ADTRAN 1200270L1, Руководство пользователя

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Chapter 2. Installation
61200270L1-20 DSU III ARdc User Manual 2-7
quence to occur, the DTE must transmit the escape code character three
times in succession with delay between each character being less than the
guard time.
Once the command mode is entered, AT commands can be transmitted to
the DSU III ARdc to configure most of the options or initiate tests to check
both the DSU III ARdc and the network connections. All command lines
must begin with the AT character et in either capital or lower case letters.
The command line may contain a single command or a series of com-
mands after the AT attention code. When a series of commands is used,
the individual commands may be separated with spaces for readability.
The maximum length for a command line is 40 characters. Each command
line is executed by the DSU III ARdc upon receipt of a terminating charac-
ter. The default terminating character is a carriage return (ASCII 013), but
it can be changed by writing a different value to register S3.
Before the terminating character is transmitted, the command line can be
edited by using the backspace character (ASCII 008) to erase errors so the
proper commands can be entered. Valid AT commands for the
DSU III ARdc are listed in AT Commands on page A-1.
V.25 bis Commands
When configured for the V.25 bis option, the DSU III ARdc accepts in-
band dialing and configuration commands from both synchronous and
asynchronous DTE ports.
The V.25 bis option supports the following protocols:
• SDLC (synchronous data link control)
• Bisync
• Asynchronous
SDLC Option
Character Format
• Data bits - 8