ADTRAN DSU IV ESP, User Manual

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Chapter 5. Configuration Overview
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V.25 Bis Commands
When configured for the V.25 bis option, the DSU IV ESP accepts
in-band dialing and configuration commands from both
synchronous and asynchronous DTE ports.
The V.25 bis option supports the following protocols:
• SDLC
• Bi-Sync
• Asynchronous
SDLC Option
Character Format
• Data bits - 8
• Parity bit - Ignored
Command Structure
[F][A][C][V.25 bis COMMAND][FCS][F]
The address field [A] is FFH. The control field [C] is set to 13H
except for cases of multi-frame responses. For this case, the control
field is set to 03H in all but the last frame. The 03H in the control
field indicates that other frames are to follow while the 13H in the
control field indicates the final frame.
Bi-Sync Option
Character Format
• Data bits - 7
• Parity bit - Odd
Command Structure
[SYN][SYN][STX][V.25 bis COMMAND][ETX]