Wireless LAN – WLAN
68
3.4
Configuration of WLAN parameters
BAT54-Rail/F..
Release
7.54
06/08
The radio channel selects a portion of the conceivable frequency band for
data transfer.
DFS 2 – ETSI 301 893 V1.3.1
The ETSI standard 301 893 version 1.3.1 is the latest set of regulations con-
cerning the operation of 5 GHz wireless LANs. In the context of the wireless
LAN modules used in the BAT Wireless Routers and BAT Access Points, this
standard is also referred to as DFS 2.
This standard makes tougher demands on the radar detection patterns used
when operating 5 GHz WLANs. The standard applies to all devices brought
into circulation after April 01, 2008. Devices brought into circulation before
this date do not have to meet this standard. In particular devices with older
WLAN chips (two- or three-chip modules) do not have to meet this standard
and, as such, do not have to be upgraded.
Hirschmann supplies LCOS firmware of the versions 7.30 (for the current
Wireless Routers and Access Points) and 7.52 (for BAT Wireless L-310agn
and BAT Wireless L-305agn) with DFS 2 support. These firmware versions
have different threshold values for radar pattern recognition than with the
former DFS.
Danger: In principle the operator of the WLAN is responsible for maintaining
the new ETSI standards. For this reason Hirschmann recommends that
you perform an update to a firmware version with DFS 2 support.
Note: In the 2.4-GHz band, two separate wireless networks must be at least
three channels apart to avoid interference.
Compatibility mode
Two different wireless standards are based on the 2.4-GHz band: the
IEEE 802.11b standard with a transfer rate of up to 11 Mbps and the
IEEE 802.11g standard with up to 54 Mbps. When 2.4 GHz is selected as the
frequency band, the data transfer speed can be set as well.
Note: Please observe that clients supporting only the slower standards may
not be able to register with the WLAN if the speeds set here are higher.
The 802.11g/b compatibility mode offers the highest possible speeds and yet
also offers the 802.11b standard so that slower clients are not excluded. In
this mode, the WLAN card in the access point principally works with the faster
standard and falls back on the slower mode should a client of this type log
into the WLAN. In the '2Mbit compatible' mode, the access point supports
older 802.11b cards with a maximum transmission speed of 2 Mbps.
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