Sync V.25 Hdlc Dialing; Sync V.25 Bisync Dialing - ADTRAN Express 3010 Manual

Chapter 3. Application Configuration

SYNC V.25 HDLC Dialing

Although V.25 bis allows asynchronous data format, asynchronous
DTE is more likely to support the AT command set than V.25 bis.
This setting provides V.25 bis messages in bit-synchronous format (for
example, HDLC, SDLC, X.25). The bit-synchronous format is the most
commonly used by V.25 bis.
This option specifies that the characters should be 7-bit ASCII, with
the 8th bit ignored (it may be either 0 or 1).
The first byte of each packet contains all one bits (A = FF HEX), and
the second byte of each packet (the C byte) is either 13 HEX or 03 HEX
if not the final packet.
Select V.25 HDLC flags if your terminal equipment requires idle
state flags.

SYNC V.25 BISYNC Dialing

This setting allows for V.25 bis messages in byte-synchronous format
(BISYNC). V.25 bis specifies that the characters should be ASCII, 7
bits, and odd parity. This setting allows synchronous DTE which does
not use HDLC to support serial in-band dialing.
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