Cisco CISCO2650 - 2650 Router Hardware Installation Manual page 108

Network modules installation guide
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Asynchronous Network Module Interface Numbering
Figure 5-4
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
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
Slot Locations and Numbering on Cisco Access Routers" section on page
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
shows the 12-in-1 Smart Serial cables going from the Cisco NM-16A/S network module to a
Cabling the Cisco NM-16AS Network Module to a Patch Panel
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Chapter 5
Connecting Serial Network Modules
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