User's Manual

Doc. No.
Rev.
Date
DRAFT
1.01
2012-01-27
Damm Cellular Systems A/S, Denmark
TetraFlex
®
7.5 Manual - BS421 Configuration
TetraFlex® 7.5 Manual 2-75
If no GPS synchronized Master or higher prioritized free-running Master is available at re-
start, Masters will try initially to synchronize to lower prioritized free-running Masters.
A BS will resync automatically after a short time if Century Second and Phase Detector are
out of sync with a valid sync source.
Masters shall be setup even if GPS antennas are not used and internal GPS RX is
deselected, to ensure proper synchronization between all TR's.
Typical 1-carrier BS421 configuration:
 TR11: Master 1
OM command: 72/MASTER/1
Typical 2-carrier BS421 configuration with GPS on both carriers:
 TR11: Master 1
 TR12: Master 2
 TR11-OUT connected to TR12-IN1
 TR12-OUT connected to TR11-IN1
OM command:
TR11
72/MASTER/1
72/IN/G/+
72/IN/1/+
72/IN/1/-/172.016.001.012/000.0
72/OUT/172.016.001.012/+
TR12
72/MASTER/2
72/IN/G/+
72/IN/1/+
72/IN/1/-/172.016.001.011/000.0
72/OUT/172.016.001.011/+
Typical 3 or 4-carrier BS421 configuration:
 TR11: Master 1 (Powered of SB421-1)
 TR12: Slave (Powered of SB421-1)
 TR13: Master 2 (Powered of SB421-2)
 TR14: Slave (Powered of SB421-2)
 TR11-OUT connected to TR12-IN1, TR13-IN1 and TR14-IN1
 TR13-OUT connected to TR11-IN1, TR12-IN2 and TR14-IN2
Interconnection board 1 second pulse sync indicators flashes synchronous when in
sync