not on a switch, and hubs arent full duplex.
-peter slow
----- Original Message -----
From: "Chuck Larrieu"
To:
Sent: Wednesday, May 30, 2001 11:14 AM
Subject: RE: elementary? [7:6359]
> 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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