Direct Mode Operation; Conventional Mode Operation; Telephone Interconnect Calls; Horn Alert Option - Ericsson TMX 8810 Maintenance Manual

LBI-39049
2. Momentarily press the microphone push-to-talk
(PTT) switch to acquire a channel. The display will
show WAIT momentarily. A 3 tone alert signal will
then signal when you can being the conversation. If
the "off-hook call originate" option is prepro-
grammed, the radio will automatically attempt to ac-
quire a channel when the microphone is removed from
the hanger without pressing the PTT.
A steady one second low frequency tone will sound if
the call cannot be completed due to all available
channels busy. Press the PTT again later to retry the
call.
NOTE
If the call retry option has been preprogrammed
in the radio, the radio will automatically try to
acquire a channel every 5 seconds for up to 15
times unless the area is changed or an out-of-
range condition occurs.
A sequence of five beeps will sound if the radio cannot
access a channel due to being out of range of the
GE-MARC system or an inoperative radio. Any sub-
sequent call request will be ignored for 20 seconds.
However, if the area is changed, a call request may be
initiated in the new area.
RECEIVING A CALL
(TRUNKED MODE OPERATION)
When a call is received by the radio, alert tones are sounded
to inform the user of the incoming call (unless the "mute
received alert tone" option has been preprogrammed).
A single tone alert indicates a group call. A two tone alert
indicates call. The display will flash the area and group of the
received call. Press the microphone PTT to answer the incom-
ing call.
Incoming telephone interconnect calls will be indicated
with a two tone alert followed by telephone ringing tones. The
display will show an individual decode call. Press the micro-
phone PTT to answer the call.
ENDING A CALL (TRUNKED MODE OPERA-
TION)
The call can be ended in one of three ways:
a. pressing the CLR/MON key,
8
b. returning the microphone to the hanger (if the prepro-
grammed option "on-hook call terminate" is enabled),
or
c. waiting for a channel disconnect or system time-out
after 6 seconds of no channel activity (PTT).
NOTE
If a channel disconnect occurs before the conversa-
tion has ended, the call must be initiated again. To
avoid confusion, a procedure should be set up so that
the originator of the call is the one designated to
re-establish communications. Two or more operators
originating a call simultaneously may acquire two
different channels making communication impossi-
ble.

DIRECT MODE OPERATION

The Direct Mode provides short range, line of sight com-
munications. In the Direct Mode, the radio is not operational
on the GE-MARC System.
1. Press the AREA UP or DOWN keys to select the
direct mode area. The GROUP keys have no affect in
the Direct Mode.
2. Before making a call, determine if the channel is in
use. Press CLR/MON to momentarily disable the
squelch to monitor the channel. Also, removing the
microphone from the hanger allows you to monitor
the channel without disabling the squelch (Busy Tone
is disabled). The BSY indicator in the display will also
show is the channel is in use.

CONVENTIONAL MODE OPERATION

1. Press the AREA UP or DOWN keys to select the
conventional mode area. If more than one channel is
available in the conventional area, press the GROUP
UP or DOWN keys to select the channel (up to 9
channels may be available in one conventional area).
2. Before making a call, determine if the channel is busy.
Press CLR/MON to momentarily disable the squelch
to monitor the channel for any activity. Also, remov-
ing the microphone from the hanger allows you to
monitor the channel without disabling the squelch
(Channel Guard is disabled). The BSY indicator in the
display will also show if the channel is in use.

TELEPHONE INTERCONNECT CALLS

The radio may be preprogrammed with up to 10 telephone
numbers. Each dialer number may contain up to 15 digits. Place
a Telephone Interconnect Call as follows:
1. Select the AREA and GROUP which are valid for inter-
connect calls. If the SPECIAL CALL (SPC) feature is
desired in trunked mode, select the area followed by
simultaneously pressing MENU and then GROUP UP.
The display will show SPC after the area name. If the
area has no programmed groups, SPC selection is auto-
matic.
2. Momentarily press the MENU key. If ALARM appears
in the display, press MENU a second time until PHONE
appears. PHONE will remain in the display for one
second and then the telephone number which was last
selected will be displayed. Use the GROUP UP or
GROUP DOWN keys to step to the desired telephone
number. If you desire to cancel the PHONE mode, press
CLR/MON at any time to reset the display to the current
area/group.
NOTE
If a number contains more than 7 digits, the radio
displays the first digits of the number for one
second followed by displaying the last 7 digits.
3. With the desired phone number in the display, momen-
tarily press the microphone PTT. The radio will acquire
a channel and dial the number. When using the trunked
mode, the radio will give the same alert tones to show if
a channel was not available as described under the
section PLACING A DISPATCH CALL (TRUNKED
MODE OPERATION).
NOTE
After dialing the first number, if another number
must now be sent (for credit card calls, etc.), first
press MENU, select the other number using GROUP
UP or DOWN, and then momentarily press the mi-
crophone PTT.
4. To end a call, momentarily push CLR/MON once to
disconnect the telephone interconnect only. If desired,
another interconnect call may now be placed before the
system times out in 6 seconds by pressing MENU and
selecting the number. Push CLR/MON a second time to
disconnect from the system immediately.
NOTE
When the radio is first turned on, momentarily press-
ing MENU will always select ALARM first. Press-
ing MENU a second time will select the PHONE
mode with the first of the 10 dialer numbers. While
operating the radio, the radio will remember the
menu mode and the dialer number last selected.
However, after the radio is turned off, the menu mode
will again be ALARM and the dialer number will be
the first in the list.

HORN ALERT OPTION

If the Horn Alert Option is present, the radio can be prepro-
grammed to beep the vehicle horn when a call is received (in
trunked mode operation only).
To enable the Horn Alert Option, momentarily press the
MENU key until ALARM appears in the display. (If PHONE
appears, press MENU a second time). Use the GROUP UP or
GROUP DOWN keys to toggle between Y or N (Yes or No) to
enable or disable the alarm.
If desired, after enabling the alarm, press the CLR/MON key
to leave the menu mode and return the display to the current
area/group. The alarm will re-main enabled on the area/group
selected in the display.
With the alarm enabled, when a call is received, the radio will
first sound a pulsed alert warning tone for three seconds and then
begin blowing the horn five times (one second on, three seconds
off, for 20 seconds). Pressing the microphone PTT during the
pulsed alert tone will prevent blowing the horn. The horn alert
will remain enabled for subsequent calls.

MAINTENANCE

This section contains information required to service the
radio. Included are preventive maintenance checks, procedures
for replacing transistors, Integrated Circuits (ICs) and chip com-
ponents. Refer to the Service Section for transmitter and receiver
alignment procedures, and service checks for the transmitter and
receiver.
INITIAL ADJUSTMENT
After the radio has been installed (as described in the Instal-
lation Manual), the following adjustments should be made by a
certified electronics technician.