Okay,now I'm Confuzzled. A Token ring Frame is timed so that the first bit
of a MTU sized frame returns to the Sending station immediately after the
last bit was transmitted. Then It checks the error/received bits and strips
it off the ring. How could it work full duplex unless there were two tokens
on the ring?
----Original Message Follows----
From: Priscilla Oppenheimer <[EMAIL PROTECTED]>
Reply-To: Priscilla Oppenheimer <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
Subject: Re: Token ring and duplex
Date: Tue, 17 Oct 2000 17:59:22 -0700
The Dedicated Token Ring port adapter (PA-4R-DTR) is available on Cisco
7500 series routers, Cisco 7200 series routers, and Cisco 7000 series
routers with the 7000 Series Route Switch Processor (RSP7000) and 7000
Series Chassis Interface (RSP7000CI).
The PA-4R-DTR provides up to four IBM Token Ring or IEEE 802.5 Token Ring
interfaces. Each Token Ring interface can be set for 4 Mbps or 16 Mbps
half-duplex or full-duplex operation and can operate as a standard Token
Ring station or as a concentrator port. The default for all interfaces is
Token Ring station mode with half-duplex 16-Mbps operation. The PA-4R-DTR
connects over Type 1 lobe or Type 3 lobe cables, with each interface
providing an RJ-45 receptacle.
So, Token Ring does have a "full-duplex" operation. I guess you would use
it on back-to-back links, just like you use full-duplex Ethernet on
back-to-back links.
Priscilla
At 05:13 PM 10/17/00, Ejay Hire wrote:
>Full-Duplex/Half-Duplex settings do not apply in a Token ring environment.
>
>Duplex settings deterrmine whether or not a system can recieve and
>transmit at the smae time in a CSMA/_C_ollision _D_etect (Ethernet)
>environment.
>Token Ring Does not use CSMA/CD, but use token-passing instead.
>
>On a Token Ring network, only one system transmits at a time, all of the
>others listen.
>
>
>----Original Message Follows----
>From: "SH Wesson" <[EMAIL PROTECTED]>
>Reply-To: "SH Wesson" <[EMAIL PROTECTED]>
>To: [EMAIL PROTECTED]
>Subject: Token ring and duplex
>Date: Tue, 17 Oct 2000 18:07:16 GMT
>
>If a token ring is running at a speed of 16, should the duplex be full or
>half. If it's at half, what may be some problems as a result of it.
>thanks.
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________________________
Priscilla Oppenheimer
http://www.priscilla.com
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