Only getting 250ish Mbps with 343Mbps Modem why ??

Discussion in 'Networking & Security' started by Subzerok11, Apr 14, 2019.

  1. Subzerok11

    Subzerok11 Gawd

    Aug 13, 2014
    I have a Arris SB6141 which is rated at 343Mbps. This is happening with and without the router by the way. The ethernet cable is a Cat5e that's 6 foot long. My router is a ASUS RT-N66U Gigabit Router, both of the these items are only 2-3 years old. The only thing that changed was my Spectrum internet plan went from 100/10 to 400/20. I know I shouldn't expect 400Mbps with the modem but I should at least get in the low 300's right ?
  2. BlueLineSwinger

    BlueLineSwinger Gawd

    Dec 1, 2011
    Depends on how the ISP has set things up. The SB6141 is fairly old, and limited to 8 down and 4 up channels. Spectrum may require more down channels in order to reach the 400 Mb/s your connection is rated for.

    If you can find a SB6183 for cheap, that might get you up to full (skip the SB6190 and other with the apparently problematic Intel chipset). If cost is less of an issue and you want something that'll probably be useful for longer, consider a DOCSIS 3.1 unit.
  3. Ehren8879

    Ehren8879 [H]ardness Supreme

    Sep 24, 2004
    Nope, though the 6141 bonds eight channels, you also share those channels with your neighbors.

    Time to upgrade that modem to a 6183 or preferable an 8200
  4. Dead Parrot

    Dead Parrot 2[H]4U

    Mar 4, 2013
    Connect via cable direct to the modem and do your speed tests. Also try a different cable. Cat 5e should work but possible that cable is out of spec or has suffered pet/foot damage. I have always felt pretty good about getting 80% speed compared to the marketed speed for a gizmo. You aren't far off that.