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Buffalo_Mike35 Member	# Posted: 11 Jan 2012 13:07 I have Time Warner out of NY/NJ. For 2 years I had a good connection, 2 months ago my modem has started resetting itself. Since then I've had 5 technicians come out and they replaced my modem 4 times, 3 RCA modems and now a ambit modem. One of the Techs tested every connection, splitter and coupler. He said it might be noise in the line. After he left and the problem was still happening, I got rid of cable service, went with direct tv for tv service. The most recent tech replaced the line from the box on the pole (he even switched ports) to the modem. There are no coupler's or splitters or anything else between pole and modem. So now I've had 4 modems, the RCA and now Ambit and both the error logs are similar. RCA ERROR log ****************************************** Fri Dec 16 15:44:54 2011 Error (4) Map Request Retry Timeout Fri Dec 16 15:44:32 2011 Critical (3) DHCP WARNING - Non-critical field invalid in response. Fri Dec 16 15:44:20 2011 Critical (3) Received Response to Broadcast Maintenance Request, But no Un... Fri Dec 16 15:43:54 2011 Critical (3) DHCP WARNING - Non-critical field invalid in response. Fri Dec 16 15:43:40 2011 Critical (3) Received Response to Broadcast Maintenance Request, But no Un... Fri Dec 16 15:43:12 2011 Critical (3) DHCP WARNING - Non-critical field invalid in response. Fri Dec 16 15:43:01 2011 Critical (3) Received Response to Broadcast Maintenance Request, But no Un... The new AMBIT modem ************************************ First Time Last Time Priority Description Wed Jan 11 13:46:33 2012 Wed Jan 11 13:46:33 2012 Information (7) Downstream sync ok Wed Jan 11 13:46:33 2012 Wed Jan 11 13:46:33 2012 Information (7) Beginning initial ranging... Wed Jan 11 13:46:33 2012 Wed Jan 11 13:46:33 2012 Information (7) downstream time sync acquired... Wed Jan 11 13:46:33 2012 Wed Jan 11 13:46:33 2012 Information (7) Downstream sync ok Wed Jan 11 13:46:32 2012 Wed Jan 11 13:46:32 2012 Information (7) starting ds time sync acquisition... Wed Jan 11 13:46:29 2012 Wed Jan 11 13:46:29 2012 Information (7) Locked on the downstream. Waiting for UCDs... Wed Jan 11 13:46:29 2012 Wed Jan 11 13:46:29 2012 Information (7) Downstream lock ok Wed Jan 11 13:46:28 2012 Wed Jan 11 13:46:28 2012 Information (7) Sync Start Wed Jan 11 13:46:28 2012 Wed Jan 11 13:46:28 2012 Critical (3) Received Response to Broadcast Maintenance Request, But no Un... Wed Jan 11 13:46:28 2012 Wed Jan 11 13:46:28 2012 Information (7) Reset downstream scanning state! Wed Jan 11 13:18:50 2012 Wed Jan 11 13:18:50 2012 Information (7) Map Reject - Downstream Traffic Flow Not Mapped to BPI+ SAID ... Wed Jan 11 13:18:50 2012 Wed Jan 11 13:18:50 2012 Information (7) SA Map State Machine Started ********************************************** ******* From what I've read it's possible a issue with condensed lines or amps. How can I verify this? Other troubleshooting I've done: -Replaced Router -unplugged Router -replaced power supply -plugged straight into wall -bought voltage regulator -all the number's on diagnostic pages are acceptable (both RCA and ambient) When modem is up a I have great speeds, but then it resets itself. I think the key error is "Received Response to Broadcast Maintenance Request, But no Unicast Maintenance" . I just don't know what's causing it or why everyone tied into box on pole is not experiencing the same problem.
Buffalo_Mike35 Member	# Posted: 11 Jan 2012 23:32 - Edited by: Buffalo_Mike35 The first 3 RCA modems used the same power supply, the 4th RCA modem was new and they replaced the power supply. The ambit modem also came with a new modem. I also replaced the power supply on the router when I upgraded from a dlink 214 to a Cisco Linksys e3000. Between the 3rd and 4th modem I switched out my generic surge protector with CyberPower Pure Sine Wave UPS. It's has "Active Power Factor Correction (PFC) and automatic voltage regulation (AVR)" and is suppose to supply clean consistent power. http://www.amazon.com/CyberPower-CP1500PFCLCD-Pure -Sine-1500VA/dp/B00429N19W My house is on the corner, the closest house to the utility pole. I did make a mistake with the last post. There is one coupler outside, which looks required because its where they grounded it. There is about 50-70 ft of RG11 then it hits the coupler on the outside of my house and from there maybe 5 ft of RG6 before the modem. To clarify, they have replaced my modem 4 times, 3 RCA modems (so that's a total of 4 RCA modems if you consider my original) and most recent a Ambit Ubee modem.
Buffalo_Mike35 Member	# Posted: 12 Jan 2012 01:06 - Edited by: Buffalo_Mike35 The following are my numbers from my new Ambit modem. The Ambit modem is a little different from the RCA. The connection status always reads connected and the lights always stay on, even though the log says " Reset downstream scanning state!" and the connection is down. The RCA modem would get stuck in a cycle of resetting itself and I could always fix this by unplugging power from modem and plugging it back in, this always worked, this doesn't always work with the Ambit Modem. With the Ambit modem I find releasing Ip then trying to renew IP through my router works the best. It might take a couple minutes of me trying to renew but when it final is provisioned an IP the connection is up, at least for a little while. These numbers were taking while the connection was down and the errors where being logged. -------------------------------------------------- --------------------------- Cable Modem Status Item Status Comments Acquire a Downstream Channel 549000000 Hz Locked Connectivity State OK Operational Boot State OK Operational Security Enabled BPI+ -------------------------------------------------- --------------------------- Cable Modem Downstream Downstream Lock : Locked Downstream Channel Id : 4 Downstream Frequency : 549000000 Hz Downstream Modulation : QAM256 Downstream Symbol Rate : 5360.537 Ksym/sec Downstream Interleave Depth : taps32Increment4 Downstream Receive Power Level : 7.8 dBmV Downstream SNR : 39.9 dB -------------------------------------------------- --------------------------- Cable Modem Upstream Upstream Lock : Locked Upstream Channel ID : 1 Upstream Frequency : 31800000 Hz Upstream Modulation : QAM16 Upstream Symbol Rate : 2560 Ksym/sec Upstream transmit Power Level : 35.0 dBmV Upstream Mini-Slot Size : 4 -------------------------------------------------- --------------------------- Cable Modem Upstream Burst Req Init Maint Per Maint Short Data Long Data (1). (3). (4). (5). (6) Modulation Type QPSK QPSK QPSK 16QAM 16QAM Differential Encoding Off Off Off Off Off Preamble Length 56 640 384 168 192 Preamble Value Offset 652 0 0 712 712 FEC Error Correction(T) 0 5 5 6 8 FEC Codeword Information Bytes (k) 16 34 34 78 220 Scrambler Seed 338 338 338 338 338 Maximum Burst Size 0 0 0 23 255 Guard Time Size 8 48 48 8 8 Last Codeword Length Fixed Fixed Fixed Short Short Scrambler on/off On On On On On -------------------------------------------------- --------------------------- Cable Modem Event Log First Time Last Time Priority Description Thu Jan 12 00:57:36 2012 Thu Jan 12 00:57:36 2012 Information (7) Sync Start Thu Jan 12 00:57:35 2012 Thu Jan 12 00:57:35 2012 Critical (3) Received Response to Broadcast Maintenance Request, But no Un... Thu Jan 12 00:57:35 2012 Thu Jan 12 00:57:35 2012 Information (7) Reset downstream scanning state! -------------------------------------------------- ---------------------------
Buffalo_Mike35 Member	# Posted: 13 Jan 2012 01:52 No, my microwave isn't close. I originally had it set up in my office upstairs. After getting rid of Time Warner's cable TV's service I moved it downstairs. http://homepage.ntlworld.com/robin.d.h.walker/cmti ps/signal.html The above link has a section "Cable modem spontaneously re-booting" , EMI is listed. If EMI were a problem in my case I think it would affect more then just my modem. I know my closest neighbor doesn't have any issues.
Buffalo_Mike35 Member	# Posted: 15 Jan 2012 10:47 Update: my connection has been up for a couple days now, that's the longest continuous connection in 2 months. What's changed? I'm not sure it's something I changed or something Time Warner change. On some site I saw something about MAC address cloning. I checked my setting on my router and it was set to clone PC MAC address. I turned it off and the network went down. So I turned it back on. The PC MAC address the router was using was for my wired network adapter, I updated this to my wireless network adapter. That's the only change I made and the connection has been up every since. I have directly connected my PC to the cable modem, at that time I was using a refurbished RCA modem and the RCA modem was still resetting. I've also detached my modem from the network and the modem still reset itself.

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