Interface Configuration Guide 7705 SAR Interfaces
Edition: 01 3HE 11011 AAAC TQZZA 145
MPR-e Radio Mute Control
MPR-e radio mute control can be enabled through the CLI/SNMP or by using the
MCT. The MCT and CLI are synchronized to show the current state of the MPR-e
radio mute function.
3.2.17.3.2 Microwave Link Fast Fault Detection (FFD)
The microwave link Fast Fault Detection (FFD) capability allows a 7705 SAR-8 or
7705 SAR-18 to directly detect MPR-e radio or microwave link faults using
proprietary messaging. The following fault types are detected by FFD:
• a radio signal failure
• an MPR-e radio hardware failure
• an incompatible MPR-e radio setting
• a High Bit Error Rate (HBER) condition
• a Remote Defect Indication (RDI) condition
If microwave link faults are detected, an event is logged and the link is disabled.
Some detected faults may be selectively suppressed using the suppress-faults
command. When faults are suppressed, the event is still logged, but the microwave
link is not disabled. Operators can suppress HBER faults, RSL threshold crossing
faults, and/or RDI faults. By default, the system does not suppress faults for FFD.
Note: Administratively disabling the microwave link with which the MPR-e radio is
associated (using the config>port>mw-link-id>shutdown command) causes the main
and spare MPR-e radios to be muted.
Note:
• FFD does not cause the SSU to disqualify the microwave link as a clock source if a
fault condition is detected; SSM must be enabled in order to provide this function.
• The microwave link hold time (hold-up time and hold-down time) must be configured in
order to suppress link flapping. The hold-up and hold-down times delay advertising the
transition of the microwave link status to the upper layer applications, including
IP/MPLS and SSU. The hold-time range is between 0 and 900 s.
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