Losing speed when I insert gigabit switch into home network

GrouchoBarx · Oct 5, 2016

Trying to figure out the best way to set up a home network.

I have a cable modem that runs to a gigabit switch where I have multiple computers in a LAN. The problem is that when the computer is connected directly to the router, I get speeds of upwards of 200 Mbps. When I insert the switch into the network, the speed drops to 20 Mbps or less. The switch indicator lights show that all connections are gigabit.

I just finished upgrading the house network to CAT6E. I was using a D-Link DGS-1005D Gigabit Switch, and have swapped that out for a Netgear GS105. THe Cable Modem is a Comcast, fairly recent model (within the last 3 or 4 months), I can get the particulars if it is important.

littleleo · Oct 5, 2016

Is the Wan line from your Modem to the switch also a gigabyte port. Your network will run at the slowest speed connection in your network.

jsmithepa · Oct 5, 2016

The switch is probably the most transparent, trouble-free, just-works component on a LAN so what you said is odd and highly unusual. Did you test with only ONE client on the switch and no one else?

zon · Oct 5, 2016

Maybe the modem can't handle multiple ip addresses at once and need to do modem > router > switch? Unless you have enough ports for the router then no need for the switch.

TMTOWTSAC · Oct 5, 2016

Any chance it could be interference or signal degradation? Does the switch have a collision indicator or keep statistics on dropped packets? What's the length of the cable runs between the devices? Do any of the cables run parallel to electrical wiring or electrically "noisy" devices like dimmer switches, fluorescent bulbs, microwaves, etc?

jsmithepa · Oct 5, 2016

Any chance it could be interference

Anything is possible but the source of the interference has to be very close, let say less than 6 inches) and it has to be power cable running in parallel to the CAT5, just a 90 degree cross won't do it, or in your house or your neighbor you are running some kind of high powered industrial equipment.

signal degradation?

First thing you did was to swap cable did you not? and an ethernet cable can go 100 meters.

Does the switch have a collision indicator or keep statistics on dropped packets?

Only more expensive switches have such feature, the SMART kind or the MANAGED kind. Switches have no collisions, hubs do, that's why nobody use hubs any more.

What's the length of the cable runs between the devices?

100 meters max.

Do any of the cables run parallel to electrical wiring or electrically "noisy" devices like dimmer switches, fluorescent bulbs, microwaves, etc?

Power cables (110 volts or above), if run parallel to CAT5, should be at least 6 inches apart.

TMTOWTSAC · Oct 6, 2016

jsmithepa :

Any chance it could be interference

Anything is possible but the source of the interference has to be very close, let say less than 6 inches) and it has to be power cable running in parallel to the CAT5, just a 90 degree cross won't do it, or in your house or your neighbor you are running some kind of high powered industrial equipment.

signal degradation?

First thing you did was to swap cable did you not? and an ethernet cable can go 100 meters.

Does the switch have a collision indicator or keep statistics on dropped packets?

Only more expensive switches have such feature, the SMART kind or the MANAGED kind. Switches have no collisions, hubs do, that's why nobody use hubs any more.

What's the length of the cable runs between the devices?

100 meters max.

Do any of the cables run parallel to electrical wiring or electrically "noisy" devices like dimmer switches, fluorescent bulbs, microwaves, etc?

Power cables (110 volts or above), if run parallel to CAT5, should be at least 6 inches apart.

I think you've got me confused with the opening poster. And technically, switches can still have collisions if they're running half-duplex. Which can happen with a damaged net cable.

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Losing speed when I insert gigabit switch into home network

GrouchoBarx

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jsmithepa

littleleo

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jsmithepa

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zon

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TMTOWTSAC

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TMTOWTSAC

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