Installation guide

1-23
Cisco Interface Cards Installation Guide
OL-1919-12
Chapter 1 Overview of Cisco Interface Cards
Cisco 2600 Series Routers
Cisco 2600 Series Interface Numbering
Each individual network interface on a Cisco 2600 series router is identified by a
slot number and a unit number.
Slot and Unit Numbering
The Cisco 2600 series router chassis contains one slot in which you can install a
network module. This slot is always slot 1.
Unit numbers identify the interfaces on the modules and interface cards installed
in the router. Unit numbers begin at 0 for each interface type, and continue from
right to left and (if necessary) from bottom to top. Modules and interface cards
are identified by interface type, slot number, followed by a forward slash (/), and
then the unit number; for example, Ethernet 0/0.
Figure 1-10 shows a Cisco 2612 router with a 2E 2-slot module in slot 1. One
serial and one ISDN BRI WAN interface card are installed in the module.
Figure 1-10 Cisco 2612 Router Unit Numbers
Note Interface card slots (built into the chassis) are always numbered as slot 0, even if
the interface card is installed in the slot labeled W1.
ETHERNET 1
ETHERNET 0
2E
2W
W1
W0
ACT
ACT
LINK
AUI
EN
LINK
SEE MANUAL BEFORE INSTALLATION
B1
B2
ACT
BRI
NT1
ACT
SERIAL
ACT
SERIAL
ACT
SERIAL
W0
W1
W0
AUX
CONSOLE
ETHERNET 0/0
ACT
LINK
ACT
TOKEN RING 0/0
LINK
Cisco 2612
100-240V– 1A
50/60 Hz 47 W
41181
Serial 0/0Serial 0/1Serial 1/0 BRI 1/0
Ethernet
0/0
Auxiliary
port
Console
port
Token
Ring 0/0
Ethernet
1/0
Ethernet
1/1