Getting some good info here.. So cisco has their own implementation of HDLC.. is it compatible with other non-cisco devices (nothing particular in mind here)? What does the control field of a cisco HDLC frame look like? Thanks!!! Jeremy _________________________________ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]