patcat88
join:2002-04-05
Jamaica, NY
kudos:1 | edge routers doing speed control I think that this is basically that they open the whole DOCSIS channel to each cable modem, for example, if its 2 am and barly anyone is online, your line can burst upto the max of the channel (30mbs qam64, 38 qam256) if nobody else is using it at the moment. I guess the cable modems have no download caps, and the download speeds are channel speed/users (ethernet style) or controlled by routers at headend rather than Cable modem config files. I dont know the capabilities of cable modem config files, so it may be possible that this is all implimented in config files and headend routers QOS mark the packets to use "spare" bandwidth. |
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Reviews:
 ·Comcast
| Edge routers are part of the CMTS, and during off-peak periods (when demand is lowest), bandwidth allotments per router (and thus per node) are often increased (this is automatic, and not something that is turned on or off at the NOCs). During peak usage times is often the *only* time when modem configuration files take priority, and even then only when node saturation (one hundred and ten percent of peak bandwidth) occurs. The *other* use for modem configuration files is to separate specific options that may be available only to a particular speed tier (Game Invasion, for example). |
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patcat88
join:2002-04-05
Jamaica, NY
kudos:1
1 edit | Its irrelavent what bandwidth is going to the node. At 2AM my 8/512 (RR prem) and 15/2 (OOL) is the same speed as at 4pm and 8pm in the afternoon. The cable modem caps are enforeced regardless of load on the node, I think comcast wants to basically set it so that caps are enforced only when the node is 100% used and other times let the people use the node to its limit, remmeber if bandwidth isnt utilized that particular second, its lost. |
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