Hhhmmmm....... Not so sure this is exactly right......
With full duplex, you have effectively created two "directions" --- there
and back.
I believe it is accurate to say that only one packet can be on the wire per
direction at one time.
I can send to you at the same time you are sending to me. But Someone else
can not send to you at the time my packet is on the wire.
Correct me if I'm wrong.
Chuck
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of
Peter I. Slow
Sent: Wednesday, May 30, 2001 7:40 AM
To: [EMAIL PROTECTED]
Subject: Re: elementary? [7:6359]
Noooooooo.
nononononono.
CSMA/CD only gets used when you are not in full duplex. (/me ducks) ( i
have NEVER seen a full-dup. hub) meaning that if i am using a switch capable
of full duplex (as most are) ..conversations, every station can transmit as
much as they want. this is what differentiates between a hub and a switch.
(but not the only thing)
you are correct in that a 100 meg HUB with a gig uplink could never fully
utilize the link, but the case is completly different with a switch.
----- Original Message -----
From: "Vijay Ramcharan"
To:
Sent: Wednesday, May 30, 2001 9:54 AM
Subject: RE: elementary? [7:6359]
> Thanks everyone for their replies. As I now understand it, the 1Gb
> uplink just moves data faster than... say, a 100Mb uplink. Correct?
> Conversations between hosts on each switch still take place one at a
> time, thereby obeying Ethernet rules of one station transmitting at a
> time. Correct?
> Okay my next question. Is there any point at which this 1Gb uplink can
> become saturated, since it's only handling station to station sessions-
> one at a time.
> If a number of stations on each switch were doing large file transfers
> to each other via the uplink, would there be some point at which the
> uplink would be maxed out- in terms of bandwidth? Or is the only
> limiting factor, the workstations inability to pump data out fast enough
> to max out the uplink when they're only running 100Mb?
>
> I'm thinking that it's really not possible to max out a 1Gb uplink when
> stations are only running 100Mb. If this is correct then I lay this
> question to rest.
>
> Thanks.
>
> Vijay Ramcharan
>
>
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of
> Vijay Ramcharan
> Sent: Wednesday, May 30, 2001 12:06 AM
> To: [EMAIL PROTECTED]
> Subject: elementary? [7:6359]
>
>
> Forgive me if this sounds a little bit basic but this is what happens
> when you rush into things without understanding the fundamentals.
> Suppose a 24 port 100Mbit switch called A is uplinked to another 24 port
> 100Mb switch called B via a 1Gb connnection. Suppose hosts D through N
> are on switch A and hosts M through X are on Switch B. Would
> conversations between the hosts from Switch A to Switch B occur one at a
> time or are multiple conversations multiplexed over the 1Gb uplink?
>
> I'm just trying to find out if and how that 1Gb uplink is used up.
> Thanks in advance. I'd put TIA but I hate those little acronyms. No
> flames please.
>
> Vijay Ramcharan
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