Multi-Tech Systems ISIHP-4U, ISIHP-4SD manual S0=

Software/Driver Installation

•Persistent DTR Dialing __________________

A high DTR (Data Terminal Ready) signal on the serial port indicates that your computer or terminal is ready to communicate with your TA. DTR normally goes high when a communication program starts or is ready to dial. Persistent DTR dialing enables the TA to automatically redial the number stored in memory location 0 whenever DTR is high, and the serial port does not have an active call. You can enable or disable this feature. AT command: $D

• Auto Answer Data Calls _________ Rings to Answer _________

Select Auto Answer if you want the TA to automatically answer all incoming data calls (option does not affect analog port). The Rings to Answer number (range: 1—255) selects number of rings the TA waits before answering an incoming call. Default: 1 ring. AT command:

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•Dialing Method ________________________

Select either the Enbloc or the Overlap dialing method for use when establishing a data call. Your ISDN provider determines the dialing method. The enbloc method is used for most ISDN dialing; however, you can select the overlap method if you are working with a private network. AT command: %A97=

•Data Protocol _________________________

The data protocol, also known as the B-channel protocol and the rate adaptation protocol, is the language spoken over each 64 Kbps channel between two ISDN devices. The devices on both ends of the ISDN link must use identical protocols. AT command: !Z

V.120 Protocol—provides rates up to 64000 bps on each B channel.

PPPProtocol—provides rates up to 64 Kbps per channel.

V.110 Protocol— a rate adaptation protocol that adapts the rates of slower asynchronous terminals to the data rate of the ISDN B- channels. 9600 bps V.110 connections are supported by the ISIHP products for compatibility with digital calls originating from GSM networks.

MultiModemISI Hybrid Series, ISIHP-2S/2U/4S/4U/4SD 51