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. Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=4116&t=4116 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
