User's Manual

2-11 Installation
DataNex EMS Wireless, DATA-20 Digital Radio
output ON (in tandem with the RF relay) as required for switching. This will increase switching
time and a corresponding increase in data loss during the switchover.
2.9.2 Hot Standby Control using the TP64
2.9.2.1 TP64 Front Panel Controls and Indicators
Note: See the following section for a detailed description of the Master/Slave logic implemented
in the TP64.
DataNex
Figure 2-5. TP64 Front Panel
LED Indicators
Green: The indicated module is active, and that the module is performing within
its specified limits.
Yellow: The indicated module is in standby mode, ready and able for back-up
transfer.
Red: There is a fault with the corresponding module. It is not ready for
backup, and the TP64 will not transfer to that module.
TRANSFER Switches
The RADIO A and RADIO B transfer switches cause the selected radio to become active, and the
Master. See Section 3.4 (following) for further details.
2.9.2.2 Master/Slave Operation & LED Status
The 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.