Tim Metz wrote: > > so to rephrase the original question, although there is never > more than one > token on the ring, there can be more than one data/command > frame...????
Yes. There can be more than one frame if you use Early Token Release. It's not likely, but it's allowed by the specifications. There's just one token though. The token is a 3-byte "symbol of authority." That's what IEEE 802.5 calls it, probably to avoid using the term frame. ;-) A sender grabs the token and converts it do a frame, changing one bit, adding more bytes and addressing, etc. Why are you studying Token Ring?? Ugh. ;-) _______________________________ Priscilla Oppenheimer www.troubleshootingnetworks.com www.priscilla.com > > or am I totally missing the point ;-) > > Tim > > ""Priscilla Oppenheimer"" wrote in > message > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > > Mike Mandulak wrote: > > > > > > Oops I forgot to cc my reply to the list again. but you're > > > right. > > > > > > Here's what I sent him... > > > Only one. However (there's always a however) the adapters > can > > > be configured > > > to use ETR (early token release) which means that as soon > as an > > > adapter > > > starts receiving a frame it can start transmitting its own > data > > > out the TX > > > path while receiving the incoming frame. While that's not 2 > > > tokens, it is 2 > > > different frames on the wire at the same time. > > > > That's not really what it means, not that it matters much > these days. ;-) > > > > With no early token release, a sending station must see its > own frame come > > back before it releases a free token that someone else can > grab. > > > > With early token release (ETR), a sending station can release > a token at > the > > end of its transmission, regarless of whether it's starting > to receive its > > own transmission yet. Someone else can grab the free token > and turn it > into > > a frame. Hence, there can be more than one frame, as you say, > but still > only > > one free token. > > > > It was all a bunch of marketing FUD really though. It would > have to be a > > physically very large network for the ETR feature to make any > difference. > On > > typical networks, the sender was already getting back its own > transmission > > as it finished its transmission anyway. So it released a free > token at > about > > the same time regardless if ETR was in use or not. But nobody > cares any > more > > about the actual behavior. You just have to learn the theory. > ;-) > > > > _________________________ > > > > Priscilla Oppenheimer > > www.troubleshootingnetworks.com > > www.priscilla.com > > > > > > > > > ----- Original Message ----- > > > From: "Ken Chipps" > > > To: > > > Sent: Sunday, September 22, 2002 9:37 PM > > > Subject: Re: Token Ring fundamentals [7:53871] > > > > > > > > > > One, unless early token release is in effect. Assuming I > am > > > remembering > > > > my old Token Ring stuff right. > > > > ""Tim Metz"" wrote in message > > > > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > > > > > While doing some token ring reading I realized that I > have > > > no idea how > > > > many > > > > > tokens can be on the ring at one time. > > > > > > > > > > > > > > > > > > > > anyone??? stupid question?? > > > > > > > > > > > > > > > > > > > > Tim > > Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=54000&t=53871 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
