Nortel Meridian Companion PCI User Manual page 78

Display screens 73
negative numbers. The larger the RSSI measure, the stronger the
radio signal (for example, -55 dBm is stronger than -80 dBm).
Links lost in RSSI ranges stronger than the normal RSSI cell
boundary value may indicate internal interference caused by links
established on the same channel in nearby cells.
When links are lost from ranges below the normal RSSI cell
boundary value, the indication is that cell layout is ineffective or that
users are attempting to go outside the bounds of the area covered by
the wireless system.
The dialogue window gives commentary on the strength of the
RSSI range from which most links were lost.
P0886303 Issue 01 Standard Companion Diagnostic Software for PCI User Guide