Midian TRA, Instruction Manual

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5
2.3.3. A
NSWERING
C
ALLS FOR
R
ADIOTELEPHONE
A
PPLICATIONS
When a unit is called, the TRA generates a 70V RMS ring
signal that activates the bell on the telephone. The TRA
tip/ring is capable of ringing several phones. When the
phone is taken off hook, only voice is transmitted when
the RTI-800 Interconnect is used. Other terminals require
ANI when the TRA comes off hook. When the phone is
placed back on hook, the disconnect ANI is transmitted to
the mobile telephone terminal thereby terminating the call.
3. P
ROGRAMMABLE
F
EATURES
See programming worksheet, pages 13-14.
3.1. Decode Numbers
When the DTMF, Five-Tone or Two-Tone decoder (as
programmed in
Decode Format & Tone Detect Time )
receives a number it compares it with Decode Numbers
1, 2, and 3. Each location holds up to 8 digits followed by
a special code that determines the unit's response. The
decode digits may be any DTMF tone pair. The ring code
must be one of the following:
1 - Standard telephone ring, ANI when answered
2 - Standard telephone ring, no ANI when answered
7 - 30 second key up for locating stolen radio
8 - Reset internal test call lamp and call reminder tone
9 - Unit deadbeat disable (see below)
If a match is found the unit will do one of the following:
a) Begin ringing (codes 1 and 2).
b) Key transmitter for 30 seconds (code 7).
c) Reset internal test call lamp and call reminder tone
(code 8).
d) Change deadbeat disable status (code 9).
When the unit begins ringing it will continue to do so until
the phone is taken off hook, the carrier is lost, the
preprogrammed ring time has elapsed, or a DTMF A tone
is received, which resets the TRA. If the call is not
answered, a single short ring pulse will be generated
every 1 to 99 seconds, depending on the setting in
Call
Reminder Interval , to alert the user that a call was
received during his absence. This feature can be reset by
quickly taking the receiver off and on hook (800 msec
flash).
In the RTX-compatible format, the TRA decoder uses the
DTMF digits A and D in the following manner. The
scanner looks for a D collect tone at the start of the
decode sequence. All other digits are ignored until a D
tone is received. Upon receipt of a 150 msec A tone, the
TRA will remute and resume scanning.
Ring code 7, when assigned to a decode register, will
send back a 30 second carrier for triangulation on a lost or
stolen unit. Ring code 9, when assigned to a register, will
disable the VOX/PTT output function, preventing the user
from keying up on a channel, and it will mute the receive
audio. The unit is still capable of decoding a phone
number in order to reset the deadbeat disable feature.
3.2. Connect & Disconnect ANI
The Automatic Number Identification locations contain the
connect and disconnect ANI sequences. There is an
entry for
Connect ANI , and one for Disconnect ANI.
Each location can be programmed with 0 to 8 digits.
The RTX-compatible format requires a * or a # in front of
the ANI or in place of the ANI. If the * or # is in front of the
ANI, it will be sent at the same speed as the ANI is
programmed. If the * or # is used in place of the ANI, it
will be sent for the time programmed in
Single Digit Tone
Time .
3.3. Transpond ANI
Transpond ANI can be programmed in this location for a
0 to 8 digit transpond sequence. The unit will send this
sequence after decoding a number and prior to ringing.
Note that the TRA transponds on
Decode Number 1
(Individual Call) only. There is no transpond on Decode
Numbers 2 and 3, which are usually used for Group Call
and All Call, because this would cause "mid air collisions"
of the transpond tone.
3.4. ANI & Secondary Dialing Format
ANI & Secondary Dialing Format control the ANI format
and timing for the first tone and subsequent tones.
•
Number of Digits: This determines whether this
format will be used for the dialing format. (See
Primary Dialing Format, below, for additional
information.
•
ANI Format: Choose this from the ANI, Dial,
Transpond, and Decode Modes Table.
•
Time 1: This setting controls the duration of tone 1.
A separate first tone timing makes it possible to
create a preamble tone. If nothing is entered in the
first timing field, the unit will default to the industry
standard timings for that format.
•
Time 2: This setting controls the duration of tone 2.
If a time is entered in Time1 but nothing is entered
in Time2 , the unit will encode all tones for the
timing entered in Time1 .
3.5. Primary Dialing Format
The dialing format is programmed here in the same
manner as the ANI format. Choose a format from the
ANI, Dial, Transpond, and Decode Modes Table and set
the desired tone timings.
When a keyboard sequence is entered, the TRA first looks
at the number of digits entered and compares this number
to the
Number of Digits value entered here. If the length
of the entered sequence matches this, and Primary
Dialing Format contains a valid format, then the primary
dialing format is used to encode the sequence. If the
length of the entered sequence does not match required
number of digits, then the length is compared with the
Number of Digits value in ANI & Secondary Dialing
Format . If a match occurs, the secondary format is used
to encode the sequence. If the length of the entered
sequence does not match either setting, an error tone
prompt is returned and the TRA waits for another to be re-