Hub Theory Question

[bakker]

If I have a hub with devices connected to it at 100Mbps and 10Mbps using TCP/IP, what will be the throughput of the hub? The bandwidth should still be 100Mbps but will the throughput only be 10Mbps?

[DVNT1]

It will be at the fastest "common rate" of all the devices used for the communication.

If...

hub: 10/100

device1: 10/100

device2: 10

device3: 100

-----------------------------

device1 <-> device2 = 10

device1 <-> device3 = 100

device2 <-> device3 = 10


(I think this is what your asking about)

[bakker]

I understand that protion but I trying to see the hub side. Since the hub broadcasts the packet to all ports, does it broadcast at the lowest bps rate on the hub or the highest. For example, if the 100Mbps device sends a connection request to another device, will the hub broadcast at 100Mbps or 10Mbps?

I hope this clarifies my question.


Thanks
Brian

[Praetorian]

DVNT1- The way I understand it is that when using a hub your connection will only run as fast as the slowest NIC on your network. If you're using a 100mbps hub and have one machine with a 10mbps NIC in it, that machine will bring the whole network speed down. Upgrade that machine's NIC and your back up to 100mbps.

[DVNT1]

That *may* be true with some hubs.

I just tested throughput to a host 1 hop and 3 hubs/switches away...throughput was avg. 26 megabits/sec. There are several 10baseT devices on these switches/hub.


1 switch - 3COM SS 3300 (10/100)

1 switch - HP ProCurve 4000 (10/100)

1 router

1 hub - 12 port 3COM DS500 (10/100)