AMT-70/AMT-73/AMT-75 Installation and Operation
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MODEM 'A' 1:1 REDUNDANCY MODEM 'B'
DCE
BUCLNB
DataLAN, etc.
RX
TX
Redundan
RS-530 /
HSSI port
RX
TX
Redundan
RS-530 /
SSI port
RS-530 /
HSSI ports
cy
cy
H
Redundancy
BUC / LNB
TX/RX
interface
125
Figure 61: RS-530 / HSSI redundancy system connection overview
Make data and RF cable connections before connecting the AC power supplies. Connections for RS-
530 and HSSI-based systems are illustrated in
Figure 62 and Figure 63.
When the modems power up, the redundancy may not be active. To do this, use the command
‘redundancy on’ via the RS-232 port, after logging in to each modem. See the modem manual for
guidance on logging in. (Usually, modems supplied with a redundancy kit ship with the redudancy
enabled).
Selection of the ‘active’ or ‘on-line’ path is done automatically by the system. The system is
symmetrical and both modems should be configured with identical parameters. If both modems are
alive and good at simultaneous power-up, the last ‘on-line’ path is usually adopted. If a ‘good’ modem
powers up before the other ‘good’ modem powers up, it will assume the active path immediately.
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General