Interference - Nortel Meridian Companion PCI User Manual

Interference

P0886303 Issue 01 Standard
WARNING C501
Evaluation Channel(s) <channel number(s)> are under-
utilized. Interference is suspected.
Description This warning occurs when the spectrum has more
channels occupied in the upper segments than in the lower segments.
Normally the lower segments are occupied before the upper
segments, but interference can cause this not to occur. Note that
interference in the system is not catastrophic, it simply reduces the
number of channels available for calls, and increases the probability
of call blocking. If possible, interference must be eliminated or
minimized to increase the number of channels available for calls.
Action Use the Background RSSI feature (described in the
"Monitor" section, Background RSSI) to detect the source of
interference near the channel(s) listed, in the following manner.
1. Ensure there are no calls on the wireless system by notifying the
users not to use their sets.
2. Run the background RSSI feature on one or more radios in each
cell. The display on the screen should be relatively flat, with
RSSI levels between -95 and -110 dBm. If this is not observed,
there is a high probability of interference in or near the cell being
monitored.
3. The location of the interference can be deduced by noting the
cells that have a high RSSI on a given channel.
4. Eliminate or minimize (e.g., with shielding) the source of
interference.
Companion Diagnostic Software for PCI User Guide
Appendix B 117