05-6193A01-A - GE Digital Energy

Enabling LBT andSetting its BehaviorSetting LBT ChannelWait TimesTo activate the LBT feature, select the Listen Before Transmit menu item,and press the spacebar to change the field at the right to ON.The LBT menu provides a minimum and maximum channel wait timethat may be set as required. These settings refer to the time period (inmilliseconds) to wait after the channel is free before transmission isallowed.Minimum wait time: Normally, the minimum channel wait time shouldnot be changed from its default setting of 0 ms unless performingadvanced operations, such as staggering the responses from multipleRemotes.Maximum wait time: Normally, this setting should not be changed fromits default of 100 ms unless performing advanced operations. Someexamples 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 toohigh, in which case a lower value can be entered.• Collisions over the air are too high, in which case a higher valuecan 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 transmissionlatency.To change the channel wait times, proceed as follows:1. Select the desired menu item (Min Channel Wait or Max Channel Wait).The field to the right of the item clears and a flashing cursorappears.2. Enter the desired wait time(s) in milliseconds and press thekey to apply the change.ENTERSetting LBT Timeoutand Packet ActionThe LBT menu provides a setting for the maximum time to wait (in milliseconds)for the channel to become free, referred to as Timeout (MS) onthe menu. When this time is exceeded, the radio follows the actiondefined in the Packet Action on Timeout menu setting (either Drop or Send). Tochange the timeout setting, proceed as follows:1. Select Timeout (MS) from the menu. The field to the right of the itemclears and a flashing cursor appears.2. Enter the desired timeout time in milliseconds and press thekey to apply the change.ENTER24 SD Series Serial-Telnet Supplement MDS 05-6193A01, Rev. A