Installation guide

Wireless Guide 129
Advanced Features for Wireless Analysis
802.11 Long PLCPs The number of PLCP PDUs seen with the “long”
preamble and header during this capture
session. This form of PLCP PDU is compatible
with legacy equipment from older wireless LANs
and supports and operates at either 1 Mbps or 2
Mbps.
Data Rate Counters These counters vary depending on the
monitored network:
• For 802.11b/g networks, there are separate
counters for the number of frames sent at 1,
2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 72,
108 Mbps.
• For 802.11a networks, there are separate
counters for the number of frames sent at 6,
9, 12, 18, 24, 36, 48, 54, 72, and 108 Mbps.
• For legacy 802.11b cards, the speeds
remain at 1, 2, 5.5, 11 Mbps.
NOTE: 802.11g is backward-compatible with
802.11b, therefore the speed counters seen in
802.11b are also shown in 802.11g.
802.11b and 802.11g share the same frequency
band (2.4 GHz) and same number of channels
(1-14). 802.11b goes from speeds 1 Mbps to 11
Mbps and 802.11g goes from speeds 1 Mbps to
54 Mbps. 802.11a and 802.11g share similar
speeds (6, 9, 12, 18, 24, 36, 48, 54, 72, and 108
Mbps – 72 and 108 Mbps are proprietary
implementations).
Table 10-8. 802.11 Counters in the Statistics Tab (2 of 2)
Counter Description