User's Manual

60 TransNET OEM Integration Guide 05-3946A01, Rev. C
9.3 Troubleshooting Chart
Table 25 provides suggestions for resolving system difficulties that may be
experienced in the radio system. If problems persist, contact the factory for
further assistance. Refer to the inside back cover of this guide for contact
information.
Table 25. Troubleshooting Guide
Difficulty Recommended System Checks
Unit is
inoperative.
a. Check for the proper supply voltage at the power connector.
b.The transceiver’s internal fuse may have opened.
Interference is sus-
pected.
a. Verify that the system has a unique network address. Nearby sys-
tems with the same address will cause interference.
b.Check for interference by locking out affected zone(s) using the
SKIP command (Page 53).
c. If omnidirectional antennas are used on Remote stations, consider
changing to directional antennas. This will often limit interference
to and from other stations.
No synchroniza-
tion with Master,
or poor overall
performance.
a. Check for secure interface connections at the radio and the connect-
ed device.
b.Check the antenna, feedline and connectors. Reflected power
should be less than 10% of the forward power reading (SWR 2:1
or lower).
c. If the Remote radio is in synchronization, but performance is poor,
check the received signal strength using the RSSI command
(Page 50). If RSSI is low, it may indicate antenna problems, or mis-
alignment of directional antenna headings.
d.Verify proper programming of system parameters: 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 properly programmed at each extension;
Remotes are using the proper values for XPRI and XMAP.
e. Check for alarms using the STAT command (Page 54)
BER is too high.
Data throughput is
spotty.
a. The RETRY and REPEAT commands may be increased to deal
with interference, or decreased to increase throughput and reduce
latency.
b.Try turning on FEC. FEC on gives some coding gain, but comes at
the cost of reduced throughput.
Latency is too
high.
a. Reduce the REPEAT count.
b.Turn BUFF OFF. BUFF ON ensures that no gaps occur in the data,
but this comes at the cost of increased latency.
c. Make sure HOPTIME is set to 7.