ATL Telecom AM100 - Manual (Page 3)

3 ATL User Guide
AM100 M Modem
COMPLIANCE NOTES & SAFETY INSTRUCTIONS
Caution: - Hazardous voltages inside the equipment
Safety Instructions:
This apparatus must be installed and maintained by SERVICE PERSONNEL only
There are NO user serviceable parts inside the modem.
The mains plug on the equipment serves as the disconnect device, therefore a socket outlet shall
be installed near the equipment and shall be easily accessible
Caution: - Electrostatic sensitive devices inside the equipment
Electrostatic discharge (ESD) Warning:
Antistatic precautions should be observed at all times.
Power Rating Information - AC unit:
Voltage Range 85V-250V
Current Range 50mA-15mA
Frequency Range 50/60Hz
Power Rating Information - DC Unit:
Voltage Range -18V to -72V
Current Range 170mA-25mA
Safety Statements classification - NON traffic ports
The AC Mains input has a safety status of PRIMARY CIRCUIT
The AM100 AC unit is defined as a class 1 equipment and must be connected to a reliable earth
connection.
If the mains earth cannot be guaranteed to be PROTECTIVE EARTH, then a PROTECTIVE EARTH
conductor must be connected to the M3 stud on the rear panel of the unit.
The DC input has a safety status of TNV-2
22 ATL User Guide
AM100 M
Modem
8. TROUBLE SHOOTING
8.1 QUICK GUIDE TO BASIC FAULT FINDING
8.2 LINK PERFORMANCE
The AM100 modem has a number of features to aid in the testing of the data link. To check a data
link the following tests can be performed. The tests outlined will require the use of a Bit Error Rate
Tester (BERT).
8.2.1 LOCAL LOOP
With a BERT connected to the user interface a local loop will loop data back to the user interface
as shown below. If everything is ok, no errors should be detected i.e. the user interface is correctly
transporting data.
No Symptom Possible Fault Corrective Action
Replace fuse in mains lead. LEDs do not light Blown fuse 1
Modems do not
synchronise
2
Configuration of
modems incorrect
Check configuration
Lines not correctly
connected. Check that line pair are correctly
connected together.
Line attenuation
or noise too high
Select a lower data rate
External timing
signal incorrect Check external timing signal quality and
cable assembly. Check Configuration.
Internal fault Return unit for repair
Line attenuation
or noise too high
Select a lower data rate
External timing
signal incorrect Check external timing signal frequency
and quality.
Test loop active
Ensure that no tests have been activated
on either modem
Modems
synchronise with
high error rate
Modems
synchronise with
no data transfer
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