Technical data

You can use the AT&F[<profile>] and ATZ[<profile>] commands to select a TTY profile.

Supported TTY profiles

Profile Description

14 Autodetection of B-channel protocol. See Incoming RAS call type autodetection on page 69 for

details.

1 X.75/Transparent/Transparent protocol stack. Data compression in accordance with V.42bis is

detected automatically for incoming calls.

2 V.110 synchronous mode.

3 V.110 asynchronous mode.

4 Synchronous modem with V.42/V.42bis.

5 Asynchronous modem (up to V.90) with full negotiation and V.42/V.42bis/MNP.

6 V.120, 64 kbps, V.42bis compression auto-detection for incoming connections

7 V.120, 56 kbps, V.42bis compression auto-detection for incoming connections

8 Bit-transparent access to B-channel data [a]

9 HDLC/Transparent/Transparent protocol stack that is widely used for PPP connections [b].

10 Same as profile 9, but with 56000 bps

11 BTX

12 BTX

15 X.75 with data compression in accordance with V.42bis. This profile should be used for outgoing calls

if you wish to use data compression in accordance with V.42bis. If the opposite side does not support

data compression, the connection will be established without data compression.

16 PIAFS 1.0 32 kbps [c]

17 PIAFS 2.0 64 kbps [c]

18 PIAFS 2.1 32/64 kbps [c]

Notes:

[a] By default, this profile does not switch to data mode after the connection was established.

[b] This profile switches to numeric mode (ATV0) and "echo off" (ATE0) by default.

[c] You can use the AT+iE command to activate the CHINA PIAFS protocol extension.

Supported TTY profiles