Product specifications

CDM-710 Broadcast Satellite Modem Revision 10
Introduction MN/CDM710.IOM
1.2.2 Verification
The unit includes a number of tests for rapid verification of the correct functioning of the unit.
Selection of a CW carrier permits measurement of carrier center frequency or phase noise
characteristic. A single-sideband carrier also is available at the operating symbol rate to check I
and Q phase and amplitude balance. When normal operation is again selected, all of the previous
values are restored.
1.2.3 Allowable Data Interface Combinations
Data interfaces are installed or removed from the rear of the chassis into Slot 1 and Slot 2 of the
modem. The allowable combination of data interfaces and the data interfaces that are supported for
redundancy are found in the table below. In all cases, only one data interface is active at a time.
Additional information relating to the data interfaces supported in 1:1 and 1:N support is also
provided.
1:1 Redundancy with the CRS-170A (70/140 MHz) and CRS-180 (L-Band): The “Allowable
CDM-710 Modem Configuration” column in the table that follows shows the data interface
combinations of the modem that are supported by the CRS-170A and CRS-180 1:1 Redundancy
Switches. First, the 1:1 switch is selected depending upon the operating frequency, and then a
data interface kit for Slot 1 and Slot 2 is chosen. More information on these kits is provided in the
CRS-170A or CRS-180 1:1 Redundancy Switch datasheet and Installation and Operation manual.
1:N Redundancy with the CRS-300: The CRS-300 was originally designed for operation with the
CDM-600 and subsequently adapted to a number of other modems. It is capable of supporting
interfaces up to the point where there are no more paths left to route traffic. This is the reason why
the CRS-300 supports a limited set of the interface combinations supported by the CDM-710.
CDM-710 Modem Configuration 1:N CRS-300 Configuration
Notes
Interface Slot 1 Interface Slot 2 TMI Card RMI Card
ASI (CDI-40) None
CRS-325 CRS-306
-
ASI (CDI-40)
GbE (CDI-70)
Can be used as
Redundant Modem
HSSI (CDI-60)
None
CRS-336
-
None
GbE (CDI-70) CRS-306 -
HSSI (CDI-60)
GbE (CDI-70)
Can be used as
Redundant Modem
Notes:
1. The Redundant Modem must have the same interface cards in each slot as any of the
Traffic Modems.
2. The Traffic Modem must have the same interface cards in each slot as any of the other
Traffic Modems have, or a blank panel installed.
3. Interface Slots 1 and 2 are not active simultaneously
.
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