 becomes a customer service issue. The main processor can be too slow for the call processing, short messages service (SMS), and handoff activity. For the same CDMA resource, voice calls tend to use a lot more call processing than data calls, so a provider counting on a migration from voice to data may be surprised when voice service remains dominant. SMS traffic follows so- cial trends that can change dramatically. And a few pilot-pollution zones that escape the air-interface design process can increase handoff activity beyond our expectations. Any of these can place loads on the MSC processor. 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. Measuring System Performance for Growth Increasing Capacity The circuit-switching resources may not be adequate. This will happen if there is an increase in voice calls instead of the forecast growth in data service. The circuit- switching components of the MSC that were engineered for the data-heavy market will be underengineered if voice traffic grows instead. An unexpected increase in voice call de- mand also will bring about a similar demand for speech-coding equipment at the MSC. The packet-switching resources may not be adequate. If data service takes off faster than expected, then we will find ourselves short of packet capacity. Customer interest in real-time video or multimedia message service (MMS) could bring packet data lev- els to a higher level than we originally planned for. We do not have to measure the total transport connected to the MSC. We can count the DS-1 or E-1 links to the base stations, other MSCs, the public switched telephone network (PSTN), the public packet data network (PPDN), private networks, and the Signaling System 7 (SS7) network. This is the total transport. (At least there is one switch component whose usage is obvious from looking at it.) The system should monitor t