Chapter 6: Calling the T-311
This chapter provides instructions for callers using a remote telephone to place calls into a T-311
through a computer.
Table 3, below, explains the three tones you will hear when working with the T-311.
Table 3 Audible Prompts
Name
Description
Explanation
Connection tone
Extended single burst
Security disabled: T-311 has answered.
Security enabled: T-311 has answered. Enter
password.
Acknowledgment tone
Brief single burst of DTMF A for
duration set in S11 register
Security check has passed.
Error tone
Triple burst of DTMF D at on/off rate
set in S11 register
Security check has failed. T-311 will disconnect.
Step 1: Dial up the T-311
•
Dial the telephone number to which the T-311 is connected. Although a pulse-dialing telephone
may be used to call the T-311, a DTMF telephone (or a DTMF generator used with a pulse-dialing
telephone) must be used to enter the password (if required) and communicate with the computer
after the connection through the T-311 is established.
To call from another T-311, enter ATDn...n<CR> where n...n is the telephone number
Step 2: (Optional) Enter password
•
When ringback tone is heard followed by a single burst of connection tone, enter the assigned
password.
n...n# where n...n is the password
Remember to terminate the code with a “#”. You have 4 seconds to enter each digit.
If the correct password is entered in the allotted time, the T-311 responds with a burst of acknowl-
edgment tone (see Table 3) and the connection is established. If the password is incorrect, or if
the correct password is not entered in the allotted time, the T-311 responds with three short bursts
of error tone and then disconnects.
Step 3: Communicate with the computer
After the connection is established, DTMF digits you transmit via your telephone keypad are detected
by the T-311 and forwarded to the computer as ASCII characters.
Depending on the application, the computer can be programmed to respond to your input in two ways:
•
By issuing ASCII characters which the T-311 converts to the corresponding DTMF tones and for-
wards to you.
•
By controlling an audio source such as a speech synthesizer or recorded tape player, the output of
which the T-311 couples onto the line.
Step 4: Hang up
When you have completed your call, hang up the telephone. You can program the T-311 to disconnect
automatically in any of the following ways:
Reference Manual
Chapter 6: Calling the T-311
40-400-00045, Rev.
B
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