MBT-4000B Multi-Band Transceiver System
Revision 1
Appendix B
MN/MBT4000B.IOM
B–3
Figure B-1
illustrates a typical Dual-Base (Chain) Redundancy configuration. The two MBT-4000B
base units cooperate in monitoring the health of the two BUCs, two external amplifiers, two
Low-Noise Block Down Converters (LNBs), and each other. In case of a fault on an online
BUC/amplifier or LNB, the MBT-4000B base containing the corresponding standby chain will
automatically switch over to the standby chain 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-4000B base, the pair
of BUCs connected to the
“J3 | UNIT 1 COMM”
(Slot 1) connector on each base form a
redundant pair. The LNBs connected to the
“J12 | L-BAND IN”
connector on each base
form the other redundant pair.
2.
The corresponding BUCs in a pair must be of the same band type.
3.
The Redundancy Interlink Cable (CEFD P/N CA/WR11224-1 or equivalent) must be
installed.
4.
Base unit identification (
MBT1
or
MBT2
) is driven by the redundancy interlink cable.
Hard-wired connections within the cable designate one MBT-4000B base as
MBT1
and
the other as
MBT2
. The cable is labeled accordingly.
5.
The RF and IF switches connected to
MBT1
correspond to the redundant pair of BUCs
installed on the
“J3 | UNIT 1 COMM”
(Slot 1) connector.
6.
The RF and IF switches connected to
MBT2
correspond to the redundant pair of LNBs
installed on the
“J12 | L-BAND IN”
connectors.
7.
When a BUC or LNB attached to
MBT1
is online, the corresponding RF and IF switches
will be switched to Position
“
A
”
. When a BUC or LNB attached to
MBT2
is online, the
corresponding switches will be switched to Position
“
B
”
.
For a switchover to occur:
1.
Both MBT-4000B base units must be set to Redundancy Mode 2. The
RED=2
remote
command must have been received by each base.
2.
Both chains must be set to Automatic Mode. For example, if the redundant pair is on
Slot 2 of the bases, the
RAM=21
remote command must have been received by each
base.
3.
The corresponding standby chain must not be in faulted state.
Summary of Contents for MBT-4000B
Page 14: ...MBT 4000B Multi Band Transceiver System Revision 1 Preface MN MBT4000B IOM xiv Notes...
Page 20: ...MBT 4000 Multi Band Transceiver System Revision 1 Introduction MN MBT4000B IOM 1 6 Notes...
Page 84: ...MBT 4000B Multi Band Transceiver System Revision 1 Appendix B MN MBT4000B IOM B 8 Notes...
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