Comtech EF Data OMS11 - Manual (Page 52)

OMS11 1:1 Redundancy Switch Maintenance and Troubleshooting
TM133 – Rev. 1.1 6-1
Maintenance and Troubleshooting
6
6.0 Basic Troubleshooting and Maintenance
This section provides information on the basic troubleshooting and repair procedures for the
OMS11 1:1 Switch that may be performed on-site by qualified personnel. Only minor repairs will
be discussed. For serious failures, the user should not attempt to repair the unit without first
contacting the Radyne Customer Service Department at 602-437-9620 for further information and
instructions.
6.1 Basic User Checks
Upon the detection of an operational failure, the source of the failure must be determined. Basic
user checks include checking the various cables and connectors.
6.1.1 Checking the Cabling and Connectors
Problems that appear difficult to solve can often be traced to a loose or defective cable or
connector. The user should first verify the following:
• All cables within the system have no broken or loose connections. Cables that are
suspect should be replaced.
• All jacks on the units have no bent or broken pins.
• Both AC Power Cords are properly plugged into the rear of the OMS11.
6.2 Major and Minor Faults
Major faults are failure conditions or combinations of conditions that result in loss of service on
one or more channels. Minor faults are failure conditions that do not result in loss of service.
Possible Major Fault conditions are:
A Read-Only Memory (ROM) failure in the Switch;
A Random Access Memory (RAM) failure in the Switch;
A loss of Carrier Detect on a Demodulator Channel where this attribute is monitored;
A loss of Terrestrial Input Clock on a Channel where this attribute is monitored;
A failure of two monitored Modulators;
A failure of two monitored Demodulators;
A failure of both OMS11 power supplies.
Possible Minor Fault conditions are as follows:
A failure of one of the Switch’s two redundant power supplies;
A failure of one Demodulator that is being monitored (i.e., a Demodulator that has not
been locked out);
A failure of one Modulator that is being monitored;
A reference clock slip.