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Interface Numbering

Cisco 3620 and Cisco 3640 Interfaces

Each individual network interface on a Cisco 3620 or Cisco 3640 router is identified by a slot number

and a unit number.

Slot Numbering

The Cisco 3620 or Cisco 3640 router chassis contains two or four slots in which you can install modules.

You can install any module into any available slot in the chassis. For Cisco 3620 and Cisco 3640 routers,

the slots are numbered as follows:

•

Unit Numbering

Cisco 3600 series routers have unit numbers that identify the interfaces on the modules and WAN

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 WAN 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 1-7

installed in the module in slot 0. One serial and one ISDN BRI WAN interface card are installed in the

module in slot 1.

Figure 1-7

Cisco 3600 Series Unit Numbers

Serial 0/1

Serial 1/0

BRI 1/0

SEE MAN

UAL BEF

BRI

ORE INST

ALLA TION

NT1

SER IAL

ETH ERN

ET 1

ETH ERN

ET 0

AUI

thernet 1/1

Ethernet 1/0

Ethernet 0/1

Cisco 3600 Series Routers Hardware Installation Guide

1-8

Slot 0 is at the bottom right (as viewed from the rear of the chassis), near the power supply.

Slot 1 is at the bottom left.

Slot 2 is at the top right, above slot 0.

Slot 3 is at the top left, above slot 1.

shows a router with a 2E 2-slot module in slots 0 and 1. Two serial WAN interface cards are

Serial 0/0

SER IAL

ETH ERN

ET 1

ETH ERN

ET 0

AUI

IN PU T

10 0- 24 0V

AC 50 /6

Ethernet 0/0

Power supply

0H Z 3. 0-

1. 5 AM

Chapter 1

Overview of Cisco 3600 Series Routers

OL-2056-05