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This chapter describes 8-port and 16-port analog modem network modules for Cisco modular routers. It contains the following sections:
The following analog modem network modules originate or terminate analog telephone transmissions through RJ-11 modular jacks:
The following warning applies in Australia:
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Warning This equipment will be inoperable when main power fails. |
The following warning applies in New Zealand:
The analog modems described in this chapter support the following protocols:
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-port 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.
Cisco 3600 series slot numbering is explained in the "Cisco 3600 Series Interface Numbering" section. The Cisco 2600 series router's single network module slot is always 1.
Ports in the 8-port 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 11-1 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.)
| Slot Number | Interface Numbers (8-Port Module) | Interface Numbers (16-Port Module) |
|---|---|---|
0 | 1-8 | 1-16 |
1 | 33-40 | 33-48 |
2 | 65-72 | 65-80 |
3 | 97-104 | 97-112 |
4 | 129-136 | 129-144 |
5 | 161-168 | 161-176 |
6 | 193-200 | 193-208 |
Each analog modem network module provides 8 or 16 RJ-11 jacks for standard modular cables. These ports are color-coded pink. Cables are not provided with the network module.
To establish an analog connection, use a straight-through RJ-11 modular cable to connect the jack to a wall telephone outlet. (See Figure 11-3.)
All network modules have an enable (EN) LED. This LED indicates that the module has passed its self-tests and is available to the router.
Each modem in the module has an in use (IN USE) LED that lights when remote carrier is detected. (See Figure 11-4 and Figure 11-5.)
Posted: Fri Jun 2 16:36:33 PDT 2000
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