CSUs/DSUs
A CSU/DSU acts as a translator between the LAN data format and the WAN data format. Such a conversion is necessary because the technologies used on WAN links are different from those used on LANs. In reality, you can think of a CSU/DSU as a digital modem; but unlike a normal modem, which changes the signal from digital to analog, a CSU/DSU changes the signal from one digital format to another. Figure 3.16 shows how a CSU/DSU might fit into a network.
Figure 3.16. How a CSU/DSU is used in a network.
A CSU/DSU has physical connections for the LAN equipment, normally via a serial interface, and another connection for a WAN. Traditionally, ...
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