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Old 05-16-2012, 08:06 PM   #1
Rincewind1
 
Join Date: Feb 2006
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What are T3s?

Hi everyone,

I'm having terrible connection issues with my cable internet. I talked to tech support today and they told me that they are seeing a high volume of T3s from my modem (78 in 52 minutes) and told that normal is 1 or less a day. These are apparently causing my 10 mbps connection to slip down to 1-5 constantly.

I just want to know more about what a T3 is and if there is anything I can do to reduce the volume until the service tech gets here on Friday. I'm trying to play Diablo 3 with my brother this week but my connection issues, coupled with Blizzard's failure at being prepared for a high connection volume, have made the game unplayable.

I've tried googling about it but all I can find are links for high-speed T3 internet connections.
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Old 05-16-2012, 08:11 PM   #2
damaged
 
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Quote:
Basically a cable modem gets online this way:

The modem scans for a digital QAM channel (which can be digital TV or modem downstream channels) and "listens" for upstream channel descriptor (UCD) information on it (which is only found on modem downstream channels). If it doesn't get the UCD after a few seconds of receiving data on that channel, a T1 timeout occurs and the modem looks for another digital QAM channel.

Once the modem finds the correct downstream channel and receives the upstream channel descriptor, it then waits for its initial opportunity to "talk" to the CMTS. If it doesn't get that chance within 12 seconds, a T2 timeout occurs.

So during initial modem connections, T1 and T2 timeouts are perfectly normal to see in the modem logs.

After locating a downstream data carrier channel, the modem gets its chance to "talk" to the CMTS and sends data to negotiate the proper upstream signal levels and timing. This negotiation process takes several data exchanges between the cable modem and the CMTS. If at any point the modem doesn't receive a response from the CMTS within about 200 milliseconds, a T3 timeout occurs. Several T3s have to occur before a modem resets.

The modem then goes through the DHCP, TFTP, TOD processes and once all are completed the modem is online.

Once the modem is online, the CMTS sends "Periodic Ranging" or keep-alive requests to it every 30 seconds. If the modem doesn't receive one, a T4 timeout occurs. Once 16 of the T4 timeouts have to occurred, a modem resets.

If there is a downstream communication problem, the cable modem might not receive these "keep-alive requests". If the upstream utilization is too high, or too many modems are connected to the same upstream port, it is possible that some modems will not get the required bandwidth or transmit opportunities to respond to the keep-alive requests. Either of these issues can result in T3 or T4 timeouts occurring.
Source: http://www.dslreports.com/faq/8560
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Old 05-16-2012, 08:28 PM   #3
Rincewind1
 
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Thank you, that is exactly what I was looking for.
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Old 05-16-2012, 08:31 PM   #4
damaged
 
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Originally Posted by Rincewind1 View Post
Thank you, that is exactly what I was looking for.
No problem, hope things work out for you.
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