Midian TRA, Instruction Manual

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entered. A length of 0 in either location will allow you to
dial any length sequence. You cannot have a 0 in both
locations if you are doing dual type dialing. The primary
dialing format
Number of Digits must be set to a defined
length and the secondary dialing format Number of Digits
, when programmed to a 0, can send any length from 1-11
digits.
The TRA uses the number of digits entered before the
user presses * or the
Auto Dial Time expires. For
example, a system could have the following settings:
Primary Dialing Format Number of Digits: 4
Primary Dialing Format: 1 (DTMF format)
ANI & Secondary Dialing Format # of Digits: 5
ANI & Secondary Dialing Format: 50 (CCIR format)
In this case, if four digits are keyed into the telephone, the
TRA will dial in the primary format
⎯
DTMF. If five digits
are entered on the keyboard, the TRA will dial in CCIR
format
⎯
the secondary dialing format.
3.6. Transpond Format
The transpond format and tone lengths are programmed
in the same manner as the ANI and Dialing formats. (See
above)
3.7. Decode Format & Tone Detect Time
Choose a Decode Format from the ANI, Dial,
Transpond, and Decode Modes Table and set the
desired Tone Detect Time here. (See Table 4.) The
decoder uses a sampling and averaging technique to
improve the signal to noise ratio.
Therefore, the decode
tone detect time for formats other than DTMF should be
set at 1/4 to 1/5 the encode tone timings and should be
set in increments of 5 ms
. For example, if the encode
timings are set to 20 ms, the decode timings should be set
to 5 ms; if the encode timings are set to 100 ms, the
decode timings should be 20 to 25 ms.
If DTMF is chosen for the decode format, then Time 1
determines the maximum inter-digit time between tones,
not the detect time as used in five-tone or two-tone. This
prevents falsing between short and long codes. When the
tone disappears, the gap time is measured. If another
digit arrives before the time has elapsed, it is appended to
the decode buffer. An incoming DTMF sequence isn't
compared to any Decode Numbers until the last tone has
been received. This prevents falsing on longer numbers
(i.e., decode number 1234 will not respond to 12345.) Set
up a long timeout of 1 second or more if decoding manual
dialing.
3.8. Transmit Parameters
Transmit parameters control the operation of the TRA
during a call.
•
Trunking Delay: This determines the period the
TRA will delay after initial keyup before transmitting
the ANI to allow the TRA-equipped trunked radio to
find and to connect to a channel with an
interconnect for TRA-to-Landline conversations.
•
Front Porch/Lead-In Delay: This determines the
period of time the TRA will wait with no modulation
after applying PTT and before encoding the ANI or
dialing sequence. This gives the repeater or base
time to open and pass audio.
•
Back Porch/Lead-Out Delay: This determines the
period of time the TRA will wait with no modulation
after sending the ANI or dialing sequence before
releasing the PTT. This feature is necessary in
Basic's RT5 and RT6 Terminal.
•
Single Digit Tone Time: This sets the encode
length of any single digit during ANI or dialing. (For
example * up, # down)
•
COR Refresh Period and COR Refresh Width:
These settings respectively set the length of time
between transmission bursts and the width of the
burst used to prevent some full-duplex systems
from disconnecting a half-duplex or simplex user
while listening to the phone line side of the
conversation. This is usually unnecessary in Touch
Tone interconnects.
•
Dialing Enabled: This can be set to inhibit dialing
for Voice Call, Decode Only, and Tone & DC
remote applications. When the phone is taken
offhook, the TRA automatically keys the transmitter
and then transmits its ANI after waiting for the time
set in
Front Porch Lead-In Delay . The micro then
unkeys, allowing the simplex mobile to hear dial
tone. At this time, the user can enter the desired
number on the telephone Touch Tone pad.
•
Auto Dial Time: This can be used to set a fixed
period of time after which the TRA will automatically
send a pre-entered string of digits. Thus, if during
the keyboard entry of the dialing sequence, the
user has not pressed any more keys within the auto
dial time, the TRA will automatically send the digits
entered instead of waiting for a * to instantly start
dialing. In the duplex mode, the transmitter does
not unkey, and the receiver is able to hear dial
tone.
3.9. Decoding Parameters
Decoding parameters control the operation of the TRA
after a number has been decoded.
•
Ring Period: This controls the length of time the
unit rings. The unit ANI’s on the "busy" channel
during the ring interval.
•
Horn Period : This controls the length of time that
an optional horn/external bell will energize. The
unit ANI’s on the "busy" channel during the ring
interval.
In the TRA, there is an additional decoding format called
N-click . This format is normally used for In-plant Paging
systems. N-click allows a user to click the PTT of a
mobile or handheld several times rapidly, which is
received as a logic-state change on the COR Input of the
TRA. This, in turn, can be used to ring an operator or
receptionist.
•
N-Click Decode: This programs the number of
clicks needed to activate the ringer.