Ethernet speed

totaram
totaram used Ask the Experts™
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Say a 24 10M port ethernet switch has an uplink connected to 1 T1 line, and all the access ports are active, will every port still work as 10M if speed (config'ed as 10M) or will there be a considerable slow-down on T1 link (1.54M capacity)?
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It depends on the switch, but generally the ethernet speed doesn't depends on the T1 line. However, if devices connected to switch are accessing all to internet,m the 1.54M capacity will be shared between every device, so this is the bottleneck when connecting to internet.

Hope it helps.
Aaron TomoskyDirector of Solutions Consulting

Commented:
If the devices are connecting to each other they will communicate at 10m. If they are sending traffic over the t1 that will go at 1.5m.

Author

Commented:
Sorry, I should have mentioned the internet connectivity for all the devices connected here...

So, if the T1 is being shared all the ports, that leaves (1.54/24) or 64k for each port. However, we have each sw port config'ed as 10 M port.
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Aaron TomoskyDirector of Solutions Consulting

Commented:
Unless your switch has qos it will try to randomly share the t1. So if only one port is using it, it will get the full 1.5.

Author

Commented:
so the other ports would be waiting for one port to relinquish the control?? That is too much.. most switches have auto-qos, right??
Director of Solutions Consulting
Commented:
No. It will devide it up as equally as it can, you just have no control over it.
Top Expert 2007

Commented:
In an unmanaged switch it will be random. But most usage is also random, so it works out, except in some cases of heavy usage ( large uploads/downloads).
Your internal speeds will not be affected, but internet access will always be limited to your max T1 speed.


I hope this helps !
Neil RussellTechnical Development Lead

Commented:
It does not matter if the ports are configured as 10 meg or gigabit. You are limited to 1.5 of the T1. You cant expect to get more just because your switch ports are capable of more.
Each port is CAPABLE of 10meg that does not mean it will always be running maxed out at 10 meg.
Your T1 is capable of 1.5M and it is unlikely that it will be permenantly maxed out or stressed UNLESS you are using it for large upload/download. IF used for mail/browsing and applications you wont notice any degridation at all I would think.
Kerem ERSOYPresident
Commented:
Your users will communicate among themselves in 10M speed. But when it comes to internet access They will all share the existing capacity of 1.54 Mbps.

Unless you have QOS capability in which you can prioritize the T1 traffic your users will race through the traffic. If they all rush at the internet they will all feel a slow-down. So there's no rule who will get the most of the traffic etc.  

Cheers,
K.

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