Your failing to take into consideration transport overhead. You don't get 1.544 megabits actual throughput from a T-1. Your also failing to take into consideration protocol over head. A 10k message takes perhaps 14 or 15 k to send.
Dan On Thursday 28 August 2003 12:31 pm, you wrote: > I am trying to figure out capacity for List Deliveries on a T-1 line. I > have questions about data formulas, and capacity of IMail as a List Server: > > > 1). Data transfer formula > A T-1 line is 1.54 megabits per second. Right? > > And a Gigabyte is equal to 8,589,934,592 bits. Right? > > If this is true, a Gigabyte of data should pass through a T-1 connection in > approximately 5,578 seconds (or 93 minutes). I imagine there is some > "slop" either way. But is this close? > > > 2). Data needed formula > Assume there are 300 subscribers on a list. > > If one user sends one 10K message to the list, that would consume 3MB, > right (10,000 x 300)? > > So 50 messages sent every day, for 30 days, would be the rough equivalent > of 4.5GB of data in a month's time. Is this correct? > > And that works out to approximately 7.5 hours of T-1 line use, right? > Which means approximately 90 lists like this would saturate a T-1 line in a > month. Right? > > > 3). I believe there was a thread, some time back, about using IMail as a > List Server. Someone commented that Listserv should be used for heavy-duty > listing. I checked with LSoft and their product would be about $18,000 the > first year (and around $6,000 in subsequent years). I have a bunch of > smaller lists (300 members or so) for non-profits and $18,000, even divided > among 10 groups, is cost prohibitive. > > But, if IMail can't handle it, then I guess we will just continue to do > without. > > > 4). Bcc and ISP grouping > I have read that it is faster to setup a group at a domain and deliver them > all at once to that group? Is this true or not? > > I guess I don't understand how groups work. It seems like it would have to > deliver the same amount of messages, to the same amount of people, > regardless of whether or not it is 10 individuals or 10 individuals in a > group. > > > Is there a resource (especially an online resource) that explains this so I > may understand it better? > > Thanks in advance. > > > To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html > List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ > Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/ To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/
