HP ProCurve 520wl Wireless Access Point - Manual (Page 22)

802.11b/g compared to 802.11a Networks
The 520wl supports 802.11 wireless connectivity through the use of 802.11a-compliant 5 GHz, 802.11b-compliant 2.4
GHz, and 802.11g-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 Mbps. The 520wl supports the following data rates: 1, 2, 5.5, 11, 6,
9, 12, 18, 24, 36, 48, 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 new IEEE 802.11g standard adds support for a high-speed wireless physical layer in the 2.4 GHz band using
Orthogonal Frequency Division Multiplexing (OFDM). The standard requires support for data rates of 6, 9, 12, 18, 24,
36, 48, and 54 Mbps.
The 520wl can be used with any combination of 802.11a, 802.11b, and 802.11g AP Cards. You can have an 802.11a
and an 802.11b or 802.11g card present in the 520wl at the same time and 2.4 GHz and 5 GHz clients will be
supported simultaneously. Note however that only one 802.11a card with antenna adapter can be plugged into the
520wl at one time.
Feature List
The IEEE standards that govern 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 520wl:
Feature 2.4 GHz
(802.11b)
2.4 GHz
(802.11g)
5 GHz
(802.11a)
Comments
Number of stations per AP up to 250 up to 128 up to 128 This information corresponds to a cas where no
encryption is enabled. For more information about the
number of stations supported when using different types
of encryption, please see the table “Number of Stations
per BSS” located in appendix A.
HTTP/HTTPS Server yes yes yes
Telnet / CLI yes yes yes
SNMP/SNMPv3 support yes yes yes
VLAN Support (16 User VLANs) no yes no
Emergency Reset to Default
Configuration yes yes yes
DHCP Client yes yes yes
DHCP Server yes yes yes
TFTP yes yes yes
RADIUS Mac-based Access Control yes yes yes
Fallback to Primary RADIUS Server yes yes yes
RADIUS Session Timeout yes yes yes
RADIUS Multiple MAC Address Formats yes yes yes
RADIUS DNS Host Name Support yes yes yes
RADIUS Start/Stop Accounting yes yes yes
802.1X (EAP-MD5, EAP-TLS and EAP­
TTLS) yes yes yes
802.1d bridging yes yes yes
MAC Access Control Table yes yes yes
Protocol Filtering yes yes yes
Multicast/Broadcast Storm Filtering yes yes yes
Proxy ARP yes yes yes
Roaming yes yes yes
Link Integrity yes yes yes
Automatic Channel Select yes yes yes
WEP yes yes yes Key lengths supported for 802.11b: 64-bit and 128-bit
Key lengths supported for 802.11a and 802.11g: 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) 1 yes no no
WDS Relay yes yes yes
Remote Link Test 1 yes no no
Medium Density Distribution 1 yes no no
Distance between APs yes no no
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