Interface Numbering On The 1861 Integrated Services Router - Cisco 1841 - 3G Bundle Router Hardware Installation Manual

Interface Numbering on the 1861 Integrated Services Router

Interface Numbering on the 1861 Integrated Services Router

Each interface (port) on a Cisco 1861 ISR is identified by a number. The Cisco 1861 router contains the
following WANLAN interface types:
•
•
•
•
•
The numbering format for the slots is interface-type 0/slot-number/port-number.
the interface numbering.
Table 2-7
Slot Number
Onboard Ports
Onboad Slot 1
Fixed HWIC slot 0
Fixed HWIC slot 1
Modular HWIC Slot
1. The interfaces listed are examples only; other possible interface types are not listed.
On the Cisco 1861 ISR, the numbering format for configuring an asynchronous, or async, interface is
Note
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.
If you have specified the use of a private line automatic ringdown (PLAR) off-premises extension (OPX)
Note
connection mode for an FXO voice port (with loop resistance less than 8000 Ohm), you must ensure
that the soft-offhook option is enabled on the port.
This option allows a stepped offhook resistance during seizure, which avoids overloading the circuit
during offhook in the event that ringing voltage is present on the circuit at the same time as the trunk
seizure. The stepped offhook resistance is initially set to 800 Ohms, then adjusts to 50 Ohms when
ringing voltage is not present.
To enable the soft-offhook command on the port, and to access the connection command with plar opx
syntax, see
Cisco 1800 Series Routers (Modular) Hardware Installation Guide
2-10
One onboard Fast Ethernet LAN interface (FastEthernet0/0)
One onboard Ethernet switch
One fixed VIC slot with 4 FXS ports
One fixed VIC slot with 4 FXO or 2 BRI ports
One modular HWIC/WIC/VWIC slot
Interface Numbering
Slot Type
Fast Ethernet
Fast Ethernet Switch
FXS
FXO
BRI
HWIC/WIC/VWIC
Cisco Command Lookup
Chapter 2 Overview of Cisco 1800 Series Routers (Modular)
Slot Numbering Range
0/0
0/1/0 to 0/1/7
0/0/0 to 0/0/3
0/1/0 to 0/1/3
0/1/0 to 0/1/1
0/3/0 to 0/3/x, where x
depends on the
card-type.
Tool.
Table 2-7 summarizes
1
Example
interface fastethernet 0/0
interface fastethernet 0/1/0
voice-port 0/0/0/
voice-port 0/1/0
interface serial 0/0/0
OL-5876-03