ADTRAN TRACER 4206 Plan A - Manual (Page 60)

Section 6 Troubleshooting Guide TRACER 4106/4206 System Manual
60 © 2004 ADTRAN, Inc. 612804206L2-1A
at all. If the RF DOWN LED is not illuminated, then the TRACER 4106/4206 units are receiving a
suitable RF signal. Suitable RF power levels for low error rate communication will range from
-30 dBm to -100 dBm (TRACER 4106) or -30 dBm to -96 dBm (TRACER 4206) measured at the
N-type connector input on the TRACER 4106/4206 unit.
10. Resolve any signal level issues before proceeding.
11. Examine the RF LOW LED on the front panel of each TRACER 4106/4206. If this LED is
illuminated, then the TRACER 4106/4206 is receiving a relatively weak signal; however, if the RF
DOWN LED is not illuminated, then the received signal is being suitably processed by the
TRACER 4106/4206 system. If you are receiving a weak signal ( RF LOW is ON ), please verify
that the weak signal is not being caused by a faulty cable, an insufficiently tightened cable, or
some other installation-related problem. Also, make sure an unreasonably large attenuation value
has not been selected if you are using an attenuator on a workbench setup.
Use the tables in Section 2, Microwave Path Engineering Basics, of this manual to select the
proper free-space attenuation value (in dB) based on the estimated length of the microwave path.
Remember to subtract both antenna gains (local and remote) from the attenuator setting.
12. Initiate a line loopback on the local TRACER 4106/4206 unit and run a test pattern from the
connected T1 equipment. This will verify the connection between the T1 equipment and the local
TRACER 4106/4206 unit.
13. Command a link loopback on the remote TRACER 4106/4206 unit and run a test pattern from the
connected T1 equipment. This will verify the data path across the RF link.
Installing/Configuring T1 Hardware
1. If possible, attach any or all of the intended T1 hardware to the TRACER 4106/4206 units using
the same workbench setup. This step offers the perfect opportunity to configure your T1 hardware
for proper functioning with the TRACER hardware.
2. To significantly reduce the probability of an unsuccessful field installation, resolve any remaining
T1 equipment-to-TRACER 4106/4206 configuration issues before field installation. See pages 57
and 58 for more information on resolving T1 interface alarm conditions.
External pattern generators are required to test data path integrity. A T1 BERT tester is
suggested.