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Posted by on February 8, 2005, 9:31 pm
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What is the difference between 24-port Hub and 24-port switch,
especially in physical connections wise?. Does switch needs an uplink?.
If yes, why?. How can I decice whether I need Hub or Switch?.
Thanks.
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Posted by $Bill on February 8, 2005, 9:37 pm
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santa19992000@yahoo.com wrote:
> What is the difference between 24-port Hub and 24-port switch,
> especially in physical connections wise?. Does switch needs an uplink?.
> If yes, why?. How can I decice whether I need Hub or Switch?.
Over simplified explanation :
Hubs are real dumb and switches are slightly smarter and can lower the
LAN traffic in certain cases by being selective in replicating the data.
Hubs are pretty much on the way out these days and switches are almost
as cheap.
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Posted by Greg on February 9, 2005, 6:11 am
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For the usual home user there is no real difference. Put a half dozen users on
that LAN and the switch will increase throughput.
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Posted by Bit Twister on February 9, 2005, 6:57 am
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On 8 Feb 2005 21:31:49 -0800, santa19992000@yahoo.com wrote:
> What is the difference between 24-port Hub and 24-port switch,
> especially in physical connections wise?. Does switch needs an uplink?.
> If yes, why?. How can I decice whether I need Hub or Switch?.
switch: each port does not see other port's packets.
hub: each port's packets are seen on all ports and packets on one
port can collide with other ports, causing more retransmission.
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Posted by David H. Lipman on February 9, 2005, 1:48 pm
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The best answer.
To add to it...
An Ethernet Switch (E-switch) breaks up each port into separate Collision
Domains while hubs
have just one collision domain and are basically multi-ported repeaters.
E-switches on the
other hand allow a node connected to a switched port to work in Full-Duplex mode
and turns
off the collision detection is the Ethernet standard Carrier Sense with Multiple
Access
(CSMA) with Collision Detection (CD). Thus a node connected to an E-switched
port can send
and receive at the same time. Thus a 100Mb/s NIC can have an maximum transfer
rate of
200Mb/s. Since each port has its own collision domain, there are less
retransmissions of
sent packets, the overall effectiveness of the LAN is increased. However, on
most SOHO
Routers or on many cheap E-switches, the latency of the switch can offset that
effectiveness. Hubs just re-time and send the signal and don't introduce a
delay factor
otherwise known as latency. E-switches on the other hand do introduce latency.
A good
switch might be rated at less than 10ns a cheap switch might be rated at
40~100ns. While
that might not seem much, that is for each packet sent/received and if your
sending
thousands of packets it adds up.
Like a hub, there is a cross-over (X-MDI) or not crossed-over (MDI) port or a
physical
switch to change the state of a port from MDI to X-MDI. This uplink port allows
the
E-switch to be chained with others.
Physically both hubs and switches look the same but an E-switch is definitely
better !
--
Dave
| On 8 Feb 2005 21:31:49 -0800, santa19992000@yahoo.com wrote:
| > What is the difference between 24-port Hub and 24-port switch,
| > especially in physical connections wise?. Does switch needs an uplink?.
| > If yes, why?. How can I decice whether I need Hub or Switch?.
|
| switch: each port does not see other port's packets.
|
| hub: each port's packets are seen on all ports and packets on one
| port can collide with other ports, causing more retransmission.
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