Port Numbering
10
Overview of Cisco 3800 Series Routers
OL-5966-01
Note In the Cisco 3845 router, double-wide or extended double-wide network modules are identified by slot
numbers 1 and 3.
Ports in a network module are normally numbered from right to left and bottom to top, starting at 0. See
the Cisco Network Modules Hardware Installation Guide for more information.
Interface Card Ports
Interface cards can be inserted either directly into a router slot, or into a slot in a network module.
Interface Card in Router
Interface cards inserted directly into a router slot are numbered 0/HWIC-slot/port. HWIC-slot is the
HWIC slot in the router—0, 1, 2, or 3, as labeled on the router’s rear panel; port is the port number in
the interface card. For example, port 0 of a T1 WIC inserted into router HWIC slot 3 would be identified
as t1 0/3/1.
Note Double-wide interface cards use HWIC slot numbers 1 and 3.
Ports in an interface card are normally numbered from right to left and bottom to top, starting at 0. See
the Cisco Interface Cards Installation Guide for more information.
Interface Card in Network Module
Some network modules provide their own slots for interface cards. Ports in these interface cards are
numbered router-slot/module-slot/port, where router-slot is 1 or 2 for the Cisco 3825 router and 1, 2, 3,
or 4 for the Cisco 3845 router; module-slot is the slot in the network module for the interface card; and
port is the port number in the interface card. For example, port 0 of a voice interface card in slot 1 of a
voice network module in slot 4 of a Cisco 3845 router would be identified as voice 4/1/0.
Note Double-wide or extended double-wide network modules use router slot numbers 2 and 4.
Slots in network modules for interface cards are normally numbered from right to left, starting at 0. Ports
in an interface card are normally numbered from right to left and bottom to top, starting at 0. For more
information, see the Cisco Network Modules Hardware Installation Guide and Cisco Interface Cards
Installation Guide.
Asynchronous Interface Numbering
For Cisco 3825 and Cisco 3845 routers, interface numbering for asynchronous interfaces is the same as for
other interfaces. Use the interface number to specify the asynchronous line. For example, the command
to configure port 1 of a 2-port asynchronous/synchronous WAN interface card in router HWIC slot 3 is
interface serial 0/3/1. The command to configure the line associated with this port is line 0/3/1.
Similarly, line 1/22 specifies the line associated with interface async 1/22 on a 32-port asynchronous
network module in router slot 1.
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