@BOOK{ iet:/content/books/te/pbte071e, author = {Andy Valdar}, affiliation = {Electronic & Electrical Engineering, niversity College London}, keywords = {telecommunications networks;network components;telephony;standards;mobile systems;transmission networks;data switching;routing;transmission systems;signalling;circuit-switching systems;}, title = {Understanding Telecommunications Networks, (2nd Edition)}, publisher = {Institution of Engineering and Technology}, year = {2017}, series = {Telecommunications}, url = {https://digital-library.theiet.org/;jsessionid=v5a0a57qflws.x-iet-live-01content/books/te/pbte071e} }