Comtech EF Data CDM-700 Especificações descarregar pdf (Página 140)

CRS-300 1:10 Redundancy Switch Revision 16

Cables and Connections MN/CRS300.IOM

4–80

4.11 IF Cable Connections

There are two different possible IF configurations: single transponder and multiple transponders.

For a single transponder, all the modems are connected to the same user Up/Downconverter.

For multiple transponders, the modems may be grouped and connected in various

combinations to multiple up/down converters. The CRS-280 (70/140 MHz) IF Switch is

required for multiple transponder operation.

If using the CRS-280L (L-Band) IF Switch, additional installation information can be

found in the

CRS-280L Installation and Operation Manual.

Proceed with the transponder configuration method applicable to your system.

4.11.1 IF Cable Connections – Single Transponder (without CRS-280/280L)

IMPOR TANT

To prevent problems resulting from impedance mismatch, ensure that the

impedance for the modem’s cables and combiner are the same.

Referring to Figure 4-36 (L-Band operation shown):

For single transponder IF configurations, connect the user-provided IF cables as follows:

► For Transmit (Tx) IF Connections:

•

Connect the appropriate user-provided IF cables from each modem’s “Tx IF” connector

(BNC for 70/140 MHz, Type ‘N’ for L-Band) to a single user-provided power combiner.

• Connect the output of the power combiner to the user Upconverter.

► For Receive (Rx) IF Connections:

•

Connect the appropriate user-provided cables from each modem’s “Rx IF” connector

(BNC for 70/140 MHz, Type ‘N’ for L-Band) to the output ports of a single user-

provided splitter.

• Connect the input of the splitter to the output of the user Downconverter.

When a modem is taken offline, its Tx IF is automatically muted (shut down) by the CRS-300.

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Comtech EF Data CDM-700 Especificações Página 140