WIT2450
©
2000- 2005 Cirronet
™
Inc
38
M-2450-0000 Rev B
Set Alternative Frequency Band
This setting should be set to 0, for FCC-compliant operation in the US (this is the
default). When set to 1, avoids 802.11b bands 1 & 2. When set to 2, avoids 802.11b
bands 3 & 4. When set to 3, avoids 802.11b bands 5 & 6. When set to 4, avoids 802.11b
bands 7 & 8. When set to 5, avoids 802.11b bands 9 & 10. When set to 6, avoids 802.11b
bands 11 & 12 and is also compliant with French regulatory standards. When set to 7,
avoids 802.11b bands 1, 10, 11 & 12. When set to 8, avoids 802.11b bands 1 through 6.
When set to 9, avoids 802.11b bands 6 through 12. When set to A, avoids 802.11b bands
1, 2, 3 & 11. If the WIT2450 is to be used in close proximity to 802.11b networks, these
alternative hopsets can be used to avoid interfering with the 802.11b networks.
Note: This parameter affects the setting of
wn
(Hopping Pattern).
Set Hop Duration
Sets the length of time the transceiver spends on each frequency channel. A smaller
value will allow the remote to lock on to the base signal faster at system startup, and will
generally decrease packet latency. A larger value increases network capacity, due to
decreased overhead in channel switching. The hop duration is specified in 69.4µs
increments. The default value of
90H
corresponds to a duration of 10ms. The maximum
value of
FEH
is 17.627ms. For best results, do not specify a duration of less than 3 ms.
This value only needs to be set in the base which broadcasts the parameter to all remotes.
However, link time can be reduced if this value is also programmed into the remotes,
which use it as a starting value when scanning for the base.
Set Minimum Data Length
This sets the minimum threshold number of bytes required to form a packet in transparent
mode. The radio will wait until the
data transmit delay
elapses before sending a data
packet with less than this number of bytes. Can be used to keep short, intermittent
transmissions contiguous. In packet modes, the length parameter in the data packet will
override this value (See Section 3.1). This value is subject to the
maximum data length
even in packet mode. See
Get Maximum Data Length
below.
Get Maximum Data Length (remote only, read only)
This parameter indicates the largest number of bytes that a remote will transmit per hop,
based on the size of the slot it has been allocated by the base. In general more remotes
mean less data can be transmitted per remote. By reading this parameter and dividing by
the hop duration, the remote's data rate capacity can be determined. Attempting to send
protocol mode packets longer than
maximum data length
will result in the packet being
discarded without being sent. See Section 2.3.3 on the tradeoffs between
hop duration
and data length.
Set Maximum Number of Remotes (base only)
This parameter limits the number of remotes that can register with a given base. The
default is 62 remotes which is the maximum number of remotes that can be registered
with a base at one time. This command is useful when used in conjunction with global
roaming for load balancing when base stations are collocated. It is also useful to assure a
minimum remote throughput.
