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It's expensive because it's dedicated bandwidth, not shared, has a SLA, which your residential connection doesn't, and comes with static IP's. They also put yo

by Alupis 7y ago

It's expensive because it's dedicated bandwidth, not shared, has a SLA, which your residential connection doesn't, and comes with static IP's. They also put your house on a difference circuit from everyone else in your neighborhood, which has a cost - which explains the ETF if you move away. In your case, perhaps it's cheaper to get a $2.50/month VPS from Vultr instead of paying all these fees? You get a static IP to, and don't have to play DynamicDNS games.

superkuh 7y ago
Are you sure about that? It doesn't fit what I understand and I've talked to a friend who works for Comcast and he says the only difference is the customer support. The rep I talked to and the price I gave $156/mo does not include a static IP. That was something like $10/mo more. Sure, the firmware they tftp to my modem will be different but it's not giving me dedicated RF bandwidth on the exact same RF hardware path that existed before I got the firmware. It's the same uplink channels. This can be confirmed by using a splitter, attenuator, and looking at the RF signals directly in the frequency domain over time with an with a software defined radio (see: http://superkuh.com/pictures/docsis3_cable_ziggo_2017-10-08-full-spectrum.jpg http://superkuh.com/pictures/docsis3_cable_ziggo_2017-10-08-...).
- Alupis 7y ago
  It's definitely different circuits, and you definitely get dedicated bandwidth. You won't burst anymore either (a thing you get with shared lines), but you'll get 100% of your allocated bandwidth all the time, even if you peg it out 24/7. You can do a traceroute and see the reverse-dns names of the hops you go through too. Also remember, TCP has 8Mb of overhead per 100Mb, so you'll get maximum theoretical speed of 92Mbps on a 100Mbps line.
  - Dylan16807 7y ago
    > TCP has 8Mb of overhead per 100Mb So to reach that number, I guess you're talking about 60 bytes of headers for each 1500 byte data packet, then again for an ACK packet? That's partly or entirely wrong in multiple ways. First, the combined IP+TCP header is only that big for IPv6 connections. Second, under general circumstances an ACK is only sent for every other packet, halving that bandwidth. Third, that 100Mb is going to be for one direction, so the ACK traffic going the other way doesn't affect it at all. Typical overhead is generally 3%, not 8%.
neoromantique 7y ago
Jesus, I live in Europe and reading this thread is absolutely insane, I have gig up/down for less than 20€/mo, no commitment and no data caps of any sort. It's absolutely insane reading about how bad the ISPs in US treat clients.
jschwartzi 7y ago
No Comcast’s business service doesn’t have an SLA and it’s impossible for it to be dedicated because of the TDMA scheme used on the cable itself. It’s expensive because people will pay it because they have no other options. I had to shop for internet in my office and it ended up costing more for 75mbit than it was costing me at home for gigabit. My only other option was to buy 4 DSL lines to make 24mbit for the same price. If you operate at a business address everything just becomes more expensive because you’re a business.

by Alupis 7y ago

superkuh 7y ago

Are you sure about that? It doesn't fit what I understand and I've talked to a friend who works for Comcast and he says the only difference is the customer support. The rep I talked to and the price I gave $156/mo does not include a static IP. That was something like $10/mo more. Sure, the firmware they tftp to my modem will be different but it's not giving me dedicated RF bandwidth on the exact same RF hardware path that existed before I got the firmware. It's the same uplink channels. This can be confirmed by using a splitter, attenuator, and looking at the RF signals directly in the frequency domain over time with an with a software defined radio (see: http://superkuh.com/pictures/docsis3_cable_ziggo_2017-10-08-full-spectrum.jpg http://superkuh.com/pictures/docsis3_cable_ziggo_2017-10-08-...).

Alupis 7y ago
It's definitely different circuits, and you definitely get dedicated bandwidth. You won't burst anymore either (a thing you get with shared lines), but you'll get 100% of your allocated bandwidth all the time, even if you peg it out 24/7. You can do a traceroute and see the reverse-dns names of the hops you go through too. Also remember, TCP has 8Mb of overhead per 100Mb, so you'll get maximum theoretical speed of 92Mbps on a 100Mbps line.
- Dylan16807 7y ago
  > TCP has 8Mb of overhead per 100Mb So to reach that number, I guess you're talking about 60 bytes of headers for each 1500 byte data packet, then again for an ACK packet? That's partly or entirely wrong in multiple ways. First, the combined IP+TCP header is only that big for IPv6 connections. Second, under general circumstances an ACK is only sent for every other packet, halving that bandwidth. Third, that 100Mb is going to be for one direction, so the ACK traffic going the other way doesn't affect it at all. Typical overhead is generally 3%, not 8%.

neoromantique 7y ago

Jesus, I live in Europe and reading this thread is absolutely insane, I have gig up/down for less than 20€/mo, no commitment and no data caps of any sort. It's absolutely insane reading about how bad the ISPs in US treat clients.

jschwartzi 7y ago

No Comcast’s business service doesn’t have an SLA and it’s impossible for it to be dedicated because of the TDMA scheme used on the cable itself. It’s expensive because people will pay it because they have no other options. I had to shop for internet in my office and it ended up costing more for 75mbit than it was costing me at home for gigabit. My only other option was to buy 4 DSL lines to make 24mbit for the same price. If you operate at a business address everything just becomes more expensive because you’re a business.