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CDM-740 Advanced Satellite Modem
1:1 Redundancy
o The GE1 and GE2 Gigabit Ethernet data interfaces on the failed primary modem
•
Upon restoration of the primary modem, the backup modem remains online until a
manual switch to primary is performed (non-revertive).
C.3
CDM-740 1:1 Redundancy Setup
In order to avoid damage to the CDM-740 modems and the CRS-175L switch, it is
important for the user to follow this sequence of configuration:
•
IMPORTANT
•
•
Refer to Chapter 2. INSTALLATION and Chapter 3. MODEM AND SWITCH
CONFIGURATION in the CRS-175L L-Band 1:1 Redundancy Switch Installation and
Operation Manual (Comtech EF Data Document Number MN-CRS175) for further information on
these procedures.
C.3.1
User (IF)
Refer to Chapter 4. CABLES AND CONNECTIONS and Appendix A. CABLE DRAWINGS
in the CRS-175L L-Band 1:1 Redundancy Switch Installation and Operation Manual (Comtech
EF Data Document Number MN-CRS175) for complete cabling information.
The user should ensure that:
•
IF cabling has been connected between the user's IF Rx/Tx signal sources and the
CRS-175L "Antenna Side" connectors;
•
IF cabling has been connected between the CRS-175 IF Rx/Tx "Modem Side" connectors
and the primary and backup Modems;
•
Control cabling has been connected between the CRS-175L and the primary and backup
modems;
•
User-provided Data Interface Cabling and Switches have been connected between the
primary and backup modems and the user's data interface.
are disabled and the GE1 and GE2 Gigabit Ethernet data interfaces on the backup
modem will be enabled.
gratuitous ARP responses on both Gigabit Ethernet interfaces to inform the
downstream LAN devices of the new associations between both Gigabit Ethernet
interface's IP addresses and the backup modem's MAC addresses. The IP
addresses will be the same IP addresses that existed on the primary modem, but
the MAC addresses will be unique to the backup modem.
First, ensure that the CDM-740 Satellite Modems have been properly set up
with the CRS-175 switch for 1:1 redundant operation. All cables should be
connected between the (powered OFF) modems and the CRS-175L.
Second, once the modems and switch have been properly cabled for 1:1
redundant operation, the user should then set the DIP switches on the
CRS-175L to the correct operational selection.
Third, once the modem and switches have been properly set up and the
switch configured for proper operation, the user can then power ON the
modems.
CRS-175L
CDM-740
Once this occurs, the backup modem sends out
User (Data Interface) Cabling
C–3
Revision 0
MN-CDM740
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