| [Connectivity] Xfinity SMCD3GNV - Lost MDD Timeout/Sync Timing F This is a typical log from my router.When I use my Laptop upstairs I can't keep a wireless connection, have to use ethernet.The laptop that is used downstairs (same floor as router) also has disconnect problems so it isn't ethernet.
I am in a one ISP neighborhood.The wireless connections i pick up from other houses barely get 3 bars.Bought a router for upstairs, it stayed connected longer with a 5 bar signal but even that would disconnect.
The router has to go through the walls to get from the 1st floor to the second.So I can't exactly move it.
Any way to tell if its a "my end" problem or an isp problem looking at the logs?
Lost MDD Timeout;CM-MAC=00:26:f3:51:76:f0;CMTS-MAC=00:01:5c:24:29:d5;CM-QOS=1.1;CM-VER=3.0; SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=00:26:f3:51:76:f0;CMTS-MAC=00:01:5c:24:29:d5;CM-QOS=1.1;CM-VER=3.0; Lost MDD Timeout;CM-MAC=00:26:f3:51:76:f0;CMTS-MAC=00:01:5c:24:29:d5;CM-QOS=1.1;CM-VER=3.0; SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=00:26:f3:51:76:f0;CMTS-MAC=00:01:5c:24:29:d5;CM-QOS=1.1;CM-VER=3.0; |
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 gar187erI do this for a living
join:2006-06-24
Dover, DE
kudos:4 | Re: [Connectivity] Xfinity SMCD3GNV - Lost MDD Timeout/Sync Timi loss of sync has nothing to do with your wireless connection....if your wired works fine, then you have a range/signal quality issue with your wireless broadcast.
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I'm better than you! |
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| reply to BluffingJ
That looks like a modem log, not a router log.
What router are you using ? How many sq feet is your home ? What channel is your router using ?
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»www.VAJeeps.com |
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| reply to BluffingJ
As it says in the topic I am using Comcast Xfinity SMCD3GNV.
The channel is set to the default which looks to be 6, the other choices are 1 or 11.
Not sure of square footage, though if disconnects happen on both floors of house would that matter as much? |
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| Oh didn't even notice that. Try changing channels. You may need to see if you can put it in bridge mode and buy a REAL router.
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»www.VAJeeps.com |
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| reply to BluffingJ
Also, what are your signal levels ?
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»www.VAJeeps.com |
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| reply to BluffingJ
Tried Belkin router for upstairs and connecting ethernet to it upstairs, had a better signal but would still disconnect on occasion.
The only channel options are 1,6 and 11.The wii responds to some better than others but cant recall off the top of head which.
Does the below tell me anything in terms of diagnosis, or is it something i should ignore?
Downstream Channel Bonding Value
Index 1 2 3 4
Lock Status Locked Locked Locked Locked
Frequency 555.001 MHz 567.000 MHz 573.001 MHz 597.001 MHz
SNR 35.780 dB 35.973 dB 36.844 dB 37.093 dB
Power 6.655 dBmV 7.541 dBmV 6.757 dBmV 8.728 dBmV
Modulation 256 QAM 256 QAM 256 QAM 256 QAM
Upstream Channel Bonding Value
Index 1 2 3 4
Lock Status Locked Not locked Not locked Locked
Frequency 27899459 Hz 34799170 Hz
Symbol Rate 5120 KSym/sec 5120 KSym/sec
Power Level 44.0000 dBmV 44.2500 dBmV
Modulation 64QAM 64QAM
Channel ID 8 7 |
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| Signals aren't terrible.
Have you called Comcast and asked about getting your modem switched out ?
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»www.VAJeeps.com |
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| reply to BluffingJ
If we are talking wireless signals on laptop I get anywhere from 2 to 4 if the sun is shininig.Though typically it is 2 to 3.
Since this is essentially a growing 1 isp neighborhood is there a chance channel overload may come into play, or do my drops indicate otherwise?
Havent called anyone to look at it. |
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| No, not worried about wireless signal.
You have 4 bonded channels down and two up. Congestion is VERY unlikely, especially with a D3 modem.
I would call Comcast and get them to switch out your modem as your signals look fine. If that doesn't help, get them to put it in bridge mode (assuming that model has that) and hook up a router the correct way.
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»www.VAJeeps.com |
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| reply to BluffingJ
Just checked on inSSIDer
My RSSI is anywhere from -74 to -81 changing by second (so fair/borderline good)
My channel is 6+10 there is 1 channel 10+6 with 3 just 6 and 1 just 10 (cant choose 10 in router).There are 5 channel 11's 3 channel 1s.
Doesn't seem to be any mention of bridge mode in router settings. |
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| Bridge mode is something they have to do via tech support I believe.
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»www.VAJeeps.com |
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| reply to BluffingJ
Is there a way to tell for sure whether it is a "my end" or "isp end"?
I tried a Belkin router upstairs, and it disconected but not as much as the xfinity.If even that is disconnecting would bridging the downstairs one do anything, since presumably the problem wouldnt be fixed? or is bridging different than connecting to a different router? |
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| I'm not sure how you're using a Belkin router without first putting your Comcast router/modem in bridge mode. You MUST call Comcast to use your own router.
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»www.VAJeeps.com |
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| reply to BluffingJ
I simply connected the ethernet from the wall to the router.The wireless connection came up and i was able to connect to it. |
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| I know HOW... My point is it's not that simple when the SMCD3GNV is the modem/router already. MUST be in bridge mode. Call Comcast.
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»www.VAJeeps.com |
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 EGThe wings of lovePremium
join:2006-11-18
Union, NJ
kudos:9 | FWIW, a double NAT condition (cascading two routing devices) will work, but it is not desirable as it will complicate one's LAN / home network configurations when it comes to port forwarding and may actually break the connectivity of some apps such a VPN. |
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| reply to BluffingJ
I have already returned that router, so that's irrelevant.As is, it would still be the same connection right?Which means no problem is fixed except the router changed.If it is a signal issue,coax cable or otherwise, wouldn't that still be there because it is infact the same signal? |
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| You need to call Comcast and have a tech come out. Make sure to tell them you may need your modem replaced so the tech has one on hand.
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»www.VAJeeps.com |
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| reply to BluffingJ
said by BluffingJ:I have already returned that router, so that's irrelevant.As is, it would still be the same connection right?Which means no problem is fixed except the router changed.If it is a signal issue,coax cable or otherwise, wouldn't that still be there because it is infact the same signal?
physical connections maybe the same but it's the configuration / settings within the modem and router that will help you figure out if it's the router that's dropping the signal or the modem.
the SMC is a modem and router in one, so when you added that router it created a double NAT which is not desirable and may not work properly network wise. it's not as easy as just connecting a belkin wireless router to that SMC.
what I did with mine was to connect 2 wireless router acting as access points, that way I get good coverage in any corner of the house and even outside.
and that Wii console is better off on a hardwire connection...I had mine on a wireless connection before and it sucked...bought a usb/ethernet connector for wii and boom...problem fixed. |
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