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| Forums | USR | external sportster v.92 connection pblm | Watch |
| Author | Topic |
| ed fair Tl Posts: 13 USA | Posted - 7/10/2001 2:03:13 PM    On specific phone lines attempt to connect. Dial tone breaks up like the sprint pcs commercial, some tone, somebody clearing their throat, some more tone, some more clearing, line disconnects. line voltage about 50, swings 10 to 50 while it is diddling, then opens up. V90 modem connects fine 50v before, 10v for tone, back to 50 on disconnect. Line specific, in that I have 2 bad, 2 good. Can't see any differences in voltages or signals. All on 95a, 57/114 connect speeds. 3com 2nd level suspects bad modems but they work on 2 lines. |
| Bob Starnes Tl Posts: 4360 USA | Posted - 7/10/2001 9:00:56 PM Not pulse dialing is it? |
| ed fair Tl Posts: 13 USA | Posted - 7/10/2001 9:56:06 PM waiting for dial tone signal to tone dial. Doesn't get dial tone long enough to start sequence. |
| Bob Starnes Tl Posts: 4360 USA | Posted - 7/10/2001 10:33:52 PM If I'm reading correctly, on 2 lines you see no difference in the line voltage when attempting to dial, if using the same cord with the modem on all 4 lines then maybe you should check to see if the 2 wall jacks are wired correctly. Or might go into more detail with attempts on each line.
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| ed fair Tl Posts: 13 USA | Posted - 7/11/2001 5:35:25 AM on working and non-working 50v prior to dial. at dial working go to 10v and tone dial, non-working go 10,50,10,50,0, then asecond or so later to 50v with no dial tone error message. V90 versions work OK. V92s have the failure. No voltage differences on lines that work with both modems. Voltage swing happens during wait for dial tone on lines that fail with v92 but no voltage swing with v90. Since v90 works phone jack is assumed to be OK. I have reversed tip and ring and have same failure with v92 and operation with v90. |
| Bob Starnes Tl Posts: 4360 USA | Posted - 7/11/2001 11:00:12 AM Only thing I can think of offhand is a possible difference in loop current on the lines but then the V.90 modems should also be affected by these lines. Maybe a flaw in the V.92 code that detects high loop current incorrectly? Tried going offhook (ath1) or dialing with Hyperterminal to see if there's any error messages related to the line other than 'No Dialtone'? |
| ed fair Tl Posts: 13 USA | Posted - 7/11/2001 2:01:07 PM I was thinking more in the line of the modem failing to pull enough current during dialtone to keep the connection up. But I haven't figured out a way of measuring it yet. I'll try to devise a loop current test before I hit the customer office again. I'll also try your suggestions at the first opportunity and advise back. Probably Friday. Thanks for the response. |
| Bob Starnes Tl Posts: 4360 USA | Posted - 7/11/2001 9:36:09 PM Do the V.92 modem have a line relay or semiconductors for connecting to the line? If it has a line relay then the relay should be powered by the computer. Semiconductor (wet DAA) could be phone line powered.
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| ed fair Tl Posts: 13 USA | Posted - 7/12/2001 5:21:29 AM I haven't looked,but USR level 2 indicated semi by the answers to specific questions. I will confirm that answer also. |
| ed fair Tl Posts: 13 USA | Posted - 7/12/2001 7:20:41 PM Have 1 answer for 1 line where 1 v90 worked. Measured current flow indirectly through 100 ohm resistor @ 30ma on a good line. No current flow on the bad line. Used ath1 and picked up clipped and garbled radio program from WSB, 50KW 750 khz, tower 250 yards away and the phone line circles half way around the site about 250 yards from the tower. Appears I have a long line antennae. one v90 worked on the line and 33.6 is in regular use without problems. On to the next site tomorrow. |
| Bob Starnes Tl Posts: 4360 USA | Posted - 7/12/2001 7:43:51 PM Yep, think a 50KW xmitter that close would throw a wrench in the modem works, I suprised that they get any modem to work that close the the tower. |
| ed fair Tl Posts: 13 USA | Posted - 7/12/2001 9:26:34 PM Have 3 usr33.6 on xenix box, 1 usr33.6 on w95, 1 v92 on w95 box, all working. xenix stuff gets some garbage at 1st logon. I would put a v90 on the other 95 but it is the last one I have for troubleshooting. At least the installation tomorrow is 7 miles away from the tower. So it won't be from the same station. |
| Bob Starnes Tl Posts: 4360 USA | Posted - 7/13/2001 6:00:08 PM Remarkable! I sometimes listen to my modem while I'm online just to see how things are going, everytime a CB'er comes by with the mike keyed my modem starts shifting speeds and/or retrains. Get good speeds there? |
| ed fair Tl Posts: 13 USA | Posted - 7/13/2001 8:11:21 PM 95&v92 up into the 40s. w95&33.6 into hi 20s. xenix stuff locked into 9600. Previously failing v92 at 2nd location now working. Looked at voltages and current and everything was cool. Customer can't tell me what I'm plugged into or where it gets to the phone co. but is happy it is working. I'll retry location 3 next week. thanks for the support |
| Bob Starnes Tl Posts: 4360 USA | Posted - 7/14/2001 11:34:58 AM Pretty varied connections there, think I'd try some shielded cord with the modems. Didn't know I was providing any support, thought you were teaching me something |
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