WiFi
http://www.eweek.com/article2/0,1759,1735082,00.asp

DWDM
http://www.cisco.com/univercd/cc/td/doc/product/mels/cm1500/dwdm/dwdm_ovr.htm
http://www.findarticles.com/p/articles/mi_m0TLC/is_7_36/ai_87720358
http://wireless.ittoolbox.com/documents/document.asp?i=1713

IP Phone
http://www.juniper.net/solutions/literature/white_papers/200011.pdf
http://www.voip-news.com/arch1.htm
http://www.onelasvegas.com/wireless/VoIP.html

WIMAX
http://www.wimaxforum.org/technology/White_Papers/
http://www.alvarion.com/RunTime/Materials/pdffiles/Wimax_wp.pdf
http://www.wi-fiplanet.com/wimax/article.php/3438551