Commands for Automatic Configuration

This section introduces the commands used for automatic configuration.
The
modem autoconfigure type
Command

The modem autoconfigure type

modem-type
command is used to instruct the router to automatically
configure the modem attached to a port by using the commands in the modemcap database
for the modem type specified. The
modemcap database
is a listing of modem configuration
commands that provide basic information enabling the modem to operate with the router.
To show this database, use the
show modemcap
command. The output of this command is
shown next. This output provides a list of the modem types that are defined in the database.
This list is from a Cisco 2600 series router, and thus it reflects those modem types that are
included with that router image:

Router_A#
show modemcap
default
codex_3260
usr_courier
usr_sportster
hayes_optima
global_village
viva
telebit_t3000
microcom_hdms
microcom_server
nec_v34
nec_v110
nec_piafs
cisco_v110
mica

Each modem type has a related AT command-string sequence stored, which is shown with
the
show modemcap
modem-type
command. AT stands for
attention
and is the prefix for many
modem commands. The output of this command, when used for the U.S. Robotics Courier, is
as follows:

Router_A#
show modemcap usr_courier
Modemcap values for usr_courier
Factory Defaults (FD): &F
Autoanswer (AA): S0=1
Carrier detect (CD): &C1
Drop with DTR (DTR): &D2
Hardware Flowcontrol (HFL): &H1&R2
Lock DTE speed (SPD): &B1
DTE locking speed (DTE): [not set]
Best Error Control (BER): &M4
Best Compression (BCP): &K1
No Error Control (NER): &M0
No Compression (NCP): &K0
No Echo (NEC): E0
No Result Codes (NRS): Q1
Software Flowcontrol (SFL): [not set]
Caller ID (CID): [not set]
On-hook (ONH): H0
Off-hook (OFH): H1
Miscellaneous (MSC): [not set]
Template entry (TPL): default
Modem entry is built-in.

This output is similar to what would happen if you manually sent the modem the sequence
AT&FS0=1&C1&D2&H1&R2&B1. This sequence would instruct a Courier to reset its configuration
and then answer in one ring, using hardware flow control with DTR dropping and
carrier detect.
As denoted, this modem entry is included in the router’s operating system—it is built-in.
Please note that the database entry must be complete and exact. As shown in the following output,
the router will respond with an error message if the entry is abbreviated:


Router_A#show modemcap usr_cou
There is no record of modem usr_cou

In addition, the command modemcap entry modem-profile-name can be used to obtain an
abbreviated version of the output, assuming that attributes are not set.