Re: New Modem Troubleshooting Trick
You're probably right. We tried dialing in to it many, many times and it would answer but it would not negotiate with the modem on our end; we would just get silence. It's interesting that dialing in with a modem would not cause it to reset, but dialing in on a phone and then sending random tones resolved the problem. Pretty strange, but it worked! Hi John, I would have thought that if the modem was truly locked up you would have received busy tone from the PSTN switch. What might have occurred is that the modem on release (DCD down) might not have dropped DSR back to the PC or whatever device. You calling the modem it answered DCD came up. You dropped the call DSR dropped and was recognised by the device and your back in business. Not that it matters it worked. This is more of a thought as to why it worked. Teunis, Hobart, Tasmania Australia On Wednesday, February 21, 2001 at 05:50:33 AM, John Neiberger wrote: Actually, this isn't really a troubleshooting trick, but a potential fix for a modem that is locked up. We came in at 4:30 this morning to do some intrusive testing that would take down every automated teller machine in our network for the length of the test. We went through the first steps in the process which took everything down, and then tried to dial in to a remote router that we were testing with. One problem...the modem would answer, or at least pick up, but then would not do anything. It seemed to be completely hung. This was a bad thing. If we didn't do the test today, we'd have to come in again tomorrow morning at 4:30 and none of us were looking forward to that. While pondering our options, I thought of something: call the modem using a regular phone and just start punching buttons on the phone when the modem answers. My reasoning was that maybe some bursty noise would wake it up. We tried it, and to our *great* surprise it actually worked! So, if you ever have a hung modem and there's no one around to reset it, give this a try. Regards, John ___ Send a cool gift with your E-Card http://www.bluemountain.com/giftcenter/ _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] -- www.tasmail.com ___ Send a cool gift with your E-Card http://www.bluemountain.com/giftcenter/ _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: New Modem Troubleshooting Trick
I'll see what I can find out. I've never heard of anyone doing this before, and neither had the other engineer who was here with me. We tried to dial in at least 10 times, and we did wait each time for negotiation to start but it never did. The modem would "answer" because the ringing stopped, but then we'd get nothing but silence. I was frustrated because of the timing of the situation. This was very bad, and there wouldn't have been anyone in the remote building for another three hours so we didn't have physical access to the modem. While pondering, this "solution" occurred to me and I thought it was worth a shot but I did not actually expect it to work. We were both very surprised when it did. The other engineer has been in the field for ten years and he's never heard of anyone trying that before. If I can figure out why it worked, I'll let you know. John Hi John, I am glad this worked for you. I would however like to understand WHY it did. Did the modem finally just reset itself Did you hit a certain tone or combination of tones on the keypad of the phone that caused the remote modem to begin to communicate. Did you just not wait long enough for the modem to begin squawking? These are things you didn't specify. I hope that I can find some documentation on getting a dead modem to begin to communicate and on what causes a modem to answer or go OH and then just sit there. If you run across anything please let me know. Thanks Jim -Original Message- From: John Neiberger [mailto:[EMAIL PROTECTED]] Sent: Wednesday, February 21, 2001 7:51 AM To: [EMAIL PROTECTED] Subject: New Modem Troubleshooting Trick Actually, this isn't really a troubleshooting trick, but a potential fix for a modem that is locked up. We came in at 4:30 this morning to do some intrusive testing that would take down every automated teller machine in our network for the length of the test. We went through the first steps in the process which took everything down, and then tried to dial in to a remote router that we were testing with. One problem...the modem would answer, or at least pick up, but then would not do anything. It seemed to be completely hung. This was a bad thing. If we didn't do the test today, we'd have to come in again tomorrow morning at 4:30 and none of us were looking forward to that. While pondering our options, I thought of something: call the modem using a regular phone and just start punching buttons on the phone when the modem answers. My reasoning was that maybe some bursty noise would wake it up. We tried it, and to our *great* surprise it actually worked! So, if you ever have a hung modem and there's no one around to reset it, give this a try. Regards, John ___ Send a cool gift with your E-Card http://www.bluemountain.com/giftcenter/ _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] ___ Send a cool gift with your E-Card http://www.bluemountain.com/giftcenter/ _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: New Modem Troubleshooting Trick
Hi John, I would have thought that if the modem was truly locked up you would have received busy tone from the PSTN switch. What might have occurred is that the modem on release (DCD down) might not have dropped DSR back to the PC or whatever device. You calling the modem it answered DCD came up. You dropped the call DSR dropped and was recognised by the device and your back in business. Not that it matters it worked. This is more of a thought as to why it worked. Teunis, Hobart, Tasmania Australia On Wednesday, February 21, 2001 at 05:50:33 AM, John Neiberger wrote: Actually, this isn't really a troubleshooting trick, but a potential fix for a modem that is locked up. We came in at 4:30 this morning to do some intrusive testing that would take down every automated teller machine in our network for the length of the test. We went through the first steps in the process which took everything down, and then tried to dial in to a remote router that we were testing with. One problem...the modem would answer, or at least pick up, but then would not do anything. It seemed to be completely hung. This was a bad thing. If we didn't do the test today, we'd have to come in again tomorrow morning at 4:30 and none of us were looking forward to that. While pondering our options, I thought of something: call the modem using a regular phone and just start punching buttons on the phone when the modem answers. My reasoning was that maybe some bursty noise would wake it up. We tried it, and to our *great* surprise it actually worked! So, if you ever have a hung modem and there's no one around to reset it, give this a try. Regards, John ___ Send a cool gift with your E-Card http://www.bluemountain.com/giftcenter/ _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] -- www.tasmail.com _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
