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10 Meg Problem With Motorola Modem
Hello everybody:) ,
Er and a specially big hello to Ignition as he appears to have immense knowledge, depth and drive to help people here!:) I am a new Telewest 10meg Broadband and Supreme TV customer. I bought this on 16th November but only started to use it since last week. I bought the 35£ broadband elite option just because it was 10meg connection. I have checked my speeds because it appeared to be slower than the 2meg NTL connection i previously had at my previous place.:confused: I have called TW customer support many times but they are totally unwilling to help, dont even like to hear about speed tests and say that they can only test speed from their server offering evaluation games. Even that was slow.:mad: I have checked my cable modem which is a Motorolla SURFboard cable modem and following is the detail: ================= Downstream Value Frequency 331000000 Hz Signal To Noise Ratio 41.2 dB Power Level 0.4 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 ================= Upstream Value Channel ID 2 Frequency 29000000 Hz Power 54.0 dBmV ================= The Upstream power was 55.5 dBmV 3 hours ago. Following are the cable modem's logs: ================================= Time Priority Code Description 2005-12-06 21:53:22 4-Error E107.0 SW upgrade Failed after download - Incompatible SW file 2005-12-06 21:53:21 6-Notice E102.0 SW Download INIT - Via Config file cm-10240-384 2005-12-06 21:53:21 6-Notice I401.0 TLV-11 - unrecognized OID 1970-01-01 00:00:13 3-Critical D003.0 DHCP WARNING - Non-critical field invalid in response. 2005-12-06 20:14:36 6-Notice E102.0 SW Download INIT - Via Config file cm-10240-384 2005-12-06 20:14:35 6-Notice I401.0 TLV-11 - unrecognized OID 1970-01-01 00:00:15 3-Critical D003.0 DHCP WARNING - Non-critical field invalid in response. 2005-12-05 19:48:06 6-Notice E102.0 SW Download INIT - Via Config file cm-10240-384 2005-12-05 19:48:05 6-Notice I401.0 TLV-11 - unrecognized OID 1970-01-01 00:00:10 3-Critical D003.0 DHCP WARNING - Non-critical field invalid in response. 2005-12-05 18:16:42 3-Critical R005.0 Started Unicast Maintenance Ranging - No Response received - T3 time-out 2005-12-04 08:31:46 5-Warning D103.0 DHCP RENEW WARNING - Field invalid in response 2005-11-28 19:25:18 4-Error E107.0 SW upgrade Failed after download - Incompatible SW file 2005-11-28 19:25:16 6-Notice E102.0 SW Download INIT - Via Config file cm-10240-384 2005-11-28 19:25:15 6-Notice I401.0 TLV-11 - unrecognized OID 1970-01-01 00:00:14 3-Critical D003.0 DHCP WARNING - Non-critical field invalid in response. 2005-11-25 21:08:22 4-Error E107.0 SW upgrade Failed after download - Incompatible SW file 2005-11-25 21:08:20 6-Notice E102.0 SW Download INIT - Via Config file cm-10240-384 2005-11-25 21:08:20 6-Notice I401.0 TLV-11 - unrecognized OID 1970-01-01 00:00:18 3-Critical D003.0 DHCP WARNING - Non-critical field invalid in response. 1970-01-01 00:00:08 3-Critical R002.0 No Ranging Response received - T3 time-out 2005-11-16 15:08:52 6-Notice E102.0 SW Download INIT - Via Config file cm-10240-384 2005-11-16 15:08:52 6-Notice I401.0 TLV-11 - unrecognized OID 1970-01-01 00:00:18 3-Critical D003.0 DHCP WARNING - Non-critical field invalid in response. 1970-01-01 00:00:10 3-Critical R002.0 No Ranging Response received - T3 time-out 2005-11-16 15:03:40 6-Notice E102.0 SW Download INIT - Via Config file cm-10240-384 2005-11-16 15:03:39 6-Notice I401.0 TLV-11 - unrecognized OID 2005-11-16 15:03:37 3-Critical D003.0 DHCP WARNING - Non-critical field invalid in response. 2005-11-16 15:03:29 3-Critical R002.0 No Ranging Response received - T3 time-out 2005-11-16 15:03:21 3-Critical T002.0 SYNC Timing Synchronization failure - Failed to acquire FEC framing 2005-11-16 15:03:08 3-Critical T001.0 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing 2005-11-16 15:03:08 3-Critical T002.0 SYNC Timing Synchronization failure - Failed to acquire FEC framing 2005-11-16 15:03:06 3-Critical T001.0 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing 2005-11-16 15:01:56 3-Critical R004.0 Received Response to Broadcast Maintenance Request, But no Unicast Maintenance o 2005-11-16 15:01:56 3-Critical T001.0 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing 2005-11-16 15:01:42 3-Critical T002.0 SYNC Timing Synchronization failure - Failed to acquire FEC framing 2005-11-16 15:01:34 3-Critical T001.0 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing 2005-11-16 14:59:35 5-Warning D103.0 DHCP RENEW WARNING - Field invalid in response 2005-11-16 14:29:38 4-Error E107.0 SW upgrade Failed after download - Incompatible SW file 2005-11-16 14:29:37 6-Notice E102.0 SW Download INIT - Via Config file cm-10240-384 2005-11-16 14:29:37 6-Notice I401.0 TLV-11 - unrecognized OID 1970-01-01 00:23:12 3-Critical D003.0 DHCP WARNING - Non-critical field invalid in response. 1970-01-01 00:23:08 3-Critical D001.0 DHCP FAILED - Discover sent, no offer received 1970-01-01 00:21:58 3-Critical R002.0 No Ranging Response received - T3 time-out 1970-01-01 00:21:47 3-Critical D001.0 DHCP FAILED - Discover sent, no offer received 1970-01-01 00:18:35 3-Critical R002.0 No Ranging Response received - T3 time-out 1970-01-01 00:18:28 3-Critical T002.0 SYNC Timing Synchronization failure - Failed to acquire FEC framing 1970-01-01 00:18:16 3-Critical T001.0 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing ======================================== Can anyone, specially :)Ignition:) please help as the CS staff and the second line female engineer were useless and could not offer me any support? Does this Motorola SURFboard cable modem capable of 10meg? Modem details: Motorola SURFboard cable modem Software Version: SB5101E-0.4.1.4-SCM02-NOSH Hardware Version: 1 MIB Version: II GUI Version: 1.0 Thank you, Rashid Khan |
Re: 10 Meg Problem With Motorola Modem
o_O
Modem is fine, problem looks like an upstream issue and will probably need an engineer to check it out. Most of the errors there suggest issues talking back to the kit at Telewest, the high power level also indicates this, if I'm thinking straight that power level is out of spec for the upstream type that Telewest use in some areas, which is probably the case for you. Not unusual as Telewest have been known to upgrade areas in this way for the extra bandwidth and worry about the faults it might cause later. |
Re: 10 Meg Problem With Motorola Modem
I am getting the same sw upgrade failed on my modem, I called support to see if I had been upgraded, they told me my area had but as I was a 256kb customer I wouldn't get any upgrade. Trouble is I'm on elite 2mb never been a 256kb customer they then told me to ring customer service, which I did and they are telling me my area hasn't been upgraded yet and there is no date for the upgrade yet.
Not the best customer service in the world! (Glad I left) |
Re: 10 Meg Problem With Motorola Modem
Downstream should be 331Mhz
Upstream 22-45mhz Frequency power levels down -12 - 4 up 34 -56 SNR min 29 max 36 ( yours is 41) can effect conection quality. |
Re: 10 Meg Problem With Motorola Modem
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Power levels can go above +4dBmV with no issues. Telewest aim for +1dBmV. Modems should be ok between +15dBmV and -15dBmV, recommended between +10 and -10 though, +12 to -12 a good figure to allow some variation with the weather. Upstream power of 55dBmV can be critically high depending on the modulations used in the upstream, it can infact be out of spec and cause connection drops. In some Telewest areas this will cause drops, in some it'll be about ok. Recommend this isn't any higher than 52dBmV for decent operation and some safety margin. SNR there is no upper limit really, the higher the better. This is a measure of the average power of the wanted signal less the averaged power of the background unwanted noise - how can this be too high unless it's a ridiculous figure that's clearly a mis-reading? 29 is pushing it somewhat, really this needs to be upwards of 33dB if using (as the cable operators do virtually everywhere now where they are on DOCSIS) 256QAM downstreams. NB using 'average(d)' for the sake of argument, it's actually not entirely accurate but I can't be bothered with explaining why it's not entirely accurate, it's good enough ;) EDIT: Bit of an old one to resurrect? |
Re: 10 Meg Problem With Motorola Modem
The channel of the cable modem t gain accsess to the 10mb connection shud be channel 3.
Channel 2 is normally a busy Telewest server for 2mb and 4 mb customers Channels 3 4 are reserved for 10mb customers. Once the channel has been changed save the changes and press Restart cable modem. The Cable Modem Restart can take from 5 mins 2 30 mins, depending on ho busy the servers are at Telewest |
Re: 10 Meg Problem With Motorola Modem
i some how dont believe the channel for 10mb users is #3, its just as bad as all the others mate.. average ping to bbc.co.uk is 44ms, been advised this should be a lot lower. downloaded from gamefiles.blueyonder.co.uk levelling out around 100k/sec - we had better speeds than this on the 2mb service
its a joke. |
Re: 10 Meg Problem With Motorola Modem
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The individual 'channels' bear no relation at all to which tier of service a customer is on, nor is there anything enforcing channels on customers depending on their tiers. Any perceived issues with a particular channel are down to either poor balancing or problems on one or more upstream channels causing modems to migrate to other channels. The restart should take less than a minute generally. The load on Telewest's servers should never be so high that a modem will be waiting this length of time to be given an IP address. Modems should remember the last set of parameters they connected with and attempt to use those initially, and only if those fail should there be any reason for the modem taking the time to rescan frequencies. A full rescan can take hours. A more likely course of events is that due to local network segmentation your modem is unable to use the requested upstream channel, so it'll give that a pop and after a little while give up and resynch to a different channel being offered by the Cisco uBR. If Telewest's servers can take up to 30 mins just to look up a few details in a database, grant an IP address over DHCP and send a small config file with TFTP speed issues are the least of our worries. Actually I see you work for BY support, or have it listed in your interests anyway. If you are interested in broadband tech support you need to get out more ;) Anyway http://www.cablemodem.com and the documents on there will provide a good grounding on cable modem standards and recommended implimentations. The stuff you've provided above would waste so much bandwidth and cause so many issues it wouldn't even be funny. |
Re: 10 Meg Problem With Motorola Modem
Hmm well now he could work for the special BY TEC support, the ones you get to talk to who will advise you to format your P C, blame everything but the pope, then hear voices that tell them to read page 2 of the good BY support teams brief that says if all else fails and you can't blame the tec just say some areas are having problems at the moment and we are fixing it...
As for the real problem here, yep mostly right Ignition, now the speck is +3 to _7. taking into account the +7 db in a 256 area.. it still could be a modem fault here, as some will misread...and 56 is to high... will still work but with slow speeds, loss of connection and finnally giving up and no connection at all... channels are set and on some modems can be changed but may go back to whatever is available, yep sometimes they do get to busy and moving up will be a temp fix... his high upstream could be anything from a bad connector, damaged drop, faulty modem, fault in the network.. A trace will tell you which hop is giving probs, and by how much.. people spend their time pinging places and just clog up the network, besides data that is being sent will move over them hence at times they will drop packets.. that is the way it is designed to be... okies so far.. some here seems well informed and give out really good advice, others well they are the reason I wake up smiling, there is nothing worse that putting something inprint that makes a fool out of the poster... MY MOTTO, DON'T BEWARE THE MAD PEOPLE THEY WON'T HURT YOU, ITS THE SANE ONE'S YOU HAVE TO WATCH...:angel: HAVE A GOOD DAY GUYS |
Re: 10 Meg Problem With Motorola Modem
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Ooo that chap from my Digital Spy, hello sir. The +7dBmV the power at the launch amp? Oki doki. Not essential but thanks for the info. You'll probably regret saying what your specs for power levels are now though, people will think they need to be in that range for it to work ;) Are you chaps running 16QAM on the returns in Rashid's area? If you are the 55.5dBmV is outside of the modem and DOCSIS specs :( Hope I'm not one of the people who makes you laugh when you wake up :p: P.S. If you find out anymore about Zoltron let me know :p: I post on there as well ;) |
Re: 10 Meg Problem With Motorola Modem
ok i'm a telewest engineer just thought i'd add my 10cents:
10mbs modem models - motorola surfboard 5100, 5200 webstar EPC2100 V2 there are others but we dont install them anymore so if u've got an old one ask for a new one or just "accidentally" break it! then make sure the tech gives you one of those models. if they try to give you a webstar dpx100 they're crap anyways so just aviod them. signal levels - '-15' downstream is within spec?!? are you mad?! -7 is the lowest you can go and expect a serivce! even then you'll lose it completely at peak times. upstream levels - this ones important -you can get away with 56, but again like the downstream you'll lose service at peak times. anything under 50 and your laughing. you can expect to lose 1-3dB at peak times on the down which means a similar upstream rise. as for changing upstream channels it can help lower ur upstream, but wont help download speeds - the main problem is people downloading huuuuuuuuuuuuuuge vast mahooosive amounts of data all day all nite! and also remember that our networks were instaled a while ago - anyone remember analogue Cable TV?? hmm?? so a network primarily designed for analogue then being upgrade to digi is gonna give you issues eventually! its plain ol' common sense. Especially with the amount of data they cram down a bit of coax into your house now. and those people who say "i kno the advert says 'upto 10meg' but a service that only reaches 5-6meg??" STOP THERE YOU'VE ANSWERED YOUR OWN FRIKKEN COMPLAINT! UPTO! not garunteed at all. anyway thanks for reading. |
Re: 10 Meg Problem With Motorola Modem
[quote=Ignition]What are you on about?
The load on Telewest's servers should never be so high that a modem will be waiting this length of time to be given an IP address. If Telewest's servers can take up to 30 mins just to look up a few details in a database, grant an IP address over DHCP and send a small config file with TFTP speed issues are the least of our worries. n1, that answer for me why my modem takes so long to get an ip number when its been switched off a while. Even during the night. And Win Xp times out well before 30 mins and advises you to contact yr network admin Actually I see you work for BY support, BY afficionados will have no criticism of the it no matter what. |
Re: 10 Meg Problem With Motorola Modem
IGNITION..
sorry for taking so long to reply..just been a busy week.. Well havent looked there yet so no idea if he replied..he's proberly waiting to ask someone whats an OE and LD.. and nice to see you here as well... Hmm yep well the spec does say between not smack on but yep peeps will insisit on it being right on pls right on..I did hear that NTL'S modems wil run at 58 up to 60 ours wont..thats from a network guy who works for them... ok lets see what else hmm yessss.Mr monkey, the Telewest engin.. if you are a Telewest eng whatever, telling ppl not to accept anything but this modem or that well you should know the tec's have nooo control over what Modems or dhts they carry, and seeing as I have DP 100 STILL RUNNING FINE, must be a fluke...yep they should be removed from service and are not issued anymore...but then I belive in if it works and it does leave it the hell alone... as for sig levels.. nope your wrong the speck is between +3 and -7, but will run perfect at up to -11..just wont pass isa....will still run up to minus 15. but then again depends on the drop off at night..ideally in the perfect world below 48 above 30...the real world however trying to achive this all the time well aint gona happen yet... as for r00 well if its taking that amount of time to get an Ip addy then maybe you need a really good tec to find out why...even with the amount of traffic on the network no way should it take longer that a few mins... okies hopefull no one person is offended I would sooner get you all in one go and get the crap outa the way before the weekend..;).. Opp neally forgot nope ignition not you that makes me smile however send your pics over and Ill share with the lads at work, we need a new dart board...;) and yesss I'm joking honest... |
Re: 10 Meg Problem With Motorola Modem
JUSTAMIN,
i dont doubt that we have no control over stock (i personally hate being give pace DHTs at the mo lol their fault rates are astronomical), but if u recieve a dpx100 now the likelyhood is its a 2nd hand unit! the fault rate/return rate for those modems is much higher than any other! just speaking from experience thats all! i'm sure ur modem is fine and will continue to work fine. under -7 on the downstream - how often is the modem goin to lose its lock on the 331 and search all over again? its a matter of QOS more than whether it'll work or not. ok thats my 20cents now lol;) :D |
Re: 10 Meg Problem With Motorola Modem
As an ntl bod soon to be working alongside you gents could one of you please answer a couple of questions?
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I'm missing somthing obvious here, why should a peak in traffic which I'm guessing your referring to as peak times ie early evening onwards course a fluctuation in RF Levels? By channels I'm again guessing that your referring to the u/s ports on the uBRs? If so am I reading the posts correctly in that the config the modem recieves tells which port to log on to, seems an awful waste of possible bandwidth to me. Ours log onto any of the available ones in its group, which can number 3, 4, or 6 dependant on card type and RF segmentation. |
Re: 10 Meg Problem With Motorola Modem
okies MR monk,.lol. .well the modem depends more on upstream levels being right as for signals well thats ok on paper minus 7 but at -10 or even 11 will still work not lose its lock, hell mine worked for over 12 months on rg6 over 200 mts with 2 dhts and at - 12 never dropped because of sigs but upstream levels went to 53 then went slow, got the upstream down to 45 no probs... as for Pace , depends on where they come back from.. telford ouch... 4000 sa boxes that keep reseting, 4200 that won't hit in some areas.. when asked about my repeat rate being a little high due to those boxes last year and how to bring it down I said yep easy, I'll buy my own boxes that work and sell them to telewest..and sack the guy who should be looking after it.. for some reason it didnt go down to well nor did they take my offer up... but with a repeat rate of under 2 percent for most of the year not bad... .. Stu, yep when everyone turns everything on at night it can cause a drop in sigs...and because of ingress...same as the upstream will or can should I say change as well...now in a good area, with no probs this may not happen... so if your customer is close to the max and you leave it, well slow performance, slow channels change, slow internet, get the pic..?? as for channels on the modem well thats normally set, but sometimes the channel their on gets full hense change the channel, see if the reroute makes an improvement... PS.. wouldn't brag about being a tec here might get slated lol... one post called us all ermm not very nice names...;).. Okies the spelling on this post was correct at time of print, its MSN'S fault if it doesn't look right.. they do it to make blonds look clever...:angel:.... if your not happy with the post, or my answers or my work, I'm blond what do you expect!!!! and welcome to the mad house of ntl and telewest.. the new uniform is in stock complete with whistle..and a broom to sweep the leaves off the rails when were slack... hmm now Ive sent you all to sleep.. better go... |
Re: 10 Meg Problem With Motorola Modem
ok think of it this way - in a pc if u put 3 hardrives, a couple of CD-RW drives etc, floppy, all the gubbins and extras - then run a cpu and gpu intesive app running on it, the PSU is gonnna be put under heavy load and the 12volt rails are gonna fluctuate and most likely drop below 12v and not supply enough amperage.
ok now look at our network - if each house is a component, and they all switch on ur going to stress the PSU (tap in the pit, mux, yadda yadda, and all the way back to the headend). I know its a strenuous and simplistic comparison but it almost works lol. that kinda explains the RF drops. upstreams - basically if a channel is clogged then our modems do try for a different channel but if there aren't enough unclogged channels what you gonna do? lol any help? (ps for gods sakes dont work in london if you get the option lol get in round southend and basildon lol much nicer network :D ) ---------- Post added at 22:22 ---------- Previous post was at 22:05 ---------- lol 200 mts and a 3way splitter?! impressive hehehehe telford eh? i'll remember that ;) pace in my area is every1s worst nightmare lol no matter what it is 1000, 1010, 2000, 4000 lol. i've got 3 faulty on board from yesterday, 1 for every CATV install i had hehhehe. ahh the joys of stock control. lol |
Re: 10 Meg Problem With Motorola Modem
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---------- Post added at 23:09 ---------- Previous post was at 23:03 ---------- Quote:
1) Not really true, the customers don't need to have their devices on, the RF power will happily go down the drop cables whether the devices on the other end are switched on or not. The variations in signal over the course of time are due to ingress and environment not due to people plugging and unplugging things signals are split the same regardless. Unless of course you're suggesting that what people do on RF taps affects what other customers are seeing considering signal is split equally between them and terminated where there's nothing connected. 2) Not really true either, modems don't magically migrate to a less congested upstream, they'll take whatever the uBR offers them and only if the channel is congested to the point where they can't acknowledge the upstream and complete the process will they give up and take another upstream channel offer (suggest you read up on UCD advertisements in DOCSIS). |
Re: 10 Meg Problem With Motorola Modem
Even if what was said before was true, that would mean every customer has had everything turned on for over a year, not likely! The majority of phone calls to TW I discover that ALL the channels are at over 85%, and this has been pretty much like this in my area in Bristol for nearly a year now. From being a member on these forums I'm quite sure this isn't the only place affected like this, so anyone patronising us about everyone turning their taps or pcs on at the same time is really just taking the p!$$ with their eyes firmly shut. I think we'd be much more accepting if it was occaisional, but not every day. And if I did want to put 50 harddrives in my pc i'd buy a power supply powerful enough to support it!
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Re: 10 Meg Problem With Motorola Modem
The amount of ingress and Egress isn't going to change that drastically at peak times though? arnies don't fall off of taps at 5.30 then screw themselves back later on! as for the environment, at the moment the weather doesn't change dramatically enough for it to affect the levels at peak times.
With my basic knowledge of physic :erm: :dunce: cold weather will lower the resistance in the copper core of the cabling (lower temp = less atomic vibration = easier movment of electrons) so in theory *cough cough* levels should be better now that in summer. but also at this time of year there is a loooot of moisture which is never a good thing. and the upstream - modems do change upstream if the cant get a lock - you just said they do lol. |
Re: 10 Meg Problem With Motorola Modem
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The cabling isn't the main cause of environmental variance it's the amplifiers and the lasers, both tend to be more efficient in cooler weather and so deliver higher power which can be every bit as bad as low depending how network is running. Higher doesn't necessarily equal better. Some amps have temperature detection circuits which adjust gain to compensate for the weather. It's not a major issue in this country at this time of year however inside cabinets can get really hot in summer. You claimed that modems change on a clogged upstream, that's not necessarily true it has to be *really* clogged and not with normal traffic but modems trying to get a lock as there are dedicated slots provided as part of the upstream MAPs for UCD acknowledgement and for the unsolicited traffic that modems initially send to request a SID. Modems tend to be rather attached to upstreams and can take hours to give up on one if they do at all. Depending on segmentation they may not even have another upstream to choose from. |
Re: 10 Meg Problem With Motorola Modem
Hmm hate to admit but ignite boy is mostly right, however signals do drop when the load increases as and when ppl come home, same as if someone has dodgy equipment conected, and by that I dont mean funny boxes but anything from a faulty TV or video can knock out the entire street, or area... yep take that from a tec who spent 3 hrs when we worked on Sundays, called the network guys out and found 1 little old ladies TV was causing a buzzing noise on 50 phone lines.. or a guys video who only recorded after 7 pm for about 30 mins was interfering with the guy next doors TV.. ( that 1 was found by a guy who now works for NTL..) so its easy for someone to complain we didnt do this but if its working at the time we get there, where do we go ..? modems well yep they will stay where there told to be unless changed..BY can change it, on some modems we can, not really sure if they have a search bulit in.. but there again we are told 1 thing in training another when you say nope not my prob.. The TV drive well told on training we will NOT be fitting hdmi cables, the customer buys them and will have to fit them.. hmm the book says tecs will bring the cables and fit them.. no idea where I.m going with this but been a long week and as the best half went to bed, yes she keeps teling me she's the best, someone had to suffer so you all got it.. and ignite boy, as for the remark about hey bitch and warm office, you know that nice warm feeling you get in that chair in that nice office , yess, well I sent the dog to lift his leg on the chair.. thats why its soooo warm...;)............. and next time remeber your MY bitch...:D............. have a real good weekend guys/girls... |
Re: 10 Meg Problem With Motorola Modem
Meh so signals don't 'drop' just the ingress increases as I said above ;)
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Re: 10 Meg Problem With Motorola Modem
Sorry I've not rejoined this discussion sooner but unlike Ignition I got a life beyond the forum :p:
Much as it hurts :p: I got to agree with him here though, I just don't see how more people using the RF can make the carriers reduce in power. As we seem to be into dodgy comparisons ;) If 200 people are listening to Radio 1 everything is ok if 250 are listening then the signals poor? Sorry but RF doesn't work that way. Both the signal and the carrier can be affected by many things, distance from source, transmission medium, interference in many shapes & forms but not by capacity of usage. While Monkey maybe partially right with the temperature bit, Ignition may be as well. The problems there are generally related to the fact that the thermal AGCs are normally designed for the American market where everything hangs on poles. What they do is sense the increase or decrease in the temperature of the amplifier and then increase or decrease the RF level accordingly working on the basis that the attenuation of the cable is also increasing or decreasing. The problem though is that in the UK the majority of the cabling is in underground ducting so therefore is not affected by the weather. Hence you end up over or under driving your amplifiers which not only creates level fluctuations but also horrendous distortions. The majority of the franchises I've dealt with worked that one out in the early 90s. Please reassure me that the Telewest network is not overhead or that its not still using thermal AGCs incorrectly. Quote:
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Re: 10 Meg Problem With Motorola Modem
Ok first off Iâ₠¬ÃƒÆ’¢â€žÂ¢m no engineer, but youââ‚Âà ‚¬ÃƒÂ¢Ã¢â‚¬Å¾Ã‚¢re radio1 RF is kind of a totally different matter altogether.
Broadcast RF is nothing like RF through a cable. It's broadcast through the air. Ok letââ‚Âà ‚¬ÃƒÂ¢Ã¢â‚¬Å¾Ã‚¢s take that a step further, once the FM RF signal is is received by an aerial it is sent to a stereo. Fine but what happens if you add another, and another to the same aerial. The signal gets weaker, and youââ‚Âà ‚¬ÃƒÂ¢Ã¢â‚¬Å¾Ã‚¢re sound quality ends up crap. Just my 2 cents :D |
Re: 10 Meg Problem With Motorola Modem
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Re: 10 Meg Problem With Motorola Modem
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The point mate is that a cable network is made up of a combination of fibre and coaxial cable and designed in such a way that it doesn't matter whether 1 or 100 people are connected to it they'll all still receive the same level of signal that they were originally set up with baring a fault. It therefore becomes your transmitter, be that a radio station transmitter or a TV transmitter. Oh and by the way you'll find that when you get down to the basic RF and IF without the carriers you'll find there less difference than you think ;) Once we leave the street cabinet though its a whole different ball game, the cable from the cab to your house becomes your aerial and yes if you connect too many STB's, modems etc you will get problems with signal levels. hth |
Re: 10 Meg Problem With Motorola Modem
The power levels on your cable modem are excellant. What are you downloading at? I do not know of any sites that will let you download at 10MB. They will cap it for bandwidth reasons. Speedtests are useless so forget them. If you can download from an FTP site at 900KB upwards that is good.
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Re: 10 Meg Problem With Motorola Modem
err Hans what you mean his power levels are excellent.. wow you must not have looked at the upstream.. or have we suddenly changed it...
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Re: 10 Meg Problem With Motorola Modem
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That 5101e is 1 of the newer modems however there are alot of Sync failures in the logs. To be honest Just im guessing you are service tech so cable modems are your expertise. SO I could be wrong. I was 2nd line suport but now im in a proper IT job as a Novel network adminstrator. So PCs are my thing. |
Re: 10 Meg Problem With Motorola Modem
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The DOCSIS specs say 58dBmV, for QPSK, 55dBmV for 16QAM. Those are absolute max. Higher certainly isn't better, 42 is no worse than 52. Not sure what you're doing now but hope it isn't cable modem support. Read http://www.cablemodem.com for specifications, then give it some safety margin and you'll realise how crazy that is. |
Re: 10 Meg Problem With Motorola Modem
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Re: 10 Meg Problem With Motorola Modem
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I wonder how many people stuck at 58dBmV transmit power (Motorolas can't do 59) didn't have service from your belief that was 'excellent' :( Just FYI I don't work with DOCSIS at the moment either. Doesn't mean I can't remember anything about it. Love the way you got defensive then started giving a perhaps slightly exaggerated view of your resume, a simple 'ooops I was wrong' would have sufficed. |
Re: 10 Meg Problem With Motorola Modem
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Call Blueyonder 2nd line and ask them about pwr levels. The recommendations are handed down from network infrastucture. Yer know the guys who know what they are talking about. What is the deal with forums that when a new guy comes on with a bit of knowledge people have to be total obnoxious ******s? All you simply could of done was say I was incorrect and give a persuasive and intelligent discussion to why. Girls must love you. |
Re: 10 Meg Problem With Motorola Modem
Hanns IF you did do support for BY, and didnt roll a tec out for upstreams above 52 then no wonder we had so many complaints..
52 yep well that would pass but 56 or 59. hell they would be lucky to even get online.. and those figures were never, ever, I'l say that once again in case you don't get it, never ever ok.. not just NTL, but because the levels should be between 32 and 52... yep you can get away with 54.. but if it was the job would not be closed down.. when this first kicked off, I mean high speed inter.. the levels then were over 29 but below 50.. later changed to over 32 and the highest was 52.. not fiction fact... and I still have the training papers to prove it... did the course got the tee shirt....... O by the way you can still see on the network connections if that fault is there..try it and see.. I think its cus the guys there , well some of them dont have the card with that info on it..but thanks anyway... |
Re: 10 Meg Problem With Motorola Modem
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Personally I regard that as rather more difficult than administering a local area network, which is why DOCSIS people having read the website for half an hour get paid rather a lot more than internal network administrators. Quote:
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Girls, hey I don't do too badly, although I had to stop that when I got married :) ---------- Post added at 03:18 ---------- Previous post was at 03:12 ---------- Quote:
Just to refresh you removed reference to upstream transmit levels being 'Higher the better' and added a bit about how you 'could' be wrong. This topic I think is degenerating nicely and as Rashid hasn't been back here since his original post I have to feel it's served its' original purpose. |
Re: 10 Meg Problem With Motorola Modem
well mr ignite, yep hopefully he got sorted but this has been fun.. but now I can see why so many are a little erm fed up with some at BY tec support.. I have only had 1 guy from 2nd line who was a pratt the rest don't seem to bad.. 1st line well not allowed to put my thoughts in print... as for Hanns well I belive he worked for a support group, prob contracted to BY... o well never mind someone had to do it... on another point, Mr Zolton well think I met him and he suddenly had to rush off... keep up the good work guys.. |
Re: 10 Meg Problem With Motorola Modem
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