Had nothing better to do than sell my easy to configure & predictably slow 2511 for a 2621 with an NM-16 async module. I am @ a loss as to logic involved with the async line numbering. With the 2500 Access-Server, line 1 is 2001 (2000 being Telnet protocol). My 2621 has the NM-16 in slot 1 (as seen in the below output): Firewall#sh diag Slot 1: Async port adapter, 16 ports The given formula is this: interface # = (16 x slot #) + unit # +1 (16x slot # 1) + 1 (physical connection 1) + 1= gives me 18 The router starts the count @ 33 as the first useable line #. So- my range of 16 useable lines is 33 thru 48. My question is: What gives ??? What's the logic here ??? Thanks !!! Phil Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=10532&t=10532 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]