Cisco PA-2E3 Installation And Configuration Manual page 8

Port Adapter Overview
Figure 1-1 One-Port PA-E3 Serial Port Adapter
Figure 1-2 Two-Port PA-2E3 Serial Port Adapter
The one-port PA-E3 provides two network interfaces per VIP2 for Cisco 7000 series and
Cisco 7500 series routers and the Catalyst RSM/VIP2 for Catalyst 5000 family switches, and one
high-speed interface on the Cisco 7100 series, Cisco 7200 series, and Cisco uBR7200 series routers.
The two-port PA-2E3 provides four network interfaces per VIP2 for Cisco 7000 series and
Cisco 7500 series routers and the Catalyst RSM/VIP2 for Catalyst 5000 family switches, and two
high-speed interfaces on the Cisco 7100 series, Cisco 7200 series, and Cisco uBR7200 series
routers.
Serial network interfaces reside on modular port adapters, which provide a direct connection
between the high-speed bus in the router and the external networks. The PA-E3 provides a
full-duplex synchronous serial E3 interface for transmitting and receiving data at rates of up to
34 megabits per second (Mbps).
The port adapter supports both 16- and 32-bit cyclic redundancy checks (CRCs). The default is
16-bit CRCs; to enable 32-bit CRCs, you use a configuration command. For a description of the CRC
function, see the "Configuring Cyclic Redundancy Checks" section on page 8-10.
Note
individual port adapters do not. To replace port adapters, you must first remove the VIP2 and
Catalyst RSM/VIP2 from the chassis, and then replace port adapters as required.
The Cisco 7100 series, Cisco 7200 series, and Cisco uBR7200 series routers support the OIR of all
port adapter types.
1-2 PA-E3 Serial Port Adapter Installation and Configuration
Although the VIP2 and Catalyst RSM/VIP2 supports online insertion and removal (OIR),
E3 SERIAL
2E3 SERIAL