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Tutor

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9 Messages

Fri, May 18, 2018 2:33 PM

Gigabit through internet switch

I recently had Uverse gigabit fiber installed and I get around 950mbs according to the AT&T Speedtest site on my main computer sitting next to the gateway. The gateway is a model 5268AC. I have internet, Uverse TV and home phone through it. My wife's computer is at the other end of the house so I bought a Linksys 8 port gigabit ethernet switch, model SE3008 to connect to her computer. I ran 5E cable to the switch and from the switch to her computer. I can only get around 93mbs on her computer. I can take my Macbook and connect to the cable going from the gateway to the switch and get 930mbs, but coming out of the switch I get only 90mbs. I have tried several cables and several ports on the gateway and on the switch. I contacted Linksys support and they have no idea but sent me a replacement switch. It does the same. Is there some kind of incompatibility with the gateway and an internet switch?

 

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Employee

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5.9K Messages

2 years ago

heres an article from CNet but im leaning towards wht @Gpz1100 stated maybe your computers network card isnt gigabit

Until recently, most home routers supported speeds of 10 or 100 megabits per second. However, Gigabit Ethernet routers have become more common. All three cables can work with Gigabit Ethernet. The old-fashioned Cat 5 cable is no longer a recognized standard, but it technically supports gigabit speeds--just not well. Cat 5e cable is enhanced to reduce interference so that it can reliably deliver gigabit speeds. However, Gigabit Ethernet still pushes the cable to its limits.

Cat 6 cable is full-on certified to handle Gigabit speeds--it's meant to handle it and it does it the best. It's also suitable for any 10-Gigabit uses that may come along someday; although at that point, you're pushing the limits of Cat 6. And let's not get into Cat 7 and it's fairyland of 40-Gigabit speeds.

Cat 6 cable also has more stringent specifications for crosstalk and system noise than Cat 5e does. That means you'll get fewer errors on a system operating via Cat 6.

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sfortin7

Scholar

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98 Messages

2 years ago

It's not configurable right? Maybe the order that the switch and computer are powered up?

Tutor

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9 Messages

2 years ago

No, the switch is not configurable. Can't see any reason it would matter which device is powered up first, but I have tried it enough so that I had have the switch up first and then the computer up first.

It's got to be something that the gateway is sensing when it connects to the switch. Maybe there is some way to set up the gateway to ignore that.

sfortin7

Scholar

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98 Messages

2 years ago

@kodak1888 Yes - I think you've nailed it.

 

On my PGW210-700 there is a gateway config screen: Home Network | Configure. My settings are currently "Auto".

Try forcing the port connected to the switch to 1G Full Duplex. Save and reboot the gateway. Otherwise, I suppose you could try 1G Half Duplex.

The point is, don't let the Gateway negotiate it.

_xyzzy_

ACE - Expert

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15K Messages

2 years ago

What else is conned to that switch?

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Tutor

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9 Messages

2 years ago

I wish I could do that. On my 5268AC gateway the only options are:

 

Auto-detect

10BaseT/Full-Duplex

10BaseT/Half-Duplex

100BaseT/Full-Duplex

100BaseT/Half-Duplex

 

I have tried 100base and it doesn't help. They normally are set at auto.

 

The Gateway is sensing what's on the end of the cable. At present I have 2 computers connected

directly to Gateway ports and they both say the speed is 1Gbps, The port with the cable going to the switch says 100Mbps.

 

Tutor

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9 Messages

2 years ago

Well I have tried it with nothing except a Macbook connected to it and can only get 95Mbps

_xyzzy_

ACE - Expert

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15K Messages

2 years ago

Maybe you should return it.  I recommend the 5 or 8 port Netgear gigabit switches.  They appear to be the most popular and successful based on various threads in these forums.

___________________________________________________

This is a public forum and I am a customer just like you. Click "Like" if you feel this post is helpful and "Accept as Solution" if it solves your problem.

Award for Community Excellence 2019 Achiever*
*I am not an AT&T employee, and the views and opinions expressed on this forum are purely my own. Any product claim, statistic, quote, or other representation about a product or service should be verified with the manufacturer, provider, or party.

Tutor

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9 Messages

2 years ago

For now I am waiting to hear from a Linksys 'Sustaining Engineer' from somewhere overseas who was passed this problem after Linksys support gave up on it. He is supposed to contact me either Sunday or Monday. I am hoping he has some idea, but if anyone on the board has other ideas, I would love to hear them. If Linksys does give up, I guess I will try the Netgear switch next.

Gpz1100

Scholar

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86 Messages

2 years ago

To the OP, are you absolutely sure the network card in the pc getting 93 mbps is actually gigabit capable?  For gigabit, everything along the path has to support it.  What's the model of the network card in the pc?

 

We have a similar set up here, with the furthest computer about 100' away from the where the main router is.  The signal goes through 3 or 4 other switches before arriving at the far end.

 

Did you terminate the cable ends yourself or they were bought the ends installed?  Usually commercially terminated cables are properly done, but on a few occasions i've seen where the termination was poor (not all wires making contact) or using improper order.  Both are important for the cable to work properly.

Tutor

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6 Messages

2 years ago

I've found in my experience that anything that's not a computer (or phone or tablet) has speeds reduced when connected to the gateway. If I connect directly to the gateway, I get 850 to 950 Mbps. If I insert a gigabit switch between the gateway and computer, it drops to 25 to 95 Mbps. Nothing else was changed and cables were tested with both connections. Cables are Cat 5e or 6 and switches have included Linksys, Netgear, Cisco, and Meraki. When connecting a router to the gateway the same thing happens. Routers have included Cisco, Netgear, and TP-Link - all AC routers with gigabit ports. So, I feel your pain.

Gpz1100

Scholar

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86 Messages

2 years ago

^^Something not right with your switch(es).  As mentioned, i've got a number of switches in between the ONT and furthest computer without any issues saturating the connection.

 

Specifically, bgw210<>Sophos utm box<>Netgear R7000 (with xwrt firmware)<>Asus rt-ac66u<>Dlink 5 port gigabit switch<>asus Rt-ac68u.

 

The 66u has all wifi disabled and just functions as a smart switch (have several vlans configured).  The other routers are all in AP mode and have various pc's attached via wired means (cat 5e or cat6). So by my count, the signal actually goes through 5 different switches before reaching the most distant pc.

 

My money is on a cabling issue or network card not supporting gigabit.

Tutor

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6 Messages

2 years ago

All of them?!? And like the OP, I used various cables for both tests making sure to test each of them in both configurations. Same results. AT&T doesn't see a problem because the gateway to the internet shows a 1 Gb connection.

 

And, for clarification, I'm on my third gateway. The first one actually worked fine for a while with attached devices until one of the updates. This is why I think that it's some kind of sensing (or intentional control) issue within the gateway firmware.

Tutor

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9 Messages

2 years ago

Yes the computer that I am testing with is a 2014 Macbook Pro and it will get 950Mbps when connected in front of the switch, but behind the switch it gets 93Mbps. The cables that I am using were store bought, and like I said I can connect to them without going through the switch and I get gigabit, so I know they are good. I am retired from IBM with over 25 years experience working on computers so I am not going into this cold. I admit I have little experience with internet problems since my job was mainframes, but I can do diagnosing and problem solving.

Thanks to all for the interest and suggestions

sfortin7

Scholar

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98 Messages

2 years ago

You could ask ATT to send you out a BGW210-700 and you could configure the port as I said, or you could wait for Linksys to provide a custom firmware load for the switch, or just get a different switch. Hopefully, that Linksys engineer will get back to you. 

 

I think it likely, the gateway is negotiating correctly with the computer, but not with the switch. We don't know which end has it right, or has it wrong, the gateway or the switch.

 

The fact that port speed can be switched from auto to something else, i.e. it is configurable in the BGW210-700 is I think very interesting.

 

I looked on Amazon and I didn't see reviews of people complaining about the speed of the device or a Google search didn't turn up reports of problems.... does that mean, Linksys got it right?