10
TIME-DIVISION-MULTIPLEXED SWITCHING
10.3.3 Strictly Nonblocking Design
10.3.4 Varying Port Configurations
10.4 Central Memory TDM Switches
10.4.1 Cost Model for Central Memory TDM Switches
10.4.2 Limits of Central Memory Design
10.5 Ingress-Buffered TDM Switches
10.6 Egress-Buffered Self-Select TDM Switches
10.7 Sliced Single-Stage SNB TDM Fabrics
10.8 Time–Space Multistage TDM Fabrics
10.8.1 Architecture and Costs of Time–Space–Time Switch Fabrics
10.8.3 Space–Time–Space Switching
10.9 Multistage Memory Switches
10.1 INTRODUCTION
This chapter is the second in a sequence of three chapters on the switching technologies used in various layers of transport networks. Chapter 9 provided an overview of switching issues and considered the switching of complete physical signals. This chapter covers the switching of logical circuits or time-division-multiplexed (TDM) signals. Chapter 11 covers the switching of packets and cells.
Although the Internet seems to be moving toward packetized traffic of the TCP/IP protocol suite, it would be a mistake to assume that only packet (or cell) switching techniques are required and that TDM is a sunset technology that could slowly be retired as it is replaced. Instead, there are compelling reasons to continue to use and to understand TDM protocols and systems. The irreplaceable ...
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