Users Manual

MDS 05-6399A01, Rev. G MDS™ Master Station 121
“A” Modem SDx/SDMS
Polling Remote
SCD
9710/SDx
Remote
SCD
9600 8ms
12ms
The following table provides the appropriate PTT values for the various baud formats that are
used with the most commonly used “A” modem in mixed repeater networks, that is, modem
9600.
Baud Polling Remote
and Remote
PTT
96008N1 0ms transmit underflow does not occur because of preamble air time
96008E1 4ms
User Configuration 2: CKEY Repeater Network Case
The configuration required at the remotes in the presence of a CKEY repeater is very similar to
that of when a non-CKEY repeater is used. The only differences are:
- The SCD values required at the remotes should be smaller
- PTT should never be required
“A” Modem SDx/SDMS
Polling Remote
SCD
9710/SDx
Remote
SCD
9600 6ms
8ms
Note: Completely error free performance is not achievable at strong signal because the 9710 takes errors due to a
known 9710 receiver issue.