Cisco 3825 Hardware Installation Guide - Page 174
Interface Numbering
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Interface Numbering Chapter 10 Connecting Analog Modem Network Modules - 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 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 shows the range of interface numbers available for each type of analog modem network 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 Interface Numbers (8-Port Module) 1-8 33-40 Interface Numbers (16-Port Module) 1-16 33-48 10-4 Cisco Network Modules Hardware Installation Guide OL-2485-20