Ericsson MDX LBI-39014A, Руководство по обслуживанию

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The Public Address microphone audio normally feeds an
external speaker. An ON/OFF switch, which is mounted on
or near the radio, allows selecting either the internal or exter-
nal speaker for the receiver audio. The ON/OFF switch
turns the receiver audio on or off to the external speaker.
This switch still functions for the receiver audio with the PA
option disabled.
TYPE 99 OPTION OPERATION
If the Type 99 option is present, selective calling is possi-
ble. Press the programmed flex key or scroll through the
menu to select the T99 decoder option (Scan must be off).
The LED display will show "T99 ON" or "T99 OFF" for 2
seconds (PC programmable). During that time subsequent
pressing of the flex key or Group/SEL buttons will toggle
the T99 state between OFF and ON.
When a T99 call is received, the entire display will alter-
nate between "T99" and the normal channel display and an
alert tone will sound. If a call has been received and the dis-
play is flashing, CLR must be pressed before the T99 option
can be turned off.
DETAILED TYPE 99 OPERATION
AND PROGRAMMING
The optional Type 99 Control Panel provides individual,
group and super group call decode. The Motorola Formatted
two-tone sequential signaling schemes can also be decode.
In Type 99 Tone systems, calls will not be heard from the
receiver until the proper two tones are detected. When the
second tone is decoded and recognized as correct, an alert
tone sounds during the remaining portion of the second tone.
The receiver audio path opens and remains open to receive
messages until the decoder is reset. The display will also
flash to show a call has been received.
The MDX radio can be PC programmed with up to three
separate tables of tones. Either the Ericsson GE Type 99 for-
mat or the Motorola format can be assigned to each tone ta-
ble. The tone decoder can be enabled individually for each
channel. Once enabled, one of the three tone tables can be
selected for each channel. After choosing a tone table, the
call formats must be specified: Individual, Group and Super
Group for the Ericsson GE format or Individual, Group and
Quick-Call for the Motorola format.
The Group Call format allows communications with all
radios within a subgroup. The Super Group call (in Ericsson
GE tone system or Quick-Call (In Motorola tone systems)
allows communication between all radios in a system.
ERICSSON GE TYPE 99 FORMAT
Tone frequencies in the Ericsson GE tone system fall
within the range of 517.5 to 997.5 Hz.
In the Ericsson GE tone format, the first tone may be
from tone group A (for individual or Group calls) or from
tone group C (for Super Group calls). The second tone may
be from tone group B (for individual calls) or from tone
group D (for Group and Super Group calls). The Ericsson
GE tone format is illustrated as follows:
ERICSSON GE TYPE 99 FORMAT
INDIVIDUAL CALL FORMAT
<----1.0 SEC---->
±
20%
TONE A
<----200 MS---->
±
25%
GAP
<----1.0 SEC---->
+300% -0%
TONE B
GROUP CALL FORMAT
<----1.0 SEC---->
±
20%
TONE A
<----200 MS---->
±
25%
GAP
<----1.0 SEC---->
+300% -0%
TONE D
SUPER GROUP CALL FORMAT
<----1.0 SEC---->
±
20%
TONE C
<----200 MS---->
±
25%
GAP
<----1.0 SEC---->
+300% -0%
TONE D
For example, assume the paging number to be 123. The
first digit of the paging number is a 1. Look in Table 3 and
read down the column labeled "100’s Digits" to a 1. Read
horizontally across to the column labeled "10’s Digit". The
tone group is B. The second digit of the paging number is a 2.
The tone number is B2. Look in Table 3 and down the column
labeled "Tone Designator" to find B2. Read horizontally
across to the column labeled "Tone Frequency". The first tone
frequency is 787.5 Hz.
To determine the second tone frequency look in Table 3 and
as before, find the first digit of the paging number.
The second tone group is A. The third digit of the paging
number is a 3 and the Tone Designator is A3. In Table 3 read
down the column labeled "Tone designator" and find A3.
Read horizontally across to the column labeled "Tone Fre-
quency". The second tone frequency is 802.5 Hz.
For different paging numbers, locate the first digit in the
"100’s Digit" column and determine the tone frequencies as
described in the example. For a complete description of tone
applications see DATAFILE BULLETIN DF-5000-3A.
Tone D is the diagonal tone used (Ericsson GE tone sys-
tems only) when the first and second tone frequencies are the
same. The standard frequency for Tone D is 742.5 Hz, but may
be programmed with any tone frequency.
Table 3 - Tone Groups
100’s DIGIT 10’s DIGIT 1’s DIGIT
For 1st Tone For 2nd Tone
0 A A
1 B A
2 B B
3 A B
4 C C
5 C A
6 C B
7 A C
8 B C
9 Not Used
Table 4 - Tone Generator Frequencies
TONE
GROUP
TONE
DESIGNATOR
TONE
FREQUENCIES
A
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9 682.5 Hz
592.5 Hz
757.5 Hz
802.5 Hz
847.5 Hz
892.5 Hz
937.5 Hz
547.5 Hz
727.5 Hz
637.5 Hz
B
B0
B1
B2
B3
B4
B5
B6
B7
B8
B9 652.5 Hz
607.5 Hz
787.5 Hz
823.5 Hz
877.5 Hz
922.5 Hz
967.5 Hz
517.5 Hz
562.5 Hz
697.5 Hz
C
C0
C1
C2
C3
C4
C5
C6
C7
C8
C9 667.5 Hz
712.5 Hz
772.5 Hz
817.5 Hz
862.5 Hz
907.5 Hz
952.5 Hz
532.5 Hz
577.5 Hz
622.5 Hz
Diagonal Tone 742.5 Hz
MOTOROLA FORMAT
Tone Frequencies in the Motorola tone system fall within
the range 288.5 to 1433.4 Hz.
A round-off error will occur when entering the tone
frequencies. This error is less than 0.2% and will not
cause any decoding problems. For example, it the
standard tone frequency of 517.5 Hz is entered, the
actual decoder frequency will be 517.4 Hz. This new
frequency will appear on the screen in the tone ta-
bles.
NOTE
Tone frequencies above 1000 Hz must be rounded off
to the nearest Hz when programming the tone tables.
For example, the standard tone frequency of 1153.4 Hz
must be entered as 1153 Hz. Also, the program will
cause a round-off error of
±
0.2 Hz for frequencies be-
low 1000 Hz. These errors will not cause any decoding
problems.
NOTE
LBI-39014A
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