HP ProCurve 520wl Wireless Access Point - Manual (Page 10)

802.11b versus 802.11a networks 802.11b versus 802.11a networks 802.11b versus 802.11a networks
feature list feature list feature list
feature feature ature 2.4 ghz 2.4 ghz 2.4 ghz
(802.11b) (802.11b) (802.11b)
5 ghz 5 ghz 5 ghz
(802.11a) (802.11a) (802.11a)
comments comments comments
802.11b versus 802.11a networks
The WL520 supports 802.11 wireless connectivity through the use of an 802.11a-compliant 5 GHz and 802.11b-compliant
2.4 GHz radio technology. The IEEE 802.11a standard adds support for a high-speed wireless physical layer in the 5 GHz
band using Orthogonal Frequency Division Multiplexing (OFDM). The standard requires support for data rates of 6, 12, 24,
and 54 Mbits/s. The WL520 unit supports the following data rates: 6, 9, 12, 18, 24, 36, 54 Mbits/s. The IEEE 802.11b
standard supports wireless physical layer in the 2.4 GHz band using Direct Sequence Spread Spectrum (DSSS). The standard
provides for data rates of 1, 2, 5.5, and 11 Mbits/s.
The WL520 device can be used with any combination of 802.11a and 802.11b radio cards. Note however, that only one
802.11a card with antenna adapter can be plugged into the WL520 unit at one time. You can have an 802.11a and an
802.11b card present in the WL520 device at the same time and 2.4 GHz and 5 GHz clients will be supported
simultaneously.
feature list
The IEEE standards that governs wireless communications are different for the 2.4 GHz band and the 5 GHz band. The table
below compares the software features supported for each type of card in the WL520 device:
fe feature 2.4 ghz
(802.11b)
5 ghz
(802.11a)
comments
Number of stations per BSS up to 250 up to 50
HTTP Server yes yes
Telnet / CLI yes yes
SNMP Agent yes yes
VLAN Support (2 User VLANs) yes yes
Emergency Reset to Default Configuration yes yes
DHCP Client yes yes
DHCP Server yes yes
TFTP yes yes
RADIUS Access Control yes yes
Fallback to Primary RADIUS Server
RADIUS Session Timeout
RADIUS Multiple MAC Address Formats
yes yes
RADIUS DNS Host Name Support yes yes
RADIUS Start/Stop Accounting yes yes
802.1X (EAP-MD5, EAP-TLS and EAP-TTLS) yes yes
802.1d bridging yes yes
MAC Access Control Table yes yes
Protocol Filtering yes yes
Multicast/Broadcast Storm Filtering yes yes
Proxy ARP yes yes
Configuration Support for MAC Features yes yes
ICMP Echo Response yes yes
Hardware Watchdog Timer yes yes
Roaming yes yes
Link Integrity yes yes
Automatic Channel Select yes yes
WEP yes yes Key lengths supported for 802.11b: 64-bit and 128-bit
Key lengths supported for 802.11a: 64-bit, 128-bit, and 152-bit
(Note: Some products refer to 64-bit as “40-bit”, 128-bit as “104-
bit”, and 152-bit as “128-bit”.)
WEP Plus (Weak Key Avoidance) yes No client support for 802.11a
WDS Relay yes
Remote Link Test yes
Link Test Responder yes No client support for 802.11a
Medium Density Distribution yes
Distance between APs yes
Ultra High Density yes
Closed System yes
Interference Robustness yes
Load Balancing yes No client support for 802.11a
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