Dual-Base (Chain) Redundancy Operation; Figure 4-2. Dual-Base (Chain) Redundancy Operation - Comtech EF Data MBT-4000 Installation And Operation Manual

Multi-Band Transceiver System
Redundant Configuration
4.3 Dual Base (Chain) Redundancy Operation
Refer to Figure 4-2 of typical Dual Base (Chain) Redundancy configuration.
RF SWITCHES
SHOWN IN
POSITION
B
TX
REJECT
FILTER
WAVEGUIDE
RX
REJECT
LOAD
FILTER
WAVEGUIDE
SWITCH 1 RF
COMTECHEFDATA
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 on-line BxC the MBT-4000 base containing the corresponding
standby BxC, will automatically switch over to the standby BxC according to 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 (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.
AUX COMM 2
LNA 2
LNA 1
J10
SWITCH 2 RF
AUX COMM 2
AUX COMM 1
SSPA 2
SSPA 1
J10
AUX COMM 1
Figure 4-2. Dual Base (Chain) Redundancy Operation
UNIT 2
COMM
J6
J8
BDC 2 (Slot 2)
1:1 MBT SUBSYSTEM
BUC 2 (Slot 1)
J9 J7 J3
UNIT 1
COMM
REDUNDANCY
INTERLINK CABLE
UNIT 2
J6 COMM
J8 J7
BDC 1 (Slot 2)
1:1 MBT SUBSYSTEM
BUC 1 (Slot 1)
J9 J3
UNIT 1
COMM
4-3
MN/MBT4000.IOM
LOAD
J5
SWITCH 2 IF
LOAD
J5 SWITCH 1 IF
DUAL MBT-4000 REDUNDANT SWITCH
Revision 3
RX
L-BAND
MODEM
TX