Interface Configuration Guide 7705 SAR Interfaces
Edition: 01 3HE 11011 AAAC TQZZA 147
• an MWA Gigabit Ethernet link failure between the 7705 SAR-8 or 7705 SAR-18
and an MPR-e radio
• a Packet Microwave Adapter card connected to an active EPS MPR-e going into
a missing or failure state
1+1 Transmission Protection Switching (TPS)
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 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.
1+1 Radio Protection Switching (RPS)
RPS is a hitless radio function that provides space diversity protection for the
microwave channel. On the receive side, each MPR-e radio monitors the same radio
frequency channel, with the main MPR-e radio being the active receiver by default.
Both active and standby RPS MPR-e radios receive both streams of radio frames.
The standby RPS MPR-e radio sends the stream of radio frames that it receives to
the active EPS MPR-e radio.
Note:
• 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.
Note: In order to provide space diversity (SD) for the two radio frequency channels, RPS
requires that a separate antenna be mounted for each MPR-e radio.
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