Multi-Tech Systems MT5600SMI-L34, MT5600SMI-XL34 manual Examples, AT-STE=7, Line-In-Use, Connect

Chapter 5 – AT Commands, S-Registers, and Result Codes

Case 2: Telephone Line is in Use but Disconnected

If an ATDT, ATDP or ATDL is issued while Line-In-Use detection is enabled and the telephone line is NOT in use, the modem will go off- hook after a short pause, then respond with CONNECT or NO CARRIER message.

Case 3: Telephone Line is not Connected to Modem

If an ATDT, ATDP, or ATDL is issued while Line-In-Use detection is enabled and the telephone line is not connected, the modem will go off- hook momentarily, go back on-hook, and then respond with NO DIAL TONE message.

Extension Pick-up

(Enabled by AT-STE=2, AT-STE=3, AT-STE=6, or AT-STE=7):

Case 1: Modem off-hook, Local Handset Goes Off-Hook

If the local handset goes off-hook while the modem is in a data connection, the local handset will be muted. The modem will then send a GSTN Cleardown to the remote modem and then go on-hook. The modem will then send a NO CARRIER message to the DTE. A result code of 25 will be left in S86 register. After 2 seconds, the local handset will be connected to the telephone line so the user hears the dial tone.

Remote Hang-up

(Enabled by AT-STE=4, AT-STE=5, AT-STE=6, or AT-STE=7):

Case 1: Modem off-hook, Remote Hang-up

If the modem is connected (off-hook) and the remote modem/server goes hangs up, the central office may issue a line polarity reversal. If a line polarity reversal is detected, the modem will drop the call and respond with NO CARRIER. The reason for hang-up can be determined by #UD or by S86=25. A line reversal can also be simulated by simply pulling out the telephone line during a connection.

Operation in Voice Mode

Line-In-Use

(Enabled by AT-STE=1, AT-STE=3, AT-STE=5, or AT-STE=7):

This feature does not apply in voice mode.

Extension Pickup

(Enabled by AT-STE=2, AT-STE=3, AT-STE=6, or AT-STE=7)

If the modem is off-hook and an extension goes off-hook, the modem issues a <DLE>P to the DTE. The application software should then hang up the line (VLS=0).

Remote Hang-up (EnabledbyAT-STE=4,AT-STE=5,AT-STE=6,orAT-STE=7)

If the modem is off-hook and the remote user goes on-hook, the modem issues a <DLE>P to the DTE. The application software should then hang up the line (VLS=0).

Examples:

User is talking on an extension and the modem tries to dial

AT-STE=7

ATDT555-1212

LINE-IN-USE.

The line is not in use and the modem tries to dial

AT-STE=7

ATDT555-1212

Modem goes off-hook

CONNECT

Multi-Tech Systems, Inc. SocketModem MT5600SMI Developer’s Guide 49