Moseley Starlink SL9003Q, User Manual, Page: 134 / 141

F-14 Appendix F: Redundant Backup with TP64 and TPT-2 Transfer Panels
Moseley SL9003Q 602-12016-01 Revision J
The “RADIO A” and “RADIO B” transfer switches cause the selected radio to become active
and the Master. See the following section for further details.
F.5.3 Master/Slave Operation & LED Status
The TP128/TP64 operates in a Master/Slave logic mode. In the power up condition, the
Master is “RADIO A”. This means that “RADIO A” is the default active unit. The following
logic applies to hot or cold standby, external or internal duplexer configurations.
Table F-1. TP128/TP64 Transmitter Master/Slave Logic
Selected Master TXA Status TXB Status TXA LED TXB LED Active TX TX Relay Position
A OK OK GRN YEL A A
A OK FAIL GRN RED A A
A FAIL OK RED GRN B B
A-Master Logic
A FAIL FAIL RED RED N/A A
B OK OK YEL GRN B B
B OK FAIL GRN RED A A
B FAIL OK RED GRN B B
B-Master Logic
B FAIL FAIL RED RED N/A B
Table F-2. TP128/TP64 Receiver Master/Slave Logic
Selected Master RXA Status RXB Status RXA LED RXB LED Active RX RX Data & Clk
A OK OK GRN YEL A A
A OK FAIL GRN RED A A
A FAIL OK RED GRN B B
A-Master Logic
A FAIL FAIL RED RED N/A None
B OK OK YEL GRN B B
B OK FAIL GRN RED A A
B FAIL OK RED GRN B B
B-Master Logic
B FAIL FAIL RED RED N/A None
A-Master Logic (default power-up) : If RADIO A is “good”, the Tp128/TP64 will remain in
RADIO A position regardless of RADIO B’s status. If RADIO A fails, the TP128/TP64 will
switch to RADIO B (assuming that RADIO B is “good”). If RADIO A returns to a “good”
condition, the TP128/TP64 will switch back to RADIO A (the default Master)
Manual Switchover to B-Master Logic : The front panel switch on the TP128/TP64 can be
used to manually force the system to a new Master. By pressing the RADIO B button,
RADIO B now becomes the Master, and the TP128/TP64 will switchover to RADIO B
(assuming that RADIO B is “good”). The default A-Master Logic will then switch to B-Master
Logic as outlined in Tables F-1 and F-2.
NOTE : Manual switching of the Master is often used to force the system over to the
standby unit. You may want to put more “time” on the standby unit after an extended
period of service.
In Hot Standby configurations, this will not improve reliability. In a Cold Standby, the “burn
time” is more significant, since the RF power amplifier device operating life becomes a
factor.