3com 3CRWXR10095A User Manual

C

HAPTER

 16: M

ONITORING

 

THE

 N

ETWORK

To display RF environment statistics, in the RF Monitor window, select the 
RF Environment tab at the bottom of the window. 

Table 56 lists the information displayed on the tab.

Table 56   RF Monitor Environment Columns

Channel

Radio channel to which the other columns apply.

Noise

Noise threshold on the active channel. RF Auto-Tuning 
prefers channels with low noise levels over channels with 
higher noise levels.

CRC Errors

Number of frames received by the radio on that active 
channel that had CRC errors. A high CRC error count can 
indicate a hidden node or co-channel interference.

PHY Errors

Number of packets that could not be decoded by the 
MAP. This condition can have any of the following causes:

„

Collision of an 802.11 packet. 

„

Packet whose source is too far away, thus rendering 
the packet unintelligible by the time it reaches the 
MAP.

„

Interference caused by an 802.11b/g phone or other 
source.

It is normal for this counter to be about 10 percent of the 
total RxByte count. It is also normal for higher data rates to 
have higher Phy error counts than lower data rates.