Single-Base Redundancy Operation - Comtech EF Data MBT-4000 Installation And Operation Manual

Multi-Band Transceiver System
Redundant Configuration
4.2

Single-Base Redundancy Operation

Refer to Figure 4-1 showing a typical single-base redundancy configuration.
Satellite dish
TX /RX
REJECT
FILTER
COMTECHEFDATA
The MBT-4000 base unit monitors health of the two BDCs or two BUCs installed. In case of a
fault on the on-line BxC, the MBT-4000 base will automatically switch over to the standby BxC
according to the following rules:
1. The standby BxC must be of the same type as the on-line BxC.
2. The MBT-4000 must be set to redundancy mode 1, the RED=1 command must have been
received by the base.
3. Both BxCs must be set to automatic mode, the commands RAM=11 and RAM=21 must
have been received by the base.
4. The standby BxC must not be in faulted state.
5. When BxC UNIT 1 is on-line, both the RF and IF switches will be switched to
position A. When BxC UNIT 2 is on-line, the switches will be switched to position B.
AUX COMM 1
CA/3722-2
LNA 1
CA/3722-2
LNA 2
J10
RF SWITCH
AUX COMM 2
Figure 4-1. Single-Base Redundancy Operation
J2 J3
J9
BDC 1 (UNIT 1)
1:1 MBT SUBSYSTEM
BDC 1 (UNIT 2)
J8 J7 J6 J5
4-2
Revision 3
MN/MBT4000.IOM
PC
LOAD
RX
L-BAND
MODEM
IF SWITCH
SINGLE MBT-4000 REDUNDANT SWITCH
TX