Cisco Systems CISCO1841-HSEC/K9-RF manual Interface Numbering, Slot Number, Slot Type, Example

Chapter 2 Overview of Cisco 1800 Series Routers (Modular)

Interface Numbering

1	Input power connection	8	CompactFlash memory card slot
2	On/Off switch	9	CompactFlash (CF) LED
3	Slot 0 (WIC, VWIC—data only, or HWIC)	10	AIM LED
4	Console port	11	USB port
5	Fast Ethernet ports and LEDs	12	Aux port
6	KensingtonTM security slot	13	Chassis ground connection
7	Slot 1 (WIC, VWIC—data only, or HWIC)

Interface Numbering

Each individual interface (port) on a Cisco 1841 router is identified by a number. A Cisco 1841 router contains the following wide-area network (WAN) and local-area network (LAN) interface types:

•Two onboard Fast Ethernet LAN interfaces

•Two slots in which you can install WICs, VWICs (data only), and HWICs.

The numbering format for the slots is interface-type 0/slot-number/interface-number.Table 2-6summarizes the interface numbering.

Table 2-6	Interface Numbering
Slot Number		Slot Type	Slot Numbering Range	Example1
Onboard Ports		Fast Ethernet	0/0 and 0/1	interface fastethernet 0/0
Slot 0		HWIC/WIC/VWIC2	0/0/0 to 0/0/3	interface serial 0/0/0
				line async 0/0/0
Slot 1		HWIC/WIC/VWIC2	0/1/0 to 0/1/3	interface serial 0/1/0
				line async 0/1/0

1.The interfaces listed are examples only; other possible interface types are not listed.

2.VWICs are data-only in a Cisco 1841 router.

Note On the Cisco 1841 router, the numbering format for configuring an async interface is 0/slot/port. To configure the line associated with an async interface, simply use the interface number to specify the async line. For example, line 0/0/0 specifies the line associated with interface serial 0/0/0 on a WIC-2A/S in slot 0. Similarly, line 0/1/1 specifies the line associated with interface async 0/1/1 on a WIC-2AM in slot 1.

Cisco 1800 Series Routers (Modular) Hardware Installation Guide

OL-5876-03 2-9