Multitech MTA128ST Owner's Manual download pdf (Page 20)

20-Iway Hopper

Configuration Utilities

Call Control Configuration

4 Persistent DTR Dialing ____________________________________________

A high DTR (Data Terminal Ready) signal on the RS232/V.24 serial port indi-

cates 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 may enable or disable this feature. AT command: $D.

4 Auto Answer Data Calls _______________ Rings to Answer ___________

Select Auto Answer if you want your TA to automatically answer all incoming

data calls (this option does not affect the analog port). The Rings to Answer

number, in the range of 1 to 255, selects the number of rings the TA waits

before answering an incoming call. The default is one ring. AT command: S0=.

4 Dialing Method __________________________________________________

Select either the Enbloc or the Overlap dialing method for use when estab-

lishing a data call. Your ISDN provider determines the dialing method. The en

bloc method is used for most ISDN dialing; however, you can select the over-

lap method if you are working with a private network. AT command: %A97=.

4 Data Protocol ____________________________________________________

The data protocol, also known as the B-channel protocol and the rate adaption

protocol, is the language that is spoken over each 64K bps channel between

two ISDN devices. The devices on both ends of the ISDN link must use identi-

cal protocols. AT command: !Z=.

V.110 Protocol

The V.110 protocol is used to connect slower, pre-ISDN communications

devices to high-speed ISDN lines. It handles rates only up to 38400 bps, and is

used mostly in Europe. The devices on both ends of the link must be set to

identical rates.

V.120 Protocol

The V.120 protocol is similar to the V.110 protocol, but provides rates up to

57600 bps on each B channel.

X.75 Protocol

X.75 is a packet-switched network protocol for international use. The layer 2

portion of this protocol is commonly used as a rate adaption protocol.

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Multitech MTA128ST Owner's Manual Page 20