ks. Traffic engineering, scribed in Chap. 23, allows us to use less than 50,000 trunks, perhaps a lot less, de- pending on the subscriber demand usage patterns. These are the kinds of trunk groups that traditional telephone transport engineers are used to working with. 7This is a legitimate mathematical concept. Whatever measure we want to use for coverage area and boundary, the ratio of boundary to coverage increases as the service area decreases. If radio signal path variation makes inter-MSC handoff likely over a 1-km-wide region around the MSC service region, then there will be more calls in those 1-km regions as the regions themselves be- come smaller in geographic area. 8A vendor will choose the amount of capacity to allocate for mobile-to-mobile calls based on a complex optimization with routing through the PSTN as an alternate route. Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright © 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. Telephone Transport Key Telephony Concepts 13.3 Conclusion In this chapter we have introduced the principles and standards for telephony trans- port. We have discussed the potential effect of a shift from traditional telephony to voice over IP. We also have introduced a number of issues of cost management and ca- pacity planning, with a focus on topics most relevant to wireless networks. Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com Copyright© 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. Source: CDMA CAPACITY AND QUALITY OPTIMIZATION Chapter Signaling with SS7 14.1 Introduction Signaling System 7 (SS7) is both a network architecture and a signaling protocol that has been adopted internationally as a method of signaling for calls in the public switched telephone network (PSTN) and for providing advanced features such as 800 service. It is th