NEC Univerge SV8100, System Maintenance Manual

Page: 25 / 78

UNIVERGE SV8100 Issue 1.0
System Maintenance Manual 2 - 7
Frequency Interference (RFI)
Is interference only on outside calls
or anytime station is off-hook?
RFI Event?
Outside calls
Any off-hook
No
Check cable for the
affected terminal(s).
Remove one CO line
at MDF and test using
standard SLT.
RFI on CO
Lines?
Yes
Yes
Yes
No
No
No
End
End
RFI Cleared?
RFI Cleared?
Inform
Telco.
Twisted
pair?
More than 1-pair
Twisted
Ground all unused
pairs at MDF.
Cable with 1-pair twisted
pair cable.
Follow the steps below, one at a time, and test after each step.
1.
Place a 0.01 microfarad ceramic capacitor (0.001 microfarad for FM Interference)
across receiver and transmitter elements in the Multiline Terminal handset.
2. Add a 0.01 microfarad ceramic capacitor from one transmit lead to one receive lead.
B1