clpg@aluxp.UUCP (munro) (02/23/84)
[gulp] I have a Hayes 1200 Smartmodem; my phone company is a small, independent outfit in rural Pennsylvannia. The Smartmodem will work fine at 300 baud, but not at 1200. It *sounds* ok (during initial sequence), but doesn't acquire the carrier. I've had the phone company out. Here's what's been done so far: 1) Try other Smartmodems. Try the non-functioning one from another location. --> expected result. 2) Try a 212 dataset. --> N.G. 3) Disconnect all other phones in house. --> no different. 4) Find a neighbor with a system, see if he can run at 1200 baud. --> he has no problem. 5) Measure the 'loss' on my phone line from the office. --> (by phone co.) 4.8db - this is 'real good'. 'Maybe its *too good* and you have to put in an attentuator'. 6) Tried a 600 ohm pad (attenuator), with switch-variable settings from 0 to 40 db, 2 db steps. Tried all settings. --> n.g. 7) Measure the noise on the phone line. 'It reads 15 - 22.' This is also 'real good.' --> ...sigh Any hints, additional experiments, insights, etc. would be most welcome. Dave Munro (...whatever)!ihnp4!aluxp!clpg