7705 SAR Interfaces
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Interface Configuration Guide
3HE 11011 AAAC TQZZA Edition: 01
• automatic—allows an MPR-e radio to perform an automatic switchover if a fault
condition exists. An automatic switch operation overrides any manual switch
operation that is in place.
• manual—attempts to switch the main/spare status of an MPR-e radio; however,
if port failures, equipment failures, and reception failures do not allow the
switchover, an automatic switch operation is triggered.
You can also configure revertive switching for RPS and EPS/TPS (when revertive
switching is configured for EPS, it is also applied to TPS; revertive switching for TPS
cannot be configured separately). Revertive switching occurs when the MPR-e radio
operation switches from the spare radio back to the main radio after a fault condition
is cleared.
3.2.17.4 Frequency Synchronization
Depending on the type of Gigabit Ethernet microwave link used to connect the
Packet Microwave Adapter card and an MPR-e radio, different frequency
synchronization mechanisms can be used.
When using optical 1000Base-SX to connect the Packet Microwave Adapter card
and an MPR-e radio, synchronous Ethernet and SSM are the frequency
synchronization mechanisms that are used. SSM is used as the mechanism to detect
a microwave link failure, including loss of frame and MPR-e radio hardware failure.
When using electrical 1000Base-T to connect the Packet Microwave Adapter card
and an MPR-e radio, PCR is the frequency synchronization mechanism that is used
(a copper SFP is mandatory on ports 3 and 4).
For more information on PCR, synchronous Ethernet, and SSM, refer to the
7705 SAR Basic System Configuration Guide, “Node Timing”.
3.2.17.5 RSL History
An MPR-e radio that is connected to the 7705 SAR can automatically upload its
received signal level (RSL) history file to the 7705 SAR host. The RSL file contains
a history of radio attributes and alarms that radio operators can use to isolate and
diagnose radio-layer problems that might exist in the network.
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