Motorola SB5101u cable modem

Eduardo Morras emorrasg at
Sun Dec 15 11:18:47 UTC 2013

On Sun, 15 Dec 2013 11:04:12 +0800
Fbsd8 <fbsd8 at> wrote:

> Having very slow speeds on my LAN. Looking for cause.
> I have a D-link DIR-655 10/100/1000 router behind the cable modem.
> The specs on this Motorola SB5101u cable modem states it has 10/100 
> mbps, but then it also says "internet download speeds up to 38 mbps and 
> upload speeds up 30 mbps.
> I am paying my ISP for 4 gbps down and 2 gbps up service.
> Is this Motorola SB5101u cable modem a bottleneck causing my slow lan 
> speeds?

If you are paying for a 4/2 Gbps connection but your cable modem can connect your LAN to ISP at 0.038/0.03 Gbps only, then you are wasting money. The bad news are that although DOCSIS 3.1 (cable modem standard, like ethernet) allows 10Gbps modems, the faster ones works at 4 Gbps and were presented some moths ago. They will not be cheap when they become available next year(2014). Are you sure it's a 4/2 Gigabps connection and not a 4/2 Megabps ?

The connection on your LAN is managed by the D-LINK router where I suppose you connect your equipment. What speeds do you get? 

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Eduardo Morras <emorrasg at>

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