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Contributor

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3 Messages

Sat, Jul 20, 2019 11:46 PM

Mix fast ethernet and gigabit

I have att fiber (1 gig) internet service. I was wondering if I can add one fast ethernet (100base t) cat 5 to the network. The reason being is that the installer used the brown and white with brown twisted pair from a cat 5 cable that ran to one room for power to psu/battery backup for the outside unit. I then had the battery backup box moved to another room still retaining the cat 5 in the original room. I would still like to utilize the Cat 5 between the rooms minus the brown twisted pair, hence fast ethernet only. Would it slow down all my other gigabit cat 6 runs? Would I connect directly to modem or to switch after modem? 

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Brand User
ATTHelp

Administrator

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108.6K Messages

7 months ago

Hello, @Megahurts.

Connecting a device with a 100base T Cat5 will not impact your speeds anymore than connecting more devices on your network would, since your bandwidth is shared across all connected devices. It is possible you will see a minor speed drop, but it should not be anything significant.

If you were planning on connecting the 100base T Cat5 to the switch, then connecting Cat6 from the switch to other devices, your maximum speed from the switch will only be 100 MBPS, since that is the maximum output of the Cat5.

It is always recommended to use only Cat5e or Cat6 with an internet package over 100 MBPS in order to get the most out of your internet package.

We hope this helps.

John, AT&T Community Specialist

*I am an AT&T employee, and the postings on this site are my own and don't necessarily represent AT&T's position, strategies or opinions.
Brand User
ATTHelp

Administrator

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108.6K Messages

7 months ago

Hi @Megahurts!

Thank you for reaching out to us here, we'd love to answer your questions!

To get started, you can either connect directly to your modem or to a switch. Please note that, to get the optimal speeds for your fiber package, you should use Cat 5E or Cat 6 Ethernet inside of your home.

We hope this helps!


Yetty, AT&T Community Specialist

*I am an AT&T employee, and the postings on this site are my own and don't necessarily represent AT&T's position, strategies or opinions.

Contributor

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3 Messages

7 months ago

I do have cat5e and cat6, but can I mix fast ethernet (100base t) and
gigabit (1000base t) on same network without the speed defaulting to the
lower speed (100mbps) for all
Brand User
ATTHelp

Administrator

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108.6K Messages

7 months ago

@Megahurts,

 

You can use 100BaseT on your gigabit connection, but 100BaseT can transfer at a maximum of 100 Mbps up and down (full duplex). In other words, you will not be able to take full advantage of your gigabit speeds. Since you're running a switch behind the AT&T router, we'd recommend using 1000BaseT cabling from the router to the switch that way the switch gets access to full bandwidth.

 

Hope this was helpful!

 

Rury, AT&T Community Specialist

*I am an AT&T employee, and the postings on this site are my own and don't necessarily represent AT&T's position, strategies or opinions.

Contributor

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3 Messages

7 months ago

Yes, I have cat6 from att modem/router to mesh router to switch. I would
only use one 100base t cable since the brown and white with brown twisted
pair inside is being used for power to the outside unit (att installed). My
only concern was if used would it degrade the remainder of gigabit
connections. I would plug into empty slot on att modem/router before the
switch