User guide

Power supply issues
PWR LED remains off
The iMux system isn’t receiving proper power.
AC power
• Check AC power using a multimeter.
DC power
• Check power at the DC terminals using a multimeter.
• No AC power can be detectable on the DC power line.
• Check wiring for nicking, scoring or poor termination.
Verifying fiber cable
Verify the fiber cable when incoming signal is good, but the other end indicates that a fiber signal is not being
received. To test the fiber cable, use a fiber optic cable test set with light source and meter.
iMux System Fiber Test Specifications
Fiber Type
Wavelength
Attenuation
Maximum Distance
Multimode
850nm
10dB max.
1.5 miles (2.5km)
Single-mode
1310nm
8dB max.
9 miles (15km)
Single-mode
1310nm
8dB required min. loss
37 miles (60km)
When reconnecting fiber cables, check the correct connection of the fiber cable.
Module installation
The iMux comes standard with modules pre-installed and pre-configured. When replacing or installing any
modules, use caution to ensure that
• The modules are fully inserted without damaging any components on the circuit board
• The locking screws are completely seated and hand tightened only
• The breakout adapter cables (where used) are properly connected and seated
• The optical modules are protected at all times with dust cap or fiber connector installed
• Special handling requirements are observed
If the iMux module configuration is changed, or modules are moved to a different tributary slot, the system must
be reconfigured accordingly using the VT100 management interface.
Troubleshooting! 115