Comtech EF Data SDM-650B Spécifications télécharger pdf (Page 289)

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11–1

Chapter 11. ASYNCHRONOUS

INTERFACE/AUPC

11.1 Asynchronous Interface/AUPC

The asynchronous (ASYNC) interface option provides the interface for terrestrial data

and a single ASYNC overhead channel. Typically used for earth-station-to-earth-station

communication, the overhead channel is MUXed onto the data and transmitted at an

overhead rate of 16/15 of the main channel. The AUPC feature works with the ASYNC

option to allow remote communication between a local modem and a remote modem.

Refer to Figure 11-1 for a modem block diagram with the ASYNC/AUPC interface

option.

G.703, EIA-422, or V.35 interfaces are available for terrestrial data input and output.

These interfaces can be selected via the front panel.

EIA-485 or EIA-232 interfaces are available for ASYNC channel input and output. These

interfaces can also be selected from the front panel. Fixed 1/15 overhead is added to the

data when an ASYNC channel is being used. With the ASYNC channel enabled, the

terrestrial data rate can be from 8 to 2048 kbps. The ASYNC channel I/O protocol can be

as follows:

Baud 110 to 38400

Data Bits 5 to 8

Parity odd, even, or none

Stop Bits 1 or 2

Note: Certain combinations of baud rate, data rate, parity, and stop bits will limit the

maximum baud rate allowed for continuous throughput based on terrestrial data rate.

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