couple of things - I'd missed the bridged bit, a routed network would be far preferrable. 128Mb/s was a typo on my part - should have been 128Kb/s for the 128Kb/s link - at least I got the transfer time right ;-) Andy ----- Original Message ----- From: "KM Reynolds" To: Sent: Friday, May 11, 2001 2:22 AM Subject: Fwd: Re: Sending JPEG across an ISDN bridged link brings the [7:4116] > Hi Andy, > > Thanks for explanation. We are currently looking at upgrading the link. I > am also going to suggest to the customer to change from a bridging > environment to a routed one. If the two sites are segmented(enable the use > of layer 3) it will enable us to implement QOS. > > I have one last question for you or anyone in the group. The math(in your > reply e-mail), I was not going to ask this question because I think I should > naturally know this. I understand the "File size" 2Megabytes is equal to > (2*8) 16 Megabits. I do not understand the "Transfer time:", how did you > arrive to 128 Megabits per second? > > I am fuzzy on the transfer time formula. If you or someone may explain or > point me in the direction where I may learn this, I would be grateful > > Thank you, > > KM > > > >From: "andyh" > >Reply-To: "andyh" > >To: [EMAIL PROTECTED] > >Subject: Re: Sending JPEG across an ISDN bridged link brings the network > >[7:3786] > >Date: Wed, 9 May 2001 09:06:53 -0400 > > > >let's do the maths: > > > >File size: 2MB = 16Mb > > > >Transfer time: 16Mb / 128Mb/s = 125 sec - ie a pretty long lime for those > >used to LAN-type speeds > > > >a better explanation would be to try to empty a bucket through a pinhole in > >the bottom - the point being that the data *will* get through (disregarding > >application timeouts or similar), whereas you're never going to get a lemon > >onto a pop bottle without breaking the bottle or splitting the lemon. > > > >one possible solution would be to implemet some sort of queueing - > >prioritize delay-sensitive traffic (interactive sessions and the like), and > >give large file transfers (ftp, http) a lower priority. Saying that it > >sounds like you need to get yourself some extra bandwidth - depending upon > >your needs you might wish to look at leased lines. probably time for you > >to > >do the maths as to whether you can justify the expense ;-) > > > >Andy > > > >----- Original Message ----- > >From: "KM Reynolds" > >To: > >Sent: Wednesday, May 09, 2001 1:34 AM > >Subject: Sending JPEG across an ISDN bridged link brings the network to > >[7:3720] > > > > > > > Hi all, > > > > > > Need the groups advice. > > > > > > The network consists of two 1605 routers with 128k ISDN connections in a > > > transparent bridge environment. > > > This network suffers from lockups often,however, not consistently. > > > Yesterday, speaking with a user, he asked me a question. The question > >was, > > > "Why is it when I send a JPEG file to a user located across the ISDN > >link, > > > the network come to a halt?". > > > I told him that if the JPEG was very large in size ex. 2MB, when it has > >to > > > cross the ISDN link, its like trying to squeeze a lemon(a small one) > >into > >a > > > pop bottle(maybe not a good example, but that is all I could think off). > > > This saturates the ISDN link which is only 128k. > > > > > > Am I correct in my explanation? What would be a good explanation? I am > >not > > > comfortable with my explanation(maybe I am wrong). I look forward to > > > hearing the groups thoughts, as well as any solutions(change to routing, > > > QOS, etc.) > > > > > > TIA > > > KM > > > > > > > > > > >_________________________________________________________________________ > > > Get Your Private, Free E-mail from MSN Hotmail at > >http://www.hotmail.com. > > > FAQ, list archives, and subscription info: > >http://www.groupstudy.com/list/cisco.html > > > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] > >FAQ, list archives, and subscription info: > >http://www.groupstudy.com/list/cisco.html > >Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] > > > _________________________________________________________________________ > Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. > FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=4190&t=4190 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
