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| Thread ID: 78701 | 2007-04-25 07:46:00 | Caller Alert/Dial up speed. | Gordon62 (11771) | Press F1 |
| Post ID | Timestamp | Content | User | ||
| 544244 | 2007-04-26 22:44:00 | pctek is correct (as usual). The initial connect speed may quickly "train down" as noise is encountered, but the reported speed never alters. I am led to believe that once they train downwards due to noise, they will not train upwards again in that connect session. Apparently the expensive "rural modems" also train upwards. In my rural location I do notice this when using a chep internal PCI modem, it trains down steadily (going by download speeds) until it gets to a few bytes per second. Only a disconnect-reconnect seems to help. I use a serial hardware external modem usually, as noted set to connect at 33.6 kbps, that gives a largely unvarying download speed which is "almost acceptable" The electric fences are somewhere unknown, turning off the 2 local ones has zero effect. Broadband is not an option, it is well outside the coverage area. |
godfather (25) | ||
| 544245 | 2007-04-27 00:22:00 | looks like godfather is probably on to it with the impedance thing. I will say it's very unusual to have a add-on device increase the connection speed - most have the opposite effect. Unless of course it's an active device with some form of gain. As for rural situations and long phone lines - often connecting at a lower speed is desirable for increased stabilty & consistency, and going down to 33.6 switches to a different protocol which can be more reliable. The electric fence issue has long been a nightmare for Telecom, the type that sends pulses upsets all sorts of services not just internet connections. This is especially true if they are not earthed properly and when the fence runs parallel to the telecom cable. I wouldn't be concerned if you are getting anything over 40kb then your connection is pretty good. |
dugimodo (138) | ||
| 544246 | 2007-04-27 02:27:00 | The modems I saw were "professional" quality (costing over $1000 in the 1980s) and were used on leased lines. The adjustment was not done to impress CBers; it was to get best performance on the network. There was a BNC connector on the back to connect an oscilloscope to see the eye pattern. You could see the improvement. "56k bps" is pushing the limits on telephone lines much more than 9600 bps did. A passive resistive attenuator might "tame" a mismatched line. 3dB drop shouldn't matter. |
Graham L (2) | ||
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