| reply to iansltx
Re: Speed/Price List? we got 6/1 for $199 back in 06 on a 3 year deal. /26 was an extra $50 for a total of $249. They wont do more than a /26 on coax, and their fiber pricing was pretty nuts (At least for us). |
|
iansltx
join:2007-02-19
Golden, CO
kudos:2 | Any idea of what residential pricing is? |
|
| reply to cooldude9919
yeah, around here their fiber pricing is $150/syncronus megabit, and you pay the install costs of running the fiber from the nearest fiber access node either up front, or monthly throughout your contract. I checked into it and the 1.5/1.5 would be 800/month for us for 3 years. We can get a t-1 for less than $300. |
|
iansltx
join:2007-02-19
Golden, CO
kudos:2 | How much is regular cable biz broadband though? |
|
| The reason you are getting only 10 megs upload on a node is because your using qpsk. It's a more robust transmission i.e. it can handle interference a lot better than 256 qam however it is less efficient, thus the increase in transmission rate. |
|
iansltx
join:2007-02-19
Golden, CO
kudos:2 | Aaaaand QPSK is because the system is DOCSIS 1.1. My signal levels are fine so if the system had DOCSIS 2.0 it'd be showing.
Also, around here Suddenlink is using 561MHz for the downstream DOCSIS channel being used here. |
|
1 edit | Modulation: DOCSIS 1.0/1.1/2.0 specifies that 64-level or 256-level QAM (64-QAM or 256-QAM) be used for modulation of downstream data, and QPSK or 16-level QAM (16-QAM) be used for upstream modulation. DOCSIS 2.0 specifies 32-QAM, 64-QAM and 128-QAM also be available for upstream use.
MAC layer DOCSIS employs a mixture of deterministic access methods, specifically TDMA for DOCSIS 1.0/1.1 and both TDMA and S-CDMA for DOCSIS 2.0, with a limited use of contention for bandwidth requests. In contrast to the pure contention-based MAC CSMA/CD employed in older Ethernet systems (there is no contention in switched Ethernet), DOCSIS systems experience few collisions. For DOCSIS 1.1 and above the MAC layer also includes extensive Quality of Service (QoS) features that help to efficiently support applications, for example Voice over IP, that have specific traffic requirements, such as low latency.
All of these features combined enable a total upstream throughput of 30.72 Mbit/s per channel (although the upstream speed in DOCSIS 1.0 and 1.1 is limited to 10.24 Mbit/s). All three versions of the DOCSIS standard support a downstream throughput of up to 42.88 Mbit/s per channel with 256-QAM
Yes you are right docsis 1 specifies that qpsk be used for the upstream. But notice with docsis 2.0 and above, higher qam rates are used. And as mentioned all that combined allows for more upstream bandwidth. So that proves my point that qam rates DO have an affect on bandwidth which is the opposite of what your arguing.
»www.pace.com/media/americas/pdf/···fits.pdf
heres an article that explains it in depth. |
|
