Ericsson LBI-38848D manual Radio Operation, Alert Tones, User Interface, Edacs Applications

LBI-38848D

In a two-tone call, the mobile sends the collected tone for a programmable duration. In the four-tone call, the mo- bile always sends a 90-millisecond collect tone which the repeater regenerates and sends for the correct duration.

Group/Individual Tones

Group/Individual Tones chosen from the 34 standard frequencies follow the collect tone. In a two-tone call, the second tone is sent for 450 milliseconds. In a four-tone call, the second, third, and fourth tones are sent for 90 millisec- onds from the mobile and 180 milliseconds from the re- peater.

RADIO OPERATION

A complete set of operating instructions for the Dual Format MDX are provided in LBI-38846 and are provided with each radio.

This radio is flexible in operation and can be used in any of three operating modes: Conventional radio system, En- hanced Digital Access Communications (EDACS) system, or GE-MARC (tone controlled) system. Either of the latter two systems provide trunked channel selection for increased channel utilization.

In an EDACS trunked environment, the user selects a communications system and group. In this mode, audio channel selection is transparent to the user and is controlled via digital communication with the system controller. This mode incorporates advanced programmable features and fast access to communication channels.

In a GE-MARC trunked environment, the user selects a communications area and group. In this mode, audio channel selection is also transparent to the user and is controlled via tone signalling.

In Conventional mode, the user selects a channel and communicates on that channel. In this mode, a system refers to a set of channels and a channel is a transmit/receive radio frequency pair.

The exact operation of any radio depends upon the operating mode, the programming of the radio and the par- ticular radio system. Most features described in these oper- ating instructions can be enabled or disabled through programming. Both of these important factors must be con- sidered when addressing the following instructions.

USER INTERFACE

Operating controls are located on the radio front panel and microphone.

The front panel LCD provides radio status and commu- nication control information to the operator. The keypad is used for manual number entry for individual calls access to a telephone interconnect system and activation of various EDACS, GE-MARC, and conventional features.

Turning The Radio ON/OFF

The radio is turned ON/OFF by pressing the PWR button in the upper left corner of the front panel. A self diagnostic test is performed when the radio is first turned on if enabled through programming. To turn the radio OFF, press the PWR button again.

ALERT TONES

The Dual Format MDX™ radio generates a set of unique alert tones to indicate operating status. The following section identifies and describes the alert tones used in the Dual Format MDX™ radio for Conventional, GE-MARC, and EDACS applications.

EDACS APPLICATIONS

CALL	If programmed, a short tone is sounded
ORIGINATE	whenever the Push-To-Talk key is
ALERT	pressed and the radio has acquired a
	channel. This tone indicates the user can
	begin communications.
CALL QUEUED	If one short, high-pitched tone sounds
	after the transmitter is keyed, this indi-
	cates that the system has placed the re-
	quest in a queue. This tone sounds at both
	the transmitting unit and the receiving
	unit(s) indicating to the user on the re-
	ceiving end that a call is being directed
	to them. If the PTT is unkeyed while in
	the queue, the radio autokeys (automat-
	ically keys) Push-To-Talk when a chan-
	nel becomes available (see AUTOKEY).
AUTOKEY	When the PTT is keyed to place a call on
	the system, but the PTT is released be-
	fore getting to the channel (e.g. a queued
	call), the radio automatically keys on the
	channel when it gets the assignment. The
	radio generates a long beep and holds the
	transmitter keyed for two seconds. Press-
	ing the PTT button keeps the channel and
	sends the message before this two sec-
	ond time-out has expired.
SYSTEM BUSY	If you press the PTT key and hear three
	short, medium-pitched tones, this indi-
	cates that the receiving party is already
	on the system or the system is busy and
	its queue is full. You must rekey later to
	access the system.
CALL DENIED	A single, low-pitched beep sounds when
	the PTT key is pressed and the request is
	denied by the system. This happens if the

	unit is an invalid user or if the unit is	CARRIER	(GE-MARC and Conventional operation.)
	requesting an unavailable service.	CONTROL	A pulsed-tone signal is sounded for a pre-
OUT-OF-	A single, low-pitched tone sounds immedi-	TIMER	programmed time after PTT is pressed. Af-
			ter nine seconds of pulsing the alert tone,
RANGE/	ately after the PTT key is pressed indicat-		the radio unkeys the transmitter and com-
SYSTEM	ing the radio is out of range of the repeater.		munications are interrupted. While the tone
INOPERATIVE	The radio tries to place the call for a short		is pulsing, the user can release and press
	period (3 seconds) after the initial attempt.		PTT again to reset the timer and resume the
	The radio generates a second low-pitched		conversation. In the conventional mode,
	tone when it gives up trying to place the		the radio unkeys and beeps until PTT is
	call. These tones are also heard if the sys-		released.
	tem is off the air or the radio needs servic-	SYSTEM	The GE MARC radio may generate other
	ing (even when the radio is within calling
	range of the repeater).	TONES	system tones to alert the user of custom
			programmed events. Contact the GE-
GE-MARC APPLICATIONS			MARC system operator for details about
			these alert tones.
CALL	If programmed, a single alert tone sounds
RECEIVED	when a group call is received and a two-
ALERT	tone alert (one high followed by one low
	tone) sounds for an individual call.
CALL	WAIT momentarily displays when a call is
ORIGINATE	being placed. Then a three-tone alert is
ALERT	sounded to indicate the call origination is
	complete. This indicates a channel was ac-
	quired and is ready for normal conversa-
	tion.
INVALID CALL	A low-frequency tone is sounded for one
ORIGINATE	second immediately after pressing PTT and
ALERT	the display does not show WAIT. This in-
	dicates a call was attempted within a group
	that is not enabled for call originate or an
	invalid dispatch overdial call was at-
	tempted.
SYSTEM	A low-frequency tone is sounded for one
TONES	second after attempting to place a trunked
	call and BUSY is displayed. This indicates
	that the GE-MARC system is busy. If the
	"Call Retry" option has been enabled
	through programming, the radio retries at
	5 second intervals up to 15 times unless
	END is pressed, a channel is acquired, or
	an out-of-range condition occurs.
OUT-OF-	If NO SVC is displayed and five beeps are
RANGE	sounded after attempting to place a trunked
ALERT	call, the radio is out of range of the GE-
	MARC system. If the beeps sound when
	the radio is within known range of the

system, the radio may need servicing. If the "Call Retry" is active, the radio tries the channel at twenty second intervals for five minutes.

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