Radio Frequency Interference (Rfi) - NEC ElectraElite 48 System Hardware Manual

Electra Elite
Multiline Terminal off-Hook
More than 1-pair Twisted
Ground all unused pairs
at MDF.
RFI Cleared?
Yes
End.
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.
System Hardware Manual
B1

Radio Frequency Interference (RFI)

Is interference only on outside calls
or anytime station is off-hook?
RFI Event?
Check cable for the
affected terminal(s).
Twisted
pair?
No
No
On CO calls only
1-pair
Cable using 1-pair twisted
pair cable.
No
RFI Cleared?
Yes
End.
Issue 6
Remove one CO line
at MDF and test using
standard SLT.
No
RFI on CO
Lines?
Yes
Inform
Telco.
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