'Intranet and Extranet' (Telecommunications, 2008), 'Introduction to Broadband Communication Systems', Chap. 3, pp. 37-51, DOI: 10.1049/SBTE501E_ch3
IET Digital Library, https://digital-library.theiet.org/;jsessionid=2h7n91th1o77q.x-iet-live-01content/books/10.1049/sbte501e_ch3