Cisco CISCO2650 - 2650 Router Hardware Installation Manual page 174

Network modules installation guide
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Interface Numbering
Interface Numbering
Cisco IOS software identifies each modem uniquely by its slot number and port number.
Some Cisco IOS configuration commands identify asynchronous ports by an interface number (or a line
number, which is the same as the interface number). The interface number of a port on an 8- or 16-port
analog modem network module is related to the slot number where the module is installed and the
number of the port in the module.
Ports in the 8- and 16-port analog modem network modules are numbered in the same pattern as slot
numbers, beginning at 0 at the lower right and continuing from right to left and (in the 16-port module)
from bottom to top.
The interface number of a port is determined in the following way:
interface-number = (32 x slot-number) + port-number + 1
For example, modem port 12 in slot 1 corresponds to interface number (32 x 1) + 12 + 1 = 45. This is
also the line number for the port. Port 12 in slot 1 is always assigned interface number 45, regardless of
whether the module in slot 0 is an 8-port analog modem network module, a 16-port analog modem
module, or some other kind of module entirely, or even whether there is a network module in slot 0 at
all. If you move the module from slot 1 to a different slot, however, its interface numbers change.
Table 10-1
module in each router slot. (Interface 0 is automatically assigned to the console.)
Table 10-1 16- and 32-Port Analog Module Interface Numbering
Slot Number
0
1
Cisco Network Modules Hardware Installation Guide
10-4
ITU-T V.23 at 75 and 1200 bps
ITU-T V.21 at 300 bps
BELL 103 and 212a
Standardized fax protocols
ITU-T V.17
ITU-T V.29
ITU-T V.27ter
ITU-T V.21 channel 2
EIA 578 Class 2
Group 3 fax class 1 and class 2
Standardized modem error correction and compression
MNP 2 – 4
ITU-T V.42 Link Access Procedure for Modems ( LAPM)
Microcom Network Protocol (MNP) 5
V.42bis (with 4-K dictionaries)
ITU-T V.44
shows the range of interface numbers available for each type of analog modem network
Interface Numbers (8-Port Module)
1–8
33–40
Chapter 10
Connecting Analog Modem Network Modules
Interface Numbers (16-Port Module)
1–16
33–48
OL-2485-20

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