Telenetics 56 - Manual (Page 27)

Using the Modem’s Auto-Connect Feature
Page 19
Chapter 4
Using the Modem’s Auto-Connect Feature
Your Premier 56 modem can emulate a leased-line connection over the Public Switched Telephone
Network (PSTN). Using the $DL command, you can configure the modem to work similarly to the
“always connected” functionality used with leased lines. This feature is useful in environments where a
leased line is not available or is cost prohibitive. In certain environments, this feature is more robust in
recovering from network failures.
When the $DL command is used, your Premier 56 modem automatically dials the first of four telephone
numbers you have stored using the &Zn=x command. If the call fails or is disconnected, your modem
waits a user-defined number of seconds before redialing the number. If the redialing attempt fails to
make a connection (for example, if the number dialed is busy or the called modem does not answer),
your modem automatically dials the next number stored with the &Zn=x command. The modem repeats
this round-robin method until a dialed number results in a data connection.
Storing Telephone Numbers
Before you use the &Zn=x command, store up to four telephone numbers in your modem’s nonvolatile
memory. These are the telephone numbers your modem automatically dials when it executes an $DL
command.
In the command &Zn=x, n is a decimal number from 0 to 3 that corresponds to a location in the
modem’s nonvolatile memory and x is a dial string up to 31 characters long. The following examples
show how to store sample dial strings in the modem’s nonvolatile memory.
Example Description
AT&Z0=5551212 Stores dial string 5551212 in nonvolatile memory location 0.
AT&Z1=9,19495551234 Stores dial string 9,19495551234 in nonvolatile memory location 1.
AT&Z2=T9,P5552468 Stores dial string AT&Z2=T9,P5552468 in nonvolatile memory
location 2.
AT&Z3=9,5552468 Stores dial string AT&Z3=9,5552468 in nonvolatile memory location
2.