2
Overview of Cisco 2800 Series Routers
OL-5783-01
Hardware Features
Figure2 Front View of a Cisco 2811 Router
Figure3 Front View of a Cisco 2821 or Cisco 2851 Router
This chapter describes the features and specifications of the routers and includes the following sections:
Hardware Features, page 2
Chassis Views, page10
Interface Numbering, page 16
Specifications, page18
Regulatory Compliance, page25
Hardware Features
This section describes the basic features of Cisco 2800 series routers, including product identification,
built-in interfaces, modules, memory, LED indicators, chassis ventilation, and the internal clock.

Product Serial Number Location

The serial number label for Cisco 2801 routers is located on the rear of the chassis, along the bottom
edge near the lower left corner. (See Figure4.)
95902
Do Not Remove During Network Operation
COMPACT FLASH
CONSOLE OPTIONAL RPS INPUT
12V 11A
AUX
SYS
PWR
AUX/
PWR
SYS
ACT CF
-48V 4A
100-240 V~ 4A
50/60 Hz
0
1
95903
Do Not Remove During Network Operation
COMPACT FLASH
CONSOLE
AUX
SYS
PWR
AUX/
PWR
SYS
ACT CF
0
1
OPTIONAL RPS INPUT
12V 11A
-48V 4A
100-240 V~ 4A
50/60 Hz