Slot Numbering; Unit Numbering; Voice Interface Numbering - Cisco 3640 Quick Start Manual

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Interface Numbering
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:
• 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.

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 23 shows a router with a 2E 2-slot module in slots 0 and 1. Two serial WAN interface cards are 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 23 Cisco 3600 Series Unit Numbers
Serial 1/0
BRI 1/0
3
2E
W1
2W
B1
B2
SEE MAN
UAL BEF BR I
ORE INS
TAL LAT ION NT1
W0
1
SER IAL
ETH ERN
ET 1
ETH ERN
ET 0
AUI
EN
Ethernet 1/1
Ethernet 1/0
Ethernet 0/1

Voice Interface Numbering

Voice interfaces are numbered as follows:
interface-type chassis-slot
For example, Slot 1, voice network module slot 0, is referred to as voice 1/0/0 (closest to chassis slot 0).
Serial 0/1
Serial 0/0
2
2E
W1
2W
SER IAL
W0
SER IAL
ETH ERN
ET 1
ETH ERN
ET 0
AUI
EN
IN PU T
10 0- 24 0V
Ethernet 0/0
Power supply
/ voice-module-slot / voice-interface
AC 50 /6
0H Z 3. 0-
1. 5 AM
PS
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