What is a decent DOCSIS3.0 modem with WiFi?

Discussion in 'Wireless Internet' started by D. F. Manno, Jul 12, 2015.

  1. By "modem", I mean just the bridge between the cable network and the
    ethernet connection usually going to a router. You're referring to
    what Comcast calls a "gateway", which conglomerates a modem, router,
    wi-fi, ethernet switch, and an optional telephone VoIP device into one

    Comcast maintains strict control over the modem section, but has no
    reason to limit your access to the router, wi-fi, etc which you can
    configure and control. When you connect to, you'll find
    all these configuration and control settings, but if you dive into the
    cable modem section, all you'll find is status and diagnostics.
    Jeff Liebermann, Jul 12, 2015
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  2. D. F. Manno

    The Real Bev Guest

    You can probably haggle the 'promotional' price for at least another
    year. We got promotional prices from Charter for several years, but
    they finally refused to haggle back to the previous price -- they WOULD
    give us the current promotional price, though -- $39/month rather than
    $49. I hate to have to keep calling and threatening to quit.

    71.89 Mbps down
    4.18 Mbps up
    The Real Bev, Jul 12, 2015
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  3. That depends on the speed that you're expecting and paying for.
    There are maximum data rates. Actual data throughput will be
    less due to physical layer overhead (error correction coding, burst
    preamble, and guard interval) as well as TCP/IP packet overhead. I
    don't have the number handy, but my guess(tm) is the actual maximum
    throughput will be about 70% of the maximum data rate. So, your
    SB6121 should be good up to about 120 Mbits/sec download speed.

    Download Upload
    ch Mbit/sec ch Mbits/sec
    SB6121 4 172 4 131
    SB6141 8 343 4 131
    SB6183 16 686 4 131
    Jeff Liebermann, Jul 12, 2015
  4. D. F. Manno

    D. F. Manno Guest

    Since I'm unfamiliar with the location, is it still true
    that only one company generally serves cable at any one
    D. F. Manno, Jul 12, 2015
  5. D. F. Manno

    D. F. Manno Guest

    I think it's a crime that I paid a sales tax on the Ooma device,
    which makes sense, but then I pay tax on the use of the device
    (which makes no sense).

    I don't care about 911 (that's why I kept inputting zip codes until
    I found a cheap one) and that's where it's registered so I pay the
    tax for some county in Kansas as I recall.

    How they get away with charging tax just for the use of a device (whether
    or not you even use it) makes no sense to me from a "logic" standpoint.
    D. F. Manno, Jul 12, 2015
  6. D. F. Manno

    Guest Guest

    it is *extremely* rare for there to be more than one company offering
    cable service, which is why they don't give a shit about offering a
    quality service.
    Guest, Jul 12, 2015
  7. In general, yes. It's true of where I live.

    In fact, the only high-speed internet services I can get are Cox and
    Satellite. There's no DSL, Uverse, etc., available in my subdivision.
    Michelle Steiner, Jul 12, 2015
  8. Generally true. Municipalities grant franchises to cable providers,
    usually in trade for various service and monetary concessions.

    However, there are a few areas where the incumbent service was so bad,
    that an alternative provider became a possibility. These are called
    "overbuilders". The most prominent are WOW, RCN, and Google Fiber:
    Jeff Liebermann, Jul 12, 2015
  9. D. F. Manno

    Stan Bischof Guest

    Sounds like the Gore tax. Thank your buddy Al for that one.

    As for making sense- exactly when does anyone expect the government to
    "make sense"?

    Stan Bischof, Jul 13, 2015
  10. D. F. Manno

    Lewis Guest

    Lewis, Jul 13, 2015
  11. D. F. Manno

    D. F. Manno Guest

    Based on the advice here, I think I'll buy the Costco modem that
    Jeff suggested, and then a normal router, and that should set them
    up (for about $150).

    D. F. Manno, Jul 13, 2015
  12. Really? I have about a dozen customers and friends that own their own
    Comcast modems. I've handled outages for them a few times and never
    had the phone support person specifically blame the customer owned
    equipment. They can see the same numbers for signal levels and SNR
    that you can see at and can tell if there's a problem
    with the line, the drop, or the modem. In other words, they can tell
    if there's a problem on your premises, which is quite common. If the
    modem checks out ok with a remote diagnostic and reboot, they may
    suggest that you plug your computer directly into the modem to
    eliminate problems caused by house wiring, router, wireless, etc. If
    that works, the problem is with your equipment. Even if support
    cannot "see" the modem, they will ask what the lights on the modem are
    doing in an effort to determine if it's a line or modem problem.
    Oddly, it never occurs to many people (including me) to check if the
    TV signal is working on the cable to determine if there's a line or
    drop problem. That happened a few weeks ago at one customers, where
    mice had chewed through the coax trying to get into the house.
    Jeff Liebermann, Jul 13, 2015
  13. Make sure that it's a dual band router. If y'er son is living in
    student housing, the 2.4GHz band is very crowded and prone to
    interference problems. 5GHz is much wider and less crowded.

    The new Mac's are all coming with 802.11ac modems. You should
    probably get a matching router. The speed between the Mac and the
    wireless router will be blazingly fast, but will do nothing if the
    cable modem speed is throttled by the service provider. However,
    there's a benefit to going fast over the air. By occupying less "air
    time", the probability of having a packet clobbered by interference is
    less. Or, by cramming more data into the same amount of air time, you
    transmit less. That also allows more users on the channel.

    Good luck.
    Jeff Liebermann, Jul 13, 2015
  14. D. F. Manno

    Guest Guest

    as well as transfers between machines on the same lan, which at a
    school, is something that will happen, a lot. sometimes even for
    legitimate purposes.
    Guest, Jul 13, 2015
  15. D. F. Manno

    The Real Bev Guest

    At some point they were no longer able to grant monopolies, but it's a
    lot more expensive to lay cable now than it was 30 years ago so they're
    still effective monopolies. AT&T had landlines everywhere, so they're
    generally one option, and one cable company is generally the other.

    Lots of wireless carriers if there are enough people to make it pay.
    The Real Bev, Jul 13, 2015
  16. D. F. Manno

    The Real Bev Guest

    The Feds etc. charge connection fees, which ooma passes on to us. The
    fact that the feds make us pay this 'universal connection' fee is
    outrageous, but it's not ooma's fault -- everybody who provides you
    phone services has to pay it.
    AT&T wanted to charge me $3/month for long distance service even if I
    made NO LD calls (the case for a couple of years). We had to
    deliberately cancel LD service with them, and the price of ordinary
    landline service just kept increasing. When it hit $30+ we switched to
    ooma and never looked back.

    AT&T used to be respectable people. Now they're just cheesy.
    The Real Bev, Jul 13, 2015
  17. D. F. Manno

    tlvp Guest

    Bev (or, anyone else), do you have experience sending or receiving fax
    through Ooma/internet style telephony gear? Will standard MFP devices work
    well on an Ooma line? Otherwise, what could be reasonable work-arounds?

    Thanks. Cheers, -- tlvp
    tlvp, Jul 13, 2015
  18. D. F. Manno

    Guest Guest

    i use an epson multifunction printer plugged into an ata and it works
    great. be sure everything supports fax over voip (i forget the official
    protocol name).
    Guest, Jul 13, 2015
  19. D. F. Manno

    tlvp Guest

    No State sales tax in: Alaska, Delaware, Montana, New Hampshire, Oregon.
    HTH. Cheers, -- tlvp
    tlvp, Jul 13, 2015
  20. D. F. Manno

    tlvp Guest

    And they're happy to sell you off to the highest bidder -- our POTS and DSL
    services got sold off to Frontier less than a year ago, and all the at&t
    wireline real estate and service vans in this town have been painted over
    with Frontier artwork (meanwhile AT&T Wireless is still AT&T).

    Of course, Verizon has (reportedly) been doing much the same thing.

    Cheers, -- tlvp
    tlvp, Jul 13, 2015
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