Advantech AMT-70, Installation And Operation Manual, Page: 122 / 160

AMT-70/AMT-73/AMT-75 Installation and Operation
CHAPTER 11 REDUNDANCY
The AMT-70 modem can be purchased with additional functionality that facilitates a one-for-one (1:1)
redundancy system. The redundancy feature is installed at manufacturing of the modem. This section
describes how to set up your hardware and configure the redundancy system to best suit your needs.
11.1 Hardware Installation
Your AMT-70 Redundancy kit is one of two variants: ASI (Asynchronous Serial Interface) or
combination RS-530 and HSSI (High Speed Serial Interface). The ASI kit ships with a redundnacy
bracket to be fitted near the rear of the modems, detailed in section
11.1.1
. The RS-530/HSSI kit
ships with a larger 1U chassis to be fitted ideally below or between the 1:1 modem chassis. This is
detailed in section
11.1.2
.
If you have the HSSI / RS-530 kit, skip to section 11.1.2.
11.1.1
ASI Interface
The redundancy hardware kit consists of the following:
Rack-mount bracket with RF splitter and switch pre-mounted;
2 x N-Type-to-SMA Cables (P/N 26A-200ABC-001 and 26A-200ABC-201)
2 x BNC-to-BNC Cables (P/N 26A-200ABC-001 and 26A-200ABC-101)
Wire harness assembly (P/N 26A-200ABC-301)
The two AMT-70 chassis should be placed into a rack mount. The rack-mount bracket is mounted
ideally between the two chassis at the rear of the modem. You may find it best to leave a 1-2U shelf
gap (but no more) between the modems in order to accommodate the rack mount bracket easily with
the units.
The entire system is illustrated in
Figure 60
. Note that the gap between the units is greatly
exaggerated in order to present the connections in a clearer manner.
The DATA (ASI) input is ‘split’ to the 2 units. Using the 2 BNC-to-BNC cables (P/N 26A-200ABC-001
and 26A-200ABC-101) connect from positions 1 and 2 on the splitter to the ASI ports (P7) on each unit.
One of the cables is longer, providing for the bracket to be closer to one of the units than the other if
necessary.
The Wire harness assembly (P/N 26A-200ABC-301) has two DB-15 connectors and is usually pre-
wired to the RF switch. If this is not the case, consult Chapter 5 for wiring details. Connect DB-15
ends to the P4 interfaces on each chassis.
The Wire harness assembly is hard-coded, meaning one end of the DB-15 associates with one ‘active
path’ on the RF switch and only this path.
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The DB-15s have been marked ‘A’ and ‘B’, meaning that the unit connected to the ‘A’ end will be on the
‘1’ path for the RF switch, and ‘B’ on the ‘2’ path. The RF switch is labeled 1—C—2. Using the N-to-
SMA cables (P/N 26A-200ABC-001 and 26A-200ABC-201), connect chassis ‘A’ to position ‘1’ on the
switch and chassis ‘B’ to position ‘2’.