User's Manual

Teklogix 9150 Wireless Gateway User Manual 115
Chapter 5: Base Station Configuration
Narrow Band Radio Parameters
Collision Size
This parameter reduces the probability that random noise on the radio link will be
interpreted as a collision between terminals. Response time increases when the 9150
resolves collisions unnecessarily.
Collision Size places an upper limit on the number of characters that are received
prior to the receipt of an error message (CRC, CD lost, etc.). If eight is the value of
this parameter, eight or less characters followed by an error message appearing over
the radio link are considered noise. If there are more than eight characters, it is con-
sidered a collision. Acceptable values range from 3 to 15.
Free Window Factor
The value entered in this parameter determines if “free window mode” will be used.
In free window mode, all terminals that are not assigned any other window can use
the free window.
Entering a value of 0 (zero) in this parameter disables free window mode. Increas-
ing the value of this parameter increases the likelihood of a message being transmit-
ted in the free window.
Message Mode Limit
This parameter defines an upper limit to the number of messages that must be
queued for transmission before message mode polling starts. Accepted values range
from 0 to 7, where 0 disables message mode.
Note: The number of terminals and past events are also part of the algorithm
that determines whether or not to start message mode.
Callsign Period
A call sign is periodically transmitted as an audible Morse code signal. This
parameter specifies the interval in minutes between call sign transmissions.
Acceptable values range from 0 to 60. The federal agencies, Industry Canada and
the Federal Communications Commission in the United States, require that each
system transmit its own identification call sign every 15 minutes.
In countries where a call sign is not required, setting this parameter to 0 prevents the
transmission of any call signs, allowing for shorter poll time-outs in terminals and
faster channel switching.