GE MDS SD Series Reference Manual page 56

Enabling LBT and
Setting its Behavior
Setting LBT Channel
Wait Times
48 SD Series Ref. Manual (Packet & Transparent Mode)
peer-to-peer configurations,
choices depend on the data transmission characteristics of the connected
system. This, and all other LBT parameters, are set using the LBT Set-
tings Menu (Figure 37).
Figure 37. Listen Before Transmit (LBT) Settings Menu
To activate the LBT feature, select the
and press the spacebar to change the field at the right to
The LBT menu provides a minimum and maximum channel wait time
that may be set as required. These settings refer to the time period (in
milliseconds) to wait after the channel is free before transmission is
allowed.
Minimum wait time: Normally, the minimum channel wait time should
not be changed from its default setting of
advanced operations, such as staggering the responses from multiple
Remotes.
Maximum wait time: Normally, this setting should not be changed from
its default of 100 ms unless performing advanced operations. Some
examples of when this may be beneficial include:
• There is a need to stagger responses from several Remote radios.
• The transmission latency from the time the channel is free is too
high, in which case a lower value can be entered.
• Collisions over the air are too high, in which case a higher value
can be entered.
It should be noted that the lower the value of the Maximum Wait Time,
the higher the chances of collisions occurring over-the-air. Conversely,
the higher the value of the Maximum Wait Time, the higher the trans-
mission latency.
To change the channel wait times, proceed as follows:
may be preferred. Optimal
Listen on TX
Invisible place holder
Listen Before Transmit
ms unless performing
0
MDS 05-4846A01, Rev. C
menu item,
.
ON