komandur@cs.ucf.edu (Sridhar Komandur) (03/23/91)
I have recently bought a CARDINAL EXTERNAL 2400 modem. It is Hayes compatible and has extended AT set commands. We have *** CALL WAITING *** service Please answer the following questions: 1. Before connect sequence somebody advised me to use "ATS10=4" or set the S10 register value to any value less than 5, so that if there is another call it can be detected. But the problem is whenever there is a call, it disconnects, in the middle of editing a file. - What can I do ( initialization or whatever ) so that whenever there is another call, it gives me enough time to save the file and gracefully log out and answer the other line? - In CALL WAITING we can switch between the two lines. So, is it really necessary for me quit the editor, logout etc, is there a way by which I can come back to where I left after answering the other line ? 2. The manual talks about AUTO ANSWER function quote: "Your MB2400X modem has a built-in AUTO ANSWER function which is controlled by the AT command S0=n. The value of S0 register determines the number of rings necessary before the modem will automatically answer the phone and begin the connect sequence" - I did not undestand what is this function for. Thanks for your help ! Sridhar Komandur EMAIL: komandur@eola.cs.ucf.edu.
root@zswamp.fidonet.org (Geoffrey Welsh) (03/25/91)
Sridhar Komandur (komandur@cs.ucf.edu ) wrote regarding call waiting: >1. Before connect sequence somebody advised me to use > "ATS10=4" or set the S10 register value to any > value less than 5, so that if there is another > call it can be detected. > But the problem is whenever there is a call, it > disconnects, in the middle of editing a file. Whether that is good advice depends on what exactly you wiah to achieve; S10 sets the time, in tenths of a second, that a carrier must be absent before the modem will give up and hang up. Since most call waiting beeps are about a second, the 0.4 second timeout is reached and the modem hangs up. > - What can I do ( initialization or whatever ) > so that whenever there is another call, it gives > me enough time to save the file and gracefully > log out and answer the other line? Setting S10 to a value greater than 10 (I usually use 14) may stop your modem from hanging up... BUT REMEMBER that the other modem may also hang up, in which case you'll have to convince the owner of whatever system you;re talking to to reconfigure his modems as well! > - In CALL WAITING we can switch between the two > lines. So, is it really necessary for me quit > the editor, logout etc, is there a way by which > I can come back to where I left after answering > the other line ? Let's face it, trying to mix answering incoming voice calls and outgoing data calls on the same line using call waiting is a bad idea. In order for this to work, you've got to enable indefinite timeouts on carrier loss, and that is just asking for trouble on the host end (i.e., you can never be sure if a login has disappeared or if he's just off answering an incoming call). If it's that important to handle voice & data calls simultaneously, get another line. I advise all regular modem users to have call waiting removed from their data lines or, at the very least, modify their dialing commands to prefix all numbers with 1170 (or whatever number disables call waiting in your area - check with your BOC). >2. The manual talks about AUTO ANSWER function > quote: "Your MB2400X modem has a built-in AUTO > ANSWER function which is controlled by the > AT command S0=n. The value of S0 register determines > the number of rings necessary before the modem > will automatically answer the phone and begin > the connect sequence" > - I did not undestand what is this function for. If you set ATS0=1, your modem wil pick up the phone and give an answer carrier after it sees one incoming ring signal. If ATS0=2, it will answer after the second ring. If ATS0=0, your modem will not answer incoming calls. If you are not operating a dialin host system, then you'll want to make sure that ATS0=0, or voice callers will get an earful, courtesy of your modem, whenever they try to call you. -- UUCP: watmath!xenitec!zswamp!root | 602-66 Mooregate Crescent Internet: root@zswamp.fidonet.org | Kitchener, Ontario FidoNet: SYSOP, 1:221/171 | N2M 5E6 CANADA Data: (519) 742-8939 | (519) 741-9553 The mile is traversed not by a single leap, but by a procession of coherent steps; those who insist on making the trip in a single element will be failing long after you and I have discovered new worlds. - me
vernon@hpcvaac.cv.hp.com (Vernon King) (03/26/91)
Call up your local phone provider and ask them how to turn off call waiting.
Usually a code is punched into a phone which will turn it off until you hang
up the phone. If you are using a security system like SAM or Defender which
call you back you are out of luck unless your phone provider allows you to
turn off call waiting until you want to turn it back on. IMHO call waiting
does not belong on a phone line being used for a modem.
Vernon