I'm reading Cisco LAN Switching and I'm fascinated by the layer 1 technologies (protocols? encodings?). So far: manchester, 4B/5B, 8B/10B, PAM 5x5, and many others I don't recall right now. Do you know of good books on the subject? Then I'll have something to read on the 5 minutes I'm not with my girlfriend/working/Cisco studying/in College/College studying/eating/sleeping! Well, maybe a little more on the weekends. =^D Thank you. Francisco, CCNA, CCDA. ___________________________________ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]