECTION SYSTEM OPERATION
Introduction
System Description
When a single radio link is used to convey user data, any number of unexpected
events may cause the link to fail resulting in user data being lost. This would require
immediate corrective actions from the network operator responsible for maintaining the
radio link. Since such a failure may occur at any time and possibly at a remote
location, corrective actions may be very costly, both in terms of downtime and human
resources. Common reasons for radio links to fail are:
• Signal fading on the radio link
• The presence of strong in-band interference
• Equipment failure
One possible solution to this problem is to install a second redundant radio link that
can automatically take over the function of the primary radio link. This not only
reduces the downtime of the link, but also provides the network operator with the
opportunity to repair the faulty link at a convenient time.
This document describes the one-plus-one redundancy system that can be used with
the radio products of Plessey BBW. Radio systems that are currently supported by the
system are:
• MDR2400-SR
• MDR5800-SR
• Orion 5810-SR
• Orion 5825-SR
The remainder of this document is aimed at giving a detailed technical description of
the redundancy system and the installation thereof.