| [Connectivity] Multiple Comcast modems In the house I currently reside in there's already one Comcast internet connection. I was looking to add a second line for my own use (Sharing isnt an option in this case) and it looks like its entirely possible. My question however, has to do with degradation in speed if one of the lines gets saturated; will the other line suffer as well? |
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 NetFixerFreedom is NOT freePremium
join:2004-06-24
The 'Boro
 ·Vonage
 ·Cingular Wireless
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| said by ykram:In the house I currently reside in there's already one Comcast internet connection. I was looking to add a second line for my own use (Sharing isnt an option in this case) and it looks like its entirely possible. My question however, has to do with degradation in speed if one of the lines gets saturated; will the other line suffer as well?
Assuming that the house cabling is up to standards and both modems have acceptable signal levels, it would be no different than if your next door neighbor was a bandwidth hog. And if you are in a DOCSIS 3 area, and you have a D3 modem, it is becoming more difficult for a bandwidth hog to have any measurable effect on others in their neighborhood. In my area, before DOCSIS 3 was implemented, prime time speed would sometimes drop so low that Bill and Karolyn Slowsky would have loved it, and real time applicatons such as VoIP were impossible. Since DOCSIS 3, I have never seen my speed drop below my speed tier, and my Vonage VoIP service is perfect.
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History does not long entrust the care of freedom to the weak or the timid.
-- Dwight D. Eisenhower |
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 NightfallMy Goal Is To Deny YoursPremium,MVM
join:2001-08-03
Grand Rapids, MI
 ·Site5.com
·Comcast
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| said by NetFixer:said by ykram:In the house I currently reside in there's already one Comcast internet connection. I was looking to add a second line for my own use (Sharing isnt an option in this case) and it looks like its entirely possible. My question however, has to do with degradation in speed if one of the lines gets saturated; will the other line suffer as well?
Assuming that the house cabling is up to standards and both modems have acceptable signal levels, it would be no different than if your next door neighbor was a bandwidth hog. And if you are in a DOCSIS 3 area, and you have a D3 modem, it is becoming more difficult for a bandwidth hog to have any measurable effect on others in their neighborhood. In my area, before DOCSIS 3 was implemented, prime time speed would sometimes drop so low that Bill and Karolyn Slowsky would have loved it, and real time applicatons such as VoIP were impossible. Since DOCSIS 3, I have never seen my speed drop below my speed tier, and my Vonage VoIP service is perfect. I agree with NetFixer.
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My domain - Nightfall.net |
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| reply to ykram
It won't effect your speeds, the billing is where you will have the issues, I don't think Comcast has "add a modem", and I think Comcast will have a bill for each line. |
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Mr Matt
join:2008-01-29
Eustis, FL
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1 edit | reply to ykram
ykram; Please advise why sharing is not an option? I helped two acquaintances resolve the same issue. One acquaintance had two modems already installed. They both thought the broadband connection was like a telephone line, one call at a time.
I had them return the second modem. I installed a four port wired router and a home plug adapter at the location where the modem was installed. The modem was connected to the router WAN port, the nearby computer to one router port and the home plug adapter to the other router port. The other computer was connected to another homeplug adapter at the same outlet the computer was plugged into. The homeplug system transmits data over the home power circuits.
I forgot to mention unless you can cut a deal you will probably be charged to broadband access fees.
In case number two the acquaintance was anticipating installing a second modem. They had two desktops in different locations and a laptop that had no internet access. I had them acquire a wireless router which we located where the modem and associated computer was installed. At the other desktop we installed a wireless USB Adapter and at the laptop we installed a PCMCIA adapter card. All computers had simultaneous access to the internet.
In both cases they were very satisfied with the results.
I forgot to mention that unless you can cut a deal you will probably be charged two broadband access fees if you install two modems. |
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| Due to the way the rent is laid out (and the requirements I have for my work), we need to do separate lines. Two fees are fine as my roommate would be billed for his line (which he already pays for himself) and I'm fine with paying for my own as well.  |
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 EGThe wings of lovePremium
join:2006-11-18
Union, NJ
kudos:9 | reply to ykram
So now it all depends on your particular local market area's policy. Some areas are "one address, one modem". Best to call and check the local policy. |
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 gar187erI do this for a living
join:2006-06-24
Dover, DE
kudos:1 | said by EG:So now it all depends on your particular local market area's policy. Some areas are "one address, one modem". Best to call and check the local policy.
even if that were the case, one thing that i have supercede ANY policy is adding a business account....if you add business class hsi to your address, the company will bend over backwards to get you to sign a contract.....ive seen $8,000 worth of plant built for a 2 year contract that was cancelled after a few months.....
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I'm better than you! |
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| reply to EG
1 modem for internet per account. The house can have as many accounts as you have outlets that'll support and signal strength but they will all be billed separately and have different IPs.
I say "1 modem for internet" because there are homes with an eMTA and a modem. Bootfile is on the modem for internet and eMTA is walledgarden. |
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EGThe wings of lovePremium
join:2006-11-18
Union, NJ
kudos:9 | O/k |
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| I've run 3 modems at the same time, no speed difference. |
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 IowaCowboyPremium
join:2010-10-16
Indian Orchard, MA
·Verizon Broadban..
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| reply to ykram
Just upgrade to a faster speed, add a router, and split the cost of the internet connection with your roommate. If you use the connection for work, then you MUST have business class as the AUP on residential HSI permits use of the connection for personal non-commercial use only. Like others said that Comcast will only provision one modem per service address.
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All of my CPE (including my EMTA) is customer owned. The only Comcast owned equipment in my house is the CableCards in the two TiVO boxes I own. |
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NetFixerFreedom is NOT freePremium
join:2004-06-24
The 'Boro Reviews:
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2 edits | said by IowaCowboy:Just upgrade to a faster speed, add a router, and split the cost of the internet connection with your roommate. If you use the connection for work, then you MUST have business class as the AUP on residential HSI permits use of the connection for personal non-commercial use only. Like others said that Comcast will only provision one modem per service address.
The one modem per address rule is likely a local franchise rule, and it does not necessarily apply universally (and multiple posters in this forum have claimed to have multiple modems at the same address). However, since business class service is being discussed, I doubt that it would be a problem if the roommate kept the residential service, and the OP got business class service at the same address (even on the same coax drop).
I have Xfinity residential TV service in my own name, and I have Comcast business class internet service using a DBA name. Both services come in on the same coax drop, but they are totally separate accounts...Xfinity does not know or care that I have Comcast Business Class internet service, and Comcast Business Class does not officially know that I have Xfinity residential TV service (the Comcast Business Class salesperson knew because I asked if I needed to convert my TV service to Business Class), but they are two totally separate accounts that are in no way connected as far as Comcast and Xfinity are concerned. FWIW, I continue to get spam and junk mail from Xfinity inviting me to sign up for Xfinity residential class HSI, and residential class CDV, and I have no doubt that should I decide to do so, I could get it.
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History does not long entrust the care of freedom to the weak or the timid.
-- Dwight D. Eisenhower |
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| reply to ykram
Could we just use a splitter to connect the two cable modems + have them work at the same time? |
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| Yes, they have to be both activated ofc. As i've said, I've run 3 modems on commy all connected through a powered splitter. A single -3.5db splitter is fine for 2 modems, for 3 you'd have -7.5 which is too much which is why I needed a powered one. |
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 tshirtPremium,MVM
join:2004-07-11
Snohomish, WA
kudos:3
·Comcast
| reply to ykram
said by ykram:Could we just use a splitter to connect the two cable modems + have them work at the same time?
That would depend on the signal levels.
If you post your current levels we can calculate if it would (most likely) work with a splitter. |
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| reply to ykram
All 4 downstreams have a signal to noise ratio of 37 dB. Power Level 9dBmV and 8dBmV for the most part.
Upstream 37 dBmV |
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