Same problem in Des Plaines, IL. SB5100 Modem continues to recycle and loose connection since last week. Its been fine for the last year or so until now. Comcast tech said there is no known problem in the area when in fact there is.
Everytime I called they told me there was no problem. I had the SB4100. They kept trying to get a tech to come out. I finally bought the SB5120 and put it on yesterday. I do have a router and after registering on the phone with comcast I have been on since yesterday. I did have to reste once yesterday but I think that may have been caused because I had a splitter to a TV right off the line. Since yesterday it's been ok. Hopefully I won't jinx myself. I did call comcast about being off line yesterday and the person I spoke to said they had the speed upgrade. If you read a post from Jason it says if you modem is over 4 years it may not work. I don't think mine was but it's worth the $60.00 after rebate to stay on line. With all the problems with all these different modems it has to be something comcast did. I never changed anything.
Savannah,Georgia I am having the same problem bought a new modem same thing happened no connection. This has been goin on since Sunday called they said they would be out Wed. did not show so they were coming today Friday well it is 10:35pm and no one has showed. Called 3 times and got different lies everytime. I am on dial up and might just stay. This is ridiculous!!!!
Well, heres a followup to my previous post. My cable modem finally connected after being down all night. There are a bunch of these entries on my SB5100...
1970-01-01 00:11:57 3-Critical 0x040D99C8 DHCP FAILED - Request sent, No response
1970-01-01 00:11:43 3-Critical 0x040D9964 DHCP FAILED - Discover sent, no offer received
1970-01-01 00:11:27 3-Critical 0x04E33A74 Started Unicast Maintenance Ranging - No Response received - T3 time-out
1970-01-01 00:10:40 3-Critical 0x040D9964 DHCP FAILED - Discover sent, no offer received
1970-01-01 00:10:08 3-Critical 0x04E33A74 Started Unicast Maintenance Ranging - No Response received - T3 time-out
1970-01-01 00:09:54 3-Critical 0x040D9964 DHCP FAILED - Discover sent, no offer received
1970-01-01 00:09:15 3-Critical 0x04E33A74 Started Unicast Maintenance Ranging - No Response received - T3 time-out
I also saw a couple T4 timeouts. It looks like the cable modem reboots and cannot aquire a downstream "recieve" channel. Then all of a sudden, it will and works for awhile. I'm also noticing this problem is mainly happening in the evening.
050903095609 3-Critical R02.0 No Ranging Response received - T3 time-out
050903060516 3-Critical R03.0 Ranging Request Retries exhausted
050903060515 3-Critical R02.0 No Ranging Response received - T3 time-out
050903060504 3-Critical R03.0 Ranging Request Retries exhausted
050903060503 3-Critical R02.0 No Ranging Response received - T3 time-out
050903060449 3-Critical R03.0 Ranging Request Retries exhausted
050903060448 3-Critical R02.0 No Ranging Response received - T3 time-out
050903060349 3-Critical T04.0 SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame with
050903060349 3-Critical T01.0 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol tim
050903060348 3-Critical U02.0 UCD invalid or channel unusable
050903060348 3-Critical R03.0 Ranging Request Retries exhausted
050903060348 3-Critical R02.0 No Ranging Response received - T3 time-out
050903060337 3-Critical R03.0 Ranging Request Retries exhausted
050903060336 3-Critical R02.0 No Ranging Response received - T3 time-out
050903060322 3-Critical R03.0 Ranging Request Retries exhausted
050903060321 3-Critical R02.0 No Ranging Response received - T3 time-out
050903060309 3-Critical R03.0 Ranging Request Retries exhausted
050903060308 3-Critical R02.0 No Ranging Response received - T3 time-out
050903060256 3-Critical R03.0 Ranging Request Retries exhausted
050903060255 3-Critical R02.0 No Ranging Response received - T3 time-out
Keeps happening, same cycling problem as with my old 3COM modem, except not nearly as bad. Now it happens once ever 12 hours or so, but sometimes 5-10 times in the space of 1 hour. Guess it's just bad luck, eh?
RE: SB4100 modem. Same problem. Tech came out and said a recent "upgrade" to the system apparently was not compatible with SB4100 so he installed a Comcast(SA) modem and that solved problem. Tech stated he had encountered several instances of this problen in our(Central CA) area.I don't know if the so called "upgrade" was a national or local event. Now the problem is since the Comcast Modem does not have the standby mode as does the Surfboard I have to power off the modem to disconnect from internet and it seems to always require a reboot to establish block synch after modem power on.
Comcast has not been replying to this thread. I have
seen other posts where the subject addressed to the
moderator of the Help Forums, a Comcast employee, Jason1, which got a reponse perhaps because the subject line stands out pointedly addressing them. Please consider adding to the thread I started " Jason1/Comcast:Any response to SB4100 buggy upgrade? "
to just say a quick "me too" if your modem
still has the buggy firmware (even if you upgraded routers to fix it), which also keeps it near the top of the thread list. though I suspect many have stopped bothering to read this thread.
My 5120 has been up for about a week I guess now with no reboots.
I do get ocassional:
050902211335 3-Critical R02.0 No Ranging Response received - T3 time-out
ever few hours in the error logs but there doesn't seem to be any effect(i.e. there is no service disruption). I've emailed a tech I been in touch with at Motorola for a decent description of what might cause the T-3's but I'm guessing that it's nothing important.
As for the other poor guy with the "bad" 5120, did you get your 5120 from Comcast and did they register the MAC? That error log almost looks like that modem hasn't been registered. Just curious...
We upgraded a few days ago to a Xincom router instead of our BEFSR41, and things have been much better (though we *have* had a couple of T4 reboots, but with many hours between instead of seconds or minutes.
The most recent log messages were a bit puzzling to me -- does anyone have any idea what these mean? (or, rather, why I'm getting these messages?):
050903223721 5-Warning D103.0 DHCP RENEW WARNING - Field invalid in response
050903223721 4-Error D530.8 DHCP - Invalid Log Server IP Address.
So I'm connected to http://192.168.100.1 and I have Thomson Cable Modem Diagnostics cycling regularly, but I do not see a logs tab to click. I'm using Firefox.
BTW, they are sending a tech out tomorrow because I've "been living with this problem for too long and we want to make sure its not the modem" according to the CS person I spoke to today. I really don't want the tech visit and I tried to tell with her that if it was the modem, the problem would be happening all the time, not in cycles.
I have no other option in my area for high speed internet, so I'm stuck with Comcast.
I'm having the recyling problem with an RCA DCM245 modem and a Linksys WRT54G router. I'm in Chicago, Wicker Park area. Seems to work fine when connected directly to the modem. I moved here about a month ago; my roommate already had Comcast but I was the one to set up the router. Acutally bought a new router because I thought that was causing the recycling problem. Bit better now, but the last few days it's been recycling every five min. We're considering going DSL. I'll ask her about it again.
Here is my modem log , dont know what it means though
050907105155 5-Warning B605.10 Map Reject - Downstream Traffic Flow Not Mapped to BPI+ SAID
050907100646 3-Critical R02.0 No Ranging Response received - T3 time-out
700101000012 3-Critical R05.0 Started Unicast Maintenance Ranging - No Response received - T3 time-out
050907084231 3-Critical R02.0 No Ranging Response received - T3 time-out
700101000012 3-Critical R05.0 Started Unicast Maintenance Ranging - No Response received - T3 time-out
050906083350 3-Critical R02.0 No Ranging Response received - T3 time-out
700101000011 3-Critical R05.0 Started Unicast Maintenance Ranging - No Response received - T3 time-out
050823122020 3-Critical R02.0 No Ranging Response received - T3 time-out
700101001617 3-Critical T01.0 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol tim
700101001617 3-Critical U02.0 UCD invalid or channel unusable
050803012528 3-Critical T01.0 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol tim
050803012528 3-Critical T04.0 SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame with
050803012526 3-Critical R03.0 Ranging Request Retries exhausted
050803012525 3-Critical R02.0 No Ranging Response received - T3 time-out
050803012516 3-Critical R03.0 Ranging Request Retries exhausted
050803012516 3-Critical R02.0 No Ranging Response received - T3 time-out
050803012459 3-Critical R03.0 Ranging Requests Retries exhausted
050803012458 3-Critical R02.0 No Ranging Response received - T3 time-out
700101000014 3-Critical R05.0 Started Unicast Maintenance Ranging - No Response received - T3 time-out
050729082733 3-Critical R02.0 No Ranging Response received - T3 time-out
My modem has been recycling without establishing connection pretty much every afternoon for the last 2 weeks. After reading this thread I got the idea that perhaps my 3com "Shark Fin" modem was out of date or something so I ran and bought a Linksys WCG200. Here we are again the next afternoon and it is dead too. Obviously not a modem problem.
I've called Comcast Friday and yesterday and everytime they get stumped and schedule a tech to come out. I just hope the problem is present when he comes because without doing anything, usually in the late afternoon it fixes itself.
I just "chatted" with Comcast support. The result is 'unsatisfactory'. No solution and I have to wait for the tech this Friday.
Now my biggest complaint is the wager they make with you. I may get charged $50 if the tech finds nothing wrong with my connection. Given that the problem is intermittent there are pretty good odds that he will come at a time when everything is working well.
However, it is clear that I have proven and documented with comcast that this problem is intermittent. I was on the chat service for a while yesterday. They saw that they could not get to me, my connection was out. Later that afternoon, with my new modem, it was configured proving that my connection was reestablished.
Would it had been my new modem? Certainly not, it is not working right now. And now the only thing to wait is for it to get fixed this afternoon as it does magically.
SB5120, 30mi N of Boston. Recycling for the past 18 hours. Unacceptable service. Working at the moment, average 5% packet loss. This is absolutely ludicrous, and I'm more than ready to switch to DSL until Verizon's FIOS hits my area if this continues.
Tech support has been lackluster at best, with some denying the problem and others scheduling service calls which are literally weeks away. Apparently the techs are all booked up because of local problems. This topic, and that piece of evidence are the only things keeping me with Comcast, hoping that eventually, over the next couple weeks, the problem will be resolved.
If it is not, I'm switching. It's not my burden to resolve Comcast's problem by buying enough cable to rewire my entire house or buying a cable modem that won't even work...
Same here in Skokie, IL for 6 moths. SB4100 hangs itself, usually during early afternoon 1-5pm and is totally out. Need to unplug the cable and powercod. At first, it rebooted itself pretty quick until recent; it takes longer and longer like 8 mins to recycle. Sometimes I have to unplug, replug several times in order to make it work!!!! Call Comcast, sent a tech with a fee, no way. Comcast should do something.....
Please visit the first 2 sticky threads in this connection forum for some suggestions you can follow to correct your connection issues. If the suggestions do not resolve the issue, please make sure you review this thread and post the requested modem signal levels and tracert/ping information. Once we see this information, we will be able to offer you more assistance.
As for the fee for sending a technician out, please disregard this as it is merely a legality issue that our reps must state on the event that the tech charges for some equipment replacement. Also, any tech that performs work on your connection must receive your consent before working on your connection and charging you - and you do have the right to deny any charges on site. But sending a technician out is necessary so they can monitor the connection from your end and find where the issue is occurring.
I have the SAME problem. I have a RCA DCM425 that is a rental from comcast. My modem keeps recycling and i even called a tech out to see what was wrong. But right like 3 hours before the tech got here, I tried again and my modem started working, no recycling for atleast 1 hour so I cancelled my appointment in fear of that I would have to pay 50 bucks when they see there's nothing wrong with the modem.
Even though there is something wrong with mine, now the recylcing is getting worse, about every 15 minutes.
I have in the Philadelphia area and I have no router hooked up. I don't know what to do. Please advise me because I am not going to pay $60 for this every month.
Message was edited by: Anon1445419
Message was edited by: Nik3t
I've been having the same problem for about a month now.
Tech support said I have a virus. I've got a firewall between my cable modem and my computers. And, it happens with both computers. I'm not buying the virus story.
I've been reading a forum at DSL-Reports (http://www.dslreports.com/forum/remark,14152519) and they seem to have a line on what's going on. Some of the people on that forum have found that there has been a fireware upgrade that Comcast has sent to our cable modems, now if you connect to your cable modem at 10Mbps speed the cable modem keeps rebooting, but if you connect to it at a 100Mbps speed it works fine. Check out the forum.
I would like to see Comcast push a fix for the bad firmware they sent us.
Intermitted Sync Block... OMG..."so in otherwords your not exactly sure what the problem is?..."
"um no sir, but we are dispatching a technician to repair the problem today" ~operator the sets up service call with me.
For two weeks I have had problems. Customer service at comcast really scraps the underside of the barrell (no pun intended for you cable guys). Ok so my speed is actually half what it's supposed to be 3200 Down 373 Up, not the 6MB/s they advertise. I call comcast SEVEN times in one day, get hung up on 2 times during 'call transfers', get sent to wrong department 3 times and then told that they can't transfer calls (uh? what did you just do), get forwarded to the Fort Lauderdale call center which freaks out so bad they give me the direct line to the actual comcast technicians (yes they have real technicians, not contractors), then told I have to call back by them to tech support because I'm not a comcast technician. My head hurts.
So we have 2 cable lines coming into the house, one for phone, one for cable and internet (same line). Tech gets there (and btw he's a great guy), does a speed test and determines there is a problem. He replaces EVERYTHING from the modem to the street (Cable, connectors, I mean everything, oh and yes I watched him). We go back and he tells me that I'm getting a new protype modem. Oh really? He says it walks the dog and I will be very pleased with the results. He sits back down in my little NOC and does the test. His jaw hits the floor and I roll over laughing as my speed is now 623 Down and 378 Up. That's right you read it correctly, 623. Fantastic. I start looking around to make sure I'm in the year 2005. Any slower and I could get a dial up service to compete with comcast.
He radios his tech for line testing (kinda thought that's what he was doing) for a service call only to hear on the other end of the NEXTEL "hey man the starter went out in my truck (I'm a slacker and shaming out of work tonight since it's 7:00PM). The Tech calls his boss, but the phone is busy (actually it stays busy for over an hour). While we wait for his boss we sit down and talk. He finds out I'm a IT professional (Domain Administrator for a local county government) who actually specializes in Hardware. I break him down and he tells me the real story.
Comcast has done many upgrades. Some include voice. In certain areas these "plants" as they are called are not being upgraded. Comcast wants to upgrade the product and introduce new services, but not from their side, from ours. I have come to the conclusion that all the cable goes through many different devices, and one of these is a called a circuit. The circuit is linked for a certain speed. In order to upgrade the speed you have to replace the circuit. A typical neighborhood like mine may have 8 cable internet users so a circuit like say (6mb/s x 8 people = 36 or a 48MB relay circuit) would have a circuit to accommodate that amount. What happens though if say the entire neighborhood goes to the same Internet cable service? Well that 48MB relay then must handle the traffic of all those users, say 200. Now instead of each user having 6mb/s connection, that 48mb circuit is divided by 200. The end result is that those original 8 people now have a 256mb download and 378 upload (no it doesn't really change on the up).
What is the solution? Comcast needs to look at their infrastructure in your area (and mine). Then they need to bite the bullet, get off their lazy, no customer service, hiring untrained and unqualified contractors, back sides and do the right thing. UPGRADE THEIR PLANT IN YOUR AREA. Put a higher circuit in. Give you the connection you pay for! This is ridiculous and my time is valuable. Comcast surely doesn't pay my salary, so when they schedule an appointment during my working hours, in which I have to be there, I should charge them. STOP UNCONVINCING YOU THE CUSTOMER. I could rant and rave all day, but its now 7:00am and I got work to do. Good luck. Hope this helps. I left a lot out, but this last paragraph says it all.
I have been a comcast customer for a few years.I have a RCA modem that i rent from them and with in the last 6 months to a year it started loosing connection.If i power cycle it then all is well for some times a few hrs or over night.It really raises heck with my voic over ip phone service i have to reboot that too.This is getting very old comcast.
How is your first post an update.. and if you have a problem.. there's this sticky thread (thread in grey) at the top, that asks for specific information so we other users can help you... And reviving a very old thread is not the right approach.. Start a new one once you get that information
Because this is the same problem everyone else is having. Here is the Log file as of now:
060323191044 8-Debug M570.2 Motorola CM certificate present
060323191044 8-Debug M571.7 CM Cert Upgrade Enabled. Initiate after Registration
060323191044 8-Debug I503.0 Cable Modem is OPERATIONAL
060323191044 7-Information B401.0 Authorized
060323191043 8-Debug F502.1 Bridge Forwarding Enabled.
060323191043 8-Debug F502.3 Bridge Learning Enabled.
060323191043 7-Information B0.0 Baseline Privacy
060323191041 7-Information X518.9 Configuration - MMFMMD - Unit Update Enabled by CVC
060323191041 8-Debug I500.1 DOCSIS 1.0 Registration Completed
060323191041 7-Information I500.4 Attempting DOCSIS 1.0 Registration
060323191041 7-Information D509.0 Retrieved TFTP Config File SUCCESS
060323191041 7-Information D507.0 Retrieved Time....... SUCCESS
************ 7-Information D511.0 Retrieved DHCP .......... SUCCESS
************ 5-Warning D3.0 DHCP WARNING - Non-critical field invalid in response
************ 4-Error D530.8 DHCP - Invalid Log Server IP Address.
************ 5-Warning D520.2 DHCP Attempt# 1 BkOff: 5s Tot DSC:1 OFF:1 REQ:1 ACK:1
************ 7-Information D0.0 DHCP CM Net Configuration download and Time of Day
************ 7-Information T500.0 Acquired Upstream .......... SUCCESS
************ 8-Debug T503.1 Acquire US with status OK, powerLevel 47, tempSid 4325
************ 8-Debug T505.0 Acquired Upstream with status OK
************ 7-Information T501.0 Acquired Downstream (715785700 Hz)........ SUCCESS
************ 8-Debug T509.0 Acquired DS with status OK, DS Freq 715785700, US Id 3
************ 7-Information I510.0 *** BOOTING *** SB4100-18.104.22.168-SCM00-NOSH
060323190954 7-Information H501.2 HFC: Shutting Downstream Down
060323190954 2-Alert T507.0 Received Async Error Range Failed
060323190954 3-Critical R4.0 Received Response to Broadcast Maintenance Request, but no Unicast Maint
060323190954 3-Critical H501.8 HFC: T4 Timer Expired
The T4 Timer Expired seems to be the problem causing the modem to restart. I've had this modem hooked up straight to my computer and the same rebooting continues to happen. I've had this modem plugged straight into the cable line from outside, which is plugged directly into my computer and the same problem persists.
This just started happening (again , last time it happened about 6 months ago but was 'magically' fixed) 2 days ago.
Frequency 715785700 Hz Locked
Signal to Noise Ratio 35 dB
Power Level -11 dBmV The Downstream Power Level reading is a snapshot taken at the time this page was requested. Please Reload/Refresh this Page for a new reading
Channel ID 3
Frequency 23996472 Hz Ranged