[1] An
overview of ISDN technology, Garry Musgrave, CTS-D, updated January 2001
[2] ISDN
Tutorial: Introduction, www.ralphb.net
[3] ISDN
user guide, www.pacbell.com
[4] ISDN,
what it is and what does it do, www.idstech.com
[5]
Broadband ISDN, www.cs.ucl.ac.uk
[6] ISDN, a
little technology, www.hermstedt.com
[7] What is
ISDN, www.tribecatech.com
[8]
Beginners guide to ISDN, www.seg.co.uk
[9] ISDN, www.cisco.com