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Howdy: The IBM line tester is called the "IBM modem saver". The product number is 73G5395. The unit has 3 LEDs, labeled as follows: [Green] "Normal" [Yellow] "Polarity Reversed" [Red] "Over Current" It is packaged in a pen-like format, with an RJ11 plug at one end mounted on a flexible rubber mounting, which allows you to bend the unit to get a good look at the LEDs when you are testing. It also has a clip on the back, so you can clip it to your shirt pocket (very stylish!). According to the label on the back, you interpret the readout as follows: "Normal: OK to connect modem Reversed Polarity: modem operation may be impaired Over Current: modem damage likely" The unit set me back about $50 CDN, and I picked it up at the IBM Outlet store here in Ottawa last year. Hard to say whether it is worth the money. I have used it a few times (hotels, etc.), but I now have a Megahertz XJ2288 modem, which supposedly has protection against digital line damage anyways. Let me know if you have any questions. Cheers, Rob Dickson dickson@nortel.ca In message "Re: Use of a modem on a digital (?) line ...", 'bsabini@rad.net.id' writes: >I think there is an IBM line tester, if indeed the line >is analog/digital. I can't remember the model but if you do get it >post the model number. It should not be too expensive. > >-- >bsabini@rad.net.id