mule@inmet.UUCP (02/02/85)
I am using a 1200 baud modem over a voice grade line and am getting a LOT of static. At first the line was completely unusable, but a guy came out and adjusted the "level" (he said it was "hot" at my end - the origninate end) and now I'm down to an error about every 10-15 seconds. I've tried to get AT&T to look at it, but they say the line is up to "voice-grade" specs and refuse to do anything more (I was going to order a "data-grade" line but was told it would take 6 months to install). Is there anything I can do myself. What does adjusting the "level" mean and can I do it myself ? I have the feeling that another adjustment might be all it would take to fix the problem. One anomaly is that while I get almost continual errors in transmission from the mainframe to my terminal, there are absolutely no errors in the other direction (I dial up to the mainframe so the frequency is higher coming back, but it's hard to believe that the difference is just the difference in frequency - or is it ?) If there are answers to these questions in a book, please point me towards it. Thanks, Fred Mueller
tracyw@islenet.UUCP (Tracy Walters) (02/07/85)
In Article <1938@inmet.UUCP>, Fred Mueller writes: >I am using a 1200 baud modem over a voice grade line and >am getting a LOT of static. At first the line was completely >unusable, but a guy came out and adjusted the "level" (he said it >was "hot" at my end - the origninate end) and now I'm down to >an error about every 10-15 seconds. You didn't mention what type (Brand name and model) of modem you have. >I've tried to get AT&T to look at it, but they say the line is >up to "voice-grade" specs and refuse to do anything more (I was >going to order a "data-grade" line but was told it would take 6 >months to install). They are also very expensive! >Is there anything I can do myself. What does adjusting the "level" >mean and can I do it myself ? I have the feeling that another >adjustment might be all it would take to fix the problem. One anomaly >is that while I get almost continual errors in transmission from >the mainframe to my terminal, there are absolutely no errors >in the other direction (I dial up to the mainframe so the >frequency is higher coming back, but it's hard to believe that >the difference is just the difference in frequency - or is it ?) Adjusting the level is tweaking the power output from your keyer (I assume from this that you are at your office and not at home) and usually requires some specialized test equipment and knowledge. My advice would be get somebody that knows how. The possibility exists that your modem's receiver is having trouble with the lower frequency. Would it be possible for you to take your modem (terminal and all if easier) to another phone line and check it out? Might save you some expense and hassle if that turns out to be the case. A correctly aligned voice grade line SHOULD not have any difficulty with a modem's carrier frequencies, after all, they were designed with that specific purpose in mind. tracyw at Islenet, Honolulu Hi Beaches, Bikinis & Beer While the rest of the nation, And all the population, are enjoying the snow and cold, We in Hawaii must endure the same old Sunshine, Skin and Scotch whiskey. (I know the last line doesn't rhyme, but I was busy staring at Amy Lou Buckner in poetry class) :->