In a 1+1 HSB configuration, TPS protects against a microwave link transmission failure by ensuring that only one MPR-e radio at a time uses the antenna for signaling. The 7705 SAR-8 Shelf V2 or 7705 SAR-18 sends traffic to both the active and standby TPS MPR-e radios. Upon receiving the baseband traffic, both radios modulate it and up-convert it to signals. However, only the active TPS MPR-e radio transmits the RF signals; the standby TPS MPR-e radio suppresses the signals. When the active TPS MPR-e radio fails, standby radio becomes active and restores the microwave link channel.
The switching criteria for TPS are identical to EPS.
The state of the EPS and TPS MPR-e radios are linked to each other. If an alarm occurs, an automatic switchover for EPS and TPS is activated simultaneously. However, if a manual switchover is configured, the switchover is decoupled and the state of the EPS and TPS MPR-e radios is no longer identical.
A manual switchover can be configured for EPS but not for TPS.