User's Manual

USING INTERNAL MENU COMMANDS

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234839, Revision 2.2

*** Link Control Menu ***

Main Port: ARQ Retries = 50

Aux Port: ARQ Retries = 50

Network fail timer = 5000ms

Online request timer = 1000ms

(A) Number of retries for ARQ

(F) Network fail timeout

(O) Online requests timer

(B) Backoff Retry Enable/Disable

(D) Set to Defaults

(Esc) Previous Menu

Enter Choice:

Figure 6-4 Link Control Menu

(A) Number of retries for ARQ

The ARQ (automatic repeat request) controls the number of times the Radio Modem will try to resend

a packet of lost information before it gives up. This can be set as high as 255 retries. Each Link/Port

can be configured independently allowing for modes like broadcast to co-exist on the same modem, i.e.,

a broadcast mode would normal only retry 3-5 times. Default is 50 for both Main and Auxiliary ports.

To change the ARQ, press (A). The following will be displayed:

Enter Number of Tx Retries (0-255): 50

ARQ can be set from 0 to 255. It is 50 by default.

(F) Network fail timeout

The Network fail timeout controls the time the system waits when a signal is lost before attempting to

re-synchronise. The NETWORK LINK LED on the front panel also indicates this loss. The default

setting is 5000ms.

To change the Network fail timeout, press (F). The following will be displayed:

Network Fail Timeout value

Must be greater than Online Request timer

Timer value in milliseconds(100-30000): 5000

The value can be set from 100 to 30000 and must be greater than the online request timer. It is 5000 by

default.

(O) Online requests timer

This timer controls the length of time between integrity checks on remote Slaves by the Master. This

setting will affect the carrier detect LED on the front panel for the Master modem as data will only be

returned from the Slave modems at the preset time interval. The default setting is used in a large system

so that RF airtime is not wasted on the Slave to Master link, and the Master is not always tied up

checking for Slave integrity. This setting is also used to keep the system alive when no data is being

passed.