Nokia 7705 SAR - Page 148

7705 SAR Interfaces
148
Interface Configuration Guide
3HE 11011 AAAC TQZZA Edition: 01
Figure 16 shows a typical application of 1+1 HSB with SD deployment. Only one
microwave frequency channel is active and only the main MPR-e radio is transmitting
data to the remote ends; the spare MPR-e radio is acting as a standby.
Figure 16 1+1 HSB with SD Deployment
1+1 HSB Transmit Diversity Antenna (TDA)
The TDA feature provides another layer of protection over a microwave link. The
TDA configuration uses a main antenna mounted on one MPT-HLC radio and a
diversity antenna mounted on another MPT-HLC radio. In combination with the 1+1
HSB radio configuration (redundant MPR-e radios), the traffic is transmitted on either
the main antenna or the diversity antenna to achieve the Space Diversity (SD)
receiver configuration.
TDA provides protection switching independent of TPS. TDA is capable of
counter-acting either negative propagation conditions or permanent antenna failure.
The main antenna is the default main unit that controls the antenna traffic flow using
the TDA algorithm. If the main unit fails, the TDA algorithm is no longer operational
on the main unit; its transmission switches over to the diversity antenna.
The non-operation of the main antenna switch does not affect transmission, even
while the TDA algorithm is being transmitted on the diversity antenna.
TDA configuration is done via the MCT. TDA status is available using the 7705 SAR
CLI/SNMP and via the MCT. The CLI command that is used is show>mw>link. The
status information includes the current TDA configuration, which antenna is active,
and the active antenna position.
Figure 17 shows an example of a TDA application.
7705 SAR-8
MPR-e-Active MPR-e-Active
MPR-e-StandbyMPR-e-Standby
Traffic
PW1
PW1
PW1
PW1 PW1
PW1
PW1
22043
F1
7705 SAR-8