Limitations/Notes - R&S 4200 Series Operating Manual

R&S XU 4200
3.6.4

Limitations/Notes

6166.5368.02.01
Please note that there are certain limitations for the main/standby operation:
Main and Standby radio configuration with NoGo state on radios wired

as 1:1 M/S pair must be avoided
In case of the NoGo state on both radios, both TEST_OC lines become
open (both radios are reporting a request for M/S switchover). This
state brings the radios to ACTIVE state when they can receive and
transmit simultaneously. This can be dangerous especially for
transmitters.
Example of an incorrect radio configuration:
– HW Configuration: Main and Standby radios are supplied from the
same mains. Both radios are connected to a DC backup battery
– CBIT Configuration: AC-Main Supervision is configured as "NoGo" on
both Main and Stadby radios. If the AC main fails, the radios will
request the M/S switchover and switch to the unwanted ACTIVE state
Note: If one radio is in local mode while the other one is in remote mode,
then the locally operated radio is active and the second one is inactive. This
setting remains even when the local mode is left. The main/standby
switchover capability of the radio pair is now available.
Note: The "Inactive Warning" parameter should be set to "Disable" to avoid
the inactive "Standby" radio showing the CBIT event "INACTIVE
WARNING".
Note: Set the "Line Interface in Local Mode" parameter to "Disable".
Note: Make sure that all operational parameters are equal on both radios
(with exception of IP address).
Main/Standby Operation (1:1)
3.78