Comtech EF Data SDM-650B Spezifikationen PDF herunterladen (Seite 295)

100

101

SDM-300L3 Satellite Modem Revision 0

Asynchronous Interface/AUPC MN/SDM300L3.IOM

11–7

Notes:

1. Comtech EF Data does not recommend increasing the power to the satellite

without consulting with the satellite controller.

2. Be careful not to set carrier output too high when there is a loss of carrier due to

severe weather and the CL loss action is set to Maximum.

3. Do not use the distant end RX signal to compensate for local rain fade unless

allowances are made for a narrow window for TX level changes.

11.3 ASYNC

The modem supports terrestrial data interfaces and the ASYNC Overhead interfaces.

11.3.1 Terrestrial Data Interfaces

Two I/O interfaces are provided for the terrestrial data source: EIA-422 and V.35. The

operator must select the terrestrial interface type from the front panel under the Utility

Interface menu. Once selected, I/O data is routed to and from the appropriate drivers and

receivers.

11.3.2 ASYNC Data Interfaces

The EIA-485 and EIA-232 I/O interfaces are provided for the ASYNC data source. The

operator must select the ASYNC data interface type from the front panel under the Utility

Interface menu. Once selected, the I/O data is routed to and from the appropriate drivers

and receivers.

EIA-485 (2-wire) requires connecting the TX + and RX + as one wire and tying TX and

RX for the second wire at the Data I/O/ This connection is not facilitated inside the

modem with relays.

Example:

BOP MODEM

50-PIN

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