jessea@uunet.uu.net> (01/31/90)
I don't know much about phones, so I thought I post a message to see what I could find out. Here's the scenerio: I've got an internal modem without a speaker. I'd like to know when the modem is using the line without picking up the receiver to check (wouldn't want to do that, would we?). So, can anyone tell me how I can set it up so that I have a light or LED on when the modem has the line (of course it will be on when anyone's on line - I think)? This way I can tell exactly what is going on. I'd also like to know if there is anyway you could rig a setup so that lights can be displayed for an internal modem in the same manner as an external modem. I like to be able to see whats going on. Thanx in advance. Jesse W. Asher - Dynasys - (901)382-1705 Internet: jessea@dynasys.UUCP 6196-1 Macon Rd., Suite 200, Memphis, TN 38134 UUCP: uunet!dynasys!jessea
tad@ssc.UUCP (Tad Cook) (02/03/90)
Jesse Asher asked how to rig up a light that would illuminate when his modem was on-line. Many modems have an A and A1 lead, which are on the outside pair (the black and yellow leads on a modular connector) on the RJ11 telephone line jack. The A and A1 leads short together when the modem is on line. You may have to check your modem manual and option switches to turn this feature on. Just wire up a light and a battery in series with these leads, and you will have your "modem busy" lamp. Tad Cook tad@ssc.UUCP
PEMURRAY@miavx1.bitnet (PETER MURRAY) (02/05/90)
>I don't know much about phones, so I thought I post a message to see >what I could find out. Here's the scenerio: I've got an internal >modem without a speaker. I'd like to know when the modem is using the >line without picking up the receiver to check (wouldn't want to do >that, would we?). So, can anyone tell me how I can set it up so that >I have a light or LED on when the modem has the line (of course it >will be on when anyone's on line - I think)? This way I can tell >exactly what is going on. I would also be interested in this info. I live in an apartment with 3 other compu-nerds with modems, and someone is always picking up the phone on someone else. Any technical advice or schematics or ideas are welcome. Thanks. Peter Murray pm8moper@miamiu.acs.muohio.edu 205 Hepburn Hall pm8moper@miamiu.bitnet Miami University pemurray@miavx1.bitnet 513/529-4944 murrayp@apsvax.aps.muohio.edu
kthompso@entec.wichita.ncr.com (Ken Thompson) (02/08/90)
Here is a circuit that works to indicate a phone line is on hook. Mount the led that lights in a conveniently visible location. |\ | <---------+-------| >|-----+-----'\/\/\/\/`-----+ | |/ | | 22k | | led | | to phone | | | line | | /| | | (green/red) +-------|< |-----+ | (L1/L2) | \| | led | | | <-----------------------------------------------+ This is for information only. No one is encouraged to actually use the circuit. No warranty expressed or implied. Not liable for any direct, consequential, or incidental loss or damage. This circuit has not been certified as complying with Part 68 of FCC regs. WARNING: Telephone circuitry contains potentially lethal voltages. No user serviceable parts inside. Refer all repairs, adjustments and modifications of any equipment to qualified service personnel. Ken Thompson N0ITL NCR Corp. 3718 N. Rock Road Wichita,Ks. 67226 (316)636-8783 Ken.Thompson@wichita.ncr.com
Leonard Erickson <leonard@bucket.uucp> (02/08/90)
>Many modems have an A and A1 lead, which are on the outside pair (the >black and yellow leads on a modular connector) on the RJ11 telephone >line jack. The A and A1 leads short together when the modem is on >line. You may have to check your modem manual and option switches to >turn this feature on. This "feature" is a royal pain if you have RJ-14 jacks. It clobbers the second line every time you use the modem.... Many modems do not allow you to disable this. And *none* of the manuals mention the possible problems of not disabling it on a residence line! Grrrrr... Leonard Erickson ...!tektronix!reed!percival!bucket!leonard CIS: [70465,203] "I'm all in favor of keeping dangerous weapons out of the hands of fools. Let's start with typewriters." -- Solomon Short