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MBT-4000 Multi-Band Transceiver System
Redundancy Configuration / Operation
C.3
Dual-Base (Chain) Redundancy Operation
RF SWITCHES
SHOWN IN
POSITION
B
TX
REJECT
FILTER
WAVEGUIDE
RX
REJECT
FILTER
WAVEGUIDE
Figure C-1 illustrates a typical Dual-Base (Chain) Redundancy configuration. The two
MBT-4000 base units cooperate in monitoring the health of the four BxCs (and each other). In
case of a fault on an online BxC the MBT-4000 base containing the corresponding standby BxC,
will automatically switch over to the standby BxC in accordance with the following rules:
1. In dual-base (chain) redundancy operation, the redundancy is 'slot' based. The
corresponding pairs reside in the same 'slot' of the opposite MBT-4000 base, the pair of
BxCs connected to J3 UNIT 1 COMM (Slot 1) on each base form a redundant pair. The
BxCs connected to J6 UNIT 2 COMM (Slot 2) on each base form the other redundant
pair. Typically, one pair is used for up conversion and the other for down.
2. The corresponding BxCs in a pair must be of the same type.
3. The Redundancy Interlink Cable (CEFD P/N CA/WR11224-1 or equivalent) must be
installed.
4. Base unit identification(MBT-A or MBT-B) is driven by the redundancy interlink cable.
Hard wired connections within the cable designate one MBT-4000 base as MBT-A and
the other as MBT-B. The cable is labeled accordingly.
5. The RF and IF switches connected to MBT-A correspond to the redundant pair of BxCs
installed on J3 UNIT 1 COMM (Slot 1).
AUX COMM 2
LNA 2
LNA 1
SWITCH 2 RF
AUX COMM 2
AUX COMM 1
SSPA 2
LOAD
SSPA 1
SWITCH 1 RF
Figure C-1. Dual-Base (Chain) Redundancy Operation
J8
J6
BDC 2 (Slot 2)
1:1 MBT SUBSYSTEM
BUC 2 (Slot 1)
J10
J9
J7
J3
UNIT 1
COMM
REDUNDANCY
INTERLINK CABLE
UNIT 2
J6
COMM
J7
J8
BDC 1 (Slot 2)
1:1 MBT SUBSYSTEM
BUC 1 (Slot 1)
J10
J9
J3
UNIT 1
COMM
AUX COMM 1
C–2
MN/MBT4000.IOM
UNIT 2
COMM
LOAD
J5
SWITCH 2 IF
LOAD
SWITCH 1 IF
J5
Revision 4
RX
L-BAND
MODEM
TX
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