Multi Tech Equipment MTA128ST manual Dialing Numbers, COM Port Settings

Configuration Utility

V.120 Protocol—Similar to V.1 10 protocol, but provides rates up to 64000 bps on each B channel.

X.75 Protocol—Packet-switched network protocol for international use. Layer 2 portion of this protocol is used commonly as a rate adaption protocol.

MLPPP Protocol—MLPPP (Multi-Link PPP) protocol provides rates up to 64 Kbps per channel. This protocol uses both B channels at once, providing an aggregate data transmission speed of 128 Kbps.

Dialing Numbers_______________________________

The MTA1 28ST/NT can dial telephone number n, where n can be up to 20 characters.

AT command: Dn (n = phone number).

Stored Numbers _______________________________

The MTA128ST/NT can store as many as ten phone numbers, up to 20 characters each. AT command: &Z=

Dialing Stored Numbers ________________________

The MTA1 28ST/NT can dial a number previously stored in directory number n with the &Zn=x command.

AT command: e.g., DS3

COM Port Settings

COM port settings control how your TA communicates with your computer through the RS232/V.24 serial port.

Select the initial speed at which your TA communicates with your computer. For V.110 data protocol, the

Baud Rate or Bit Rate___________________________

rates must be identical on the localand remote TAs and may not exceed 38400 bps. For all other data protocols (V. 120, MLPPP, X.75, etc.), the default initial baud rate is 115200 bps. Typically, in command mode, the MTA1 28ST/NT selects a serial port speed of 300, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200, or 230400 bps depending on how fast the AT commands are coming from the computer or terminal. The $SBn command sets the default serial speed used when the TA first powers up. Using the %S command you can disable automatic speed selection and lock the serial port speed to 460800 bps. See Serial Port Configuration Commands in Chapter 4 for more information.

AT commands: $SB or %S

Note: Your computer must have a high speed serial port with a 16550AFN UART, or equivalent, to utilize ISDN’s high speeds.

Flow Control __________________________________

Select the method by which your TA and computer control the flow of data between them. Unless you know your computer has special requirements, select the default RTS/CTS method. The other choice is XON/XOFF.

AT command: &E

Data Bits, Parity, and Stop Bits ___________________

These settings further control initial communications between the TA and computer. Unless you know your computer has special requirements, use the default settings of 8 data bits, no parity checking, and 1 stop bit (8-N-1). The TA sets these parameters automatically the first time it receives an AT command from the computer.

AT commands: @P4=, @P3=, @P6=

DTR Detect Time _______________________________

Sets the time, in 0.1-second increments, that DTR must remain low before the TA disconnects. The default value is 0.5 second; however, you can set it anywhere within the range 0–255

(0.05–25.5 seconds).

AT command: S25=

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