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Chapter 22: The 9160 G2 As Base Station
Connectivity Options: Base Station Mode
Size of Poll Windows
The value assigned to this parameter determines the largest message that can be passed
between the 9160 G2 and the mobile computer in a normal poll window. The window size
can be adjusted to accommodate anywhere from 5 to 32 characters.
Larger windows increase the polling period and can increase the response time. Smaller
windows increase the number of message and long message polls, and can also increase the
response time.
Important: In "Cellular" mode, the minimum value for this parameter is 8.
Maximum Message Segment Size
This parameter determines the largest single message that can be passed to a mobile com-
puter in message mode or from a mobile computer in long message mode. In a 9160 G2 base
station, the value entered in this parameter must be greater than or equal to the value entered
in the network controller or 9160 G2 mini-controller. The range of this parameter is between
32 and 116 characters. (Longer messages are broken into several packets.) The default value
is 100.
Number of Retries
This parameter determines how many times the 9160 G2 attempts to resend a message if an
acknowledgement is not received from the mobile computer. (These retries do not necessar-
ily occur in consecutive polls because incomplete messages are returned to the bottom of the
message queue.) After all retries have been exhausted, the mobile computer is declared "of-
fline". The 9160 G2 does not transmit any messages to the mobile computer until the mobile
computer declares itself "online". The allowable values range from 1 to 7.
Collision Size
This parameter reduces the probability that random noise on the radio link will be inter-
preted as a collision between mobile computers. Response time increases when the 9160 G2
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 considered a collision. Acceptable values
range from 3 to 10.
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Psion Teklogix 9160 G2 Wireless Gateway User Manual
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