User Manual

Appendix B Terminal Menu Reference
RFI-9256 Radio Modem User Manual Page 60 of 96
B.1.1 (2) Link Control Menu
*** Link Control Menu ***
Main Port: ARQ Retries = 50
Aux Port: ARQ Retries = 50
Network Fail Timer = 5000ms
Online Request Timer = 1000ms
Backoff Retry is Disabled
(A) Number of Retries for ARQ
(F) Network Fail Timer
(O) Online Request Timer
(B) Backoff Retries Enable/Disable
(Esc) Previous Menu
Enter Choice:
Figure 28: Link control menu
 Number of Retries for ARQ : The ARQ (automatic repeat request) controls the number of times
the radio will resend a packet of lost information before discarding the packet. This can be set as
high as 255 retries. Each serial port can be configured independently allowing for modes like
broadcast (where a low retry count is desirable) to co-exist with point-to-point or Hayes dial-up
modes on the same radio. This is done through the protocol link control menu outlined in
Appendix B.2.2.3.
 Network Fail Timer : The network fail timeout controls the time a slave waits when a signal is
lost before attempting to re-synchronise. The network link LED on the front panel also indicates
this loss.
 Online Request Timer : This timer controls the length of time between integrity checks between
radios running in point-to-point or Hayes dial-up modes.
 Backoff Retries Enable / Disable : When several slaves are to be connected simultaneously to a
single master, they should be configured with back-off retries. This allow for collisions between
the slaves to be resolved using exponential back off and retry.