Cisco 3825 Hardware Installation Guide - Page 108

Asynchronous Network Module Interface Numbering Chapter 5 Connecting Serial Network Modules Figure 5-4 shows the 12-in-1 Smart Serial cables going from the Cisco NM-16A/S network module to a patch panel installed above the network module in a standard telco rack. The numbers next to the connectors on the patch panel correspond to the port number (or connector) on the other side of the patch panel. Figure 5-4 Cabling the Cisco NM-16AS Network Module to a Patch Panel Patch panel 16 DTE 8 DTE 15 DTE 7 DTE DCE DCE DCE DCE 14 DTE 6 DTE 13 DTE 5 DTE DCE DCE DCE DCE 12 DTE 4 DTE 11 DTE 3 DTE DCE NM16A/S DCE DCE DCE 10 DTE 2 DTE 9 DTE 1 DTE 15 14 DCE DCE 11 DCE 10 DCE 13 12 9 7 8 6 3 2 5 4 1 0 EN NM-16 AS network module 88373 Asynchronous Network Module Interface Numbering Certain 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 asynchronous network module is related to the slot number where the module is installed and the unit number of the port in the module. Cisco 3600 Series and Cisco MWR 1941-DC Router 16- and 32-Port Interface Numbering Cisco 3600 series and Cisco MWR 1941-DC router slot numbering is explained in the "Network Module Slot Locations and Numbering on Cisco Access Routers" section on page 1-3. Ports on the 16- and 32-port asynchronous network modules correspond to the outputs of the octal cables that connect the module to the network. These ports 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 32-port module) from bottom to top. In the 16-port module, the right connector provides ports 0 to 7, and the left connector provides ports 8 to 15, as labeled on the module rear panel. In the 32-port module, the connectors in the bottom row provide ports 0 to 7 and 8 to 15, and the connectors in the top row provide ports 16 to 23 and 24 to 31. The interface number of a port is determined using the following formula: interface-number = (32 x slot-number) + unit-number + 1 For example, asynchronous 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 a 16-port asynchronous module, a Cisco Network Modules Hardware Installation Guide 5-6 OL-2485-20