C H A P T E R 1
Overview
This chapter describes the one-port PA-T3 and two-port PA-2T3 serial port adapters. This chapter contains the following sections:
Port Adapter Overview, page 1-1
PA-T3 Serial Port Adapter Features, page 1-2
Management Information Base, page 1-3
Port Adapter Overview
The PA-T3 serial port adapter is a single-width, one-port or two-port module that integrates data service unit (DSU) functionality into the Cisco router. It provides one or two high-speed serial PA-T3 interfaces on Cisco 7100 series routers, Cisco 7200 series routers, Cisco uBR7200 series routers, on the second-generation Versatile Interface Processor (VIP2) in all Cisco 7000 series and Cisco 7500 series routers, and on the Catalyst RSM/VIP2 in the Catalyst 5000 series switches. (See Figure 1-1 and Figure 1-2.)
Note Port adapters have a handle attached, but this handle is occasionally not shown in figures in this publication to allow a full view of detail on the port adapter’s faceplate.
Figure 1-1 One-Port PA-T3 Serial Port Adapter
DS3 SERIAL 
H10041
