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General
Alarm conditions occur whenever an optical problem or "fault" condition is detected by the TC1540. Under
normal operation, following LEDs should be lit
"POWER," "O-SYNC," "TD," and " RD."
Following LEDs may be "ON" or "OFF" depend on applications:
"COLL"- for trouble-shoot, not used. It should be off at all times.
"DRVMD"- turned on only when "OUT" terminal blocks are in "driver" mode.
"RS-485"- turned on when TC1540 is configured as RS-485 interface. (see DIP switch settings).
Power On LEDs Flash
When power first applied to TC1540, all the LEDs flah for two to three seconds.
Alarm Conditions
When alarm condition
Optic Cable Types
Conventionally, fiber optic cable with yellow-colored insulation is used for Single Mode applications; gray
or orange-colored insulated cable is for Multimode use. If Multimode cable is used in a Single Mode
application, the test results could be erroneous and confusing.
Calculating the Fiber Optic Loss Budget
The fiber optic link and/or connectors are frequently the source of various problems. Check out the
connectors and the integrity of the link first. Ideally, the link should be calibrated for total loss after the
installation has been completed.
To calculate the loss budget:
Multimode 850nm
Multimode 1310nm
Single Mode 1310nm
Single Mode 1550nm
Chapter 3 - Troubleshooting
Power Indicator:
On -
Unit's power supply is adequate
Off -
Power is not reaching the unit
Optic Sync Indicators:
Flashing -
The optic cable is broken or the cable connector is not inserted
correctly.
On -
Optic signal is valid.
Reverse Polarity:
On -
The input RS422/RS485 signal's polarities are reversed.
The "IN-" and "IN+" are reversed, also maybe "OUT-" and "OUT+".
:
:
:
:
Optic signal lost or below sensitivity level.
3 dB loss per km on 62.5/125µm cable*
2 dB loss per km on 62.5/125µm cable*
0.5 dB loss per km on 9/125µm cable*
0.4 dB loss per km on 9/125µm cable*
- 14 -
TC1540D User's Manual
Rev. 1.2
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