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4.3
Troubleshooting Chart
Table 8
provides suggestions for resolving system difficulties that
may be experienced in the radio system. If problems persist,
contact the factory for further assistance.
Table 8: Troubleshooting Guide
Difficulty
Recommended System Checks
Unit is
a.Check for the proper supply voltage at the power
inoperative
connector.
b.The transceiver's internal fuse may have opened.
Interference is
a.Verify that the system has a unique network ad-
suspected
dress. Nearby systems with the same address
will cause interference.
b.Check for interference by locking out affected
zone(s) using the SKIP command.
c. If omnidirectional antennas are used on Remote
stations, consider changing to directional anten-
nas. This will often limit interference to and from
other stations.
No synchroniza-
a.Check for secure interface connections at the ra-
tion with Master,
dio and the connected device.
or poor overall
b.Check the antenna, feedline and connectors. Re-
performance
flected power should be less than 10% of the for-
ward power reading (SWR ≈ 2:1 or lower).
c. If the Remote radio is in synchronization, but per-
formance is poor, check the received signal
strength using the RSSI command. If RSSI is
low, it may indicate antenna problems, or mis-
alignment of directional antenna headings.
d.Verify proper programming of system parame-
ters: mode, network address, data interface baud
rate, transmitter power, CTS delay, etc. For
store-and-forward applications, also verify the
following: SAF is ON; extended address is prop-
erly programmed at each extension; Remotes
are using the proper values for XPRI and XMAP.
e.Check for alarms using the STAT command.
BER is too high.
a.The RETRY and REPEAT commands may be in-
Data throughput
creased to deal with interference, or decreased
is spotty
to increase throughput and reduce latency.
b.Try turning on FEC. FEC on gives some coding
gain, but comes at the cost of reduced through-
put.
Latency is too
a.Reduce the REPEAT count.
high
b.Turn BUFF OFF. BUFF ON ensures that no gaps
occur in the data, but this comes at the cost of in-
creased latency.
c. Make sure HOPTIME is set to 7.
MDS TransNET Quick Start Guide
05-4481A01, Rev. A
July 2009
4.4
Technical Assistance
Factory technical assistance is available by contacting GE MDS
during business hours (8:30 AM to 6:00 PM Eastern Time). Use
one of the following means to contact the factory:
Telephone: (585) 241-5510
E-mail: GEmds.TechSupport@GE.com
Web: www.GEmds.com
FAX: (585) 242-8369
Part 15 Notice
This Equipment has been tested and found to comply with the
limits for a Class A digital device, pursuant to Part 15 of the FCC
Rules. These limits are designed to provide reasonable protection
against harmful interference when the equipment is operated in a
commercial environment. This equipment generates, uses, and
can radiate radio frequency energy and, if not installed and used in
accordance with the instruction manual, may cause harmful
interference to radio communications. Operation of this equipment
in a residential area is likely to cause harmful interference in which
case users will be required to correct the interference at their own
expense.
This device complies with Part 15 of the FCC Rules. Operation is
subject to the following two conditions: (1) this device may not
cause harmful interference, and (2) this device must accept any
interference received; including interference that may cause
undesired operation.
Warning: Changes or modifications not expressly approved by the
manufacturer could void the user's authority to operate the
equipment.
GE MDS, LLC
175 Science Parkway
Rochester, NY 14620
General Business: +1 585 242-9600
FAX: +1 585 242-9620
Web: www.GEmds.com
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