Telit Wireless Solutions GM862GPS Series User manual

TELIT GM862-GPS
Quad Band GPS Data Terminal Module
TECHNICAL
MANUAL
Code: 1vv0300730
Rev. 0
May. 20, 2006

TECHNICAL MANUAL
Telit GM862-GPS
Quad Band GPS Data Terminal Module
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REVISION INDEX
REV. SUBJECT OF MODIFICATION DATE

TECHNICAL MANUAL
Telit GM862-GPS
Quad Band GPS Data Terminal Module
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MASTER INDEX
1INTRODUCTION ................................................................................... 4
2MECHANICAL VIEW ............................................................................ 6
2.1 Mechanical view of Telit GM862-GPS module................................................................. 6
3TECHNICAL SPECIFICATIONS........................................................... 7
3.1 GM862-GPS Transceiver Module..................................................................................... 8
3.2 Environmental requirements ........................................................................................... 11
3.3 Transceiver module interface connectors ....................................................................... 12
3.4 Audio levels specifications .............................................................................................. 13
3.5 Interface connector.......................................................................................................... 15
3.6 Mechanical characteristics.............................................................................................. 18
3.7 GM862-GPS Data Terminal System............................................................................... 19
3.8 EMC ................................................................................................................................ 22
3.9 Camera support............................................................................................................... 22
3.10 Software Features........................................................................................................... 23
3.11 Jammed Detect & Report Extension............................................................................... 30
3.12 Easy Script Extension - Python interpreter...................................................................... 31
3.13 Python implementation description ................................................................................. 33
3.14 AT Commands ................................................................................................................ 50
3.15 GPS Receiver characteristic ........................................................................................... 55
3.16 Conformity Assessment Issues...................................................................................... 57

TECHNICAL MANUAL
Telit GM862-GPS
Quad Band GPS Data Terminal Module
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1 INTRODUCTION
The Telit GM862-GPS Quad Band GSM-GPRS Data Terminal Module is a small,
lightweight and low power consumption device that allow digital communication services
wherever there is a GSM - GPRS 850 MHz, 900 MHz, 1800 MHz or PCS 1900 MHz
network with an integrated GPS receiver.
The Telit GM862-GPS includes a 20 channels GPS receiver. It provides all the features of
the Telit GM862 family versions such as Voice, Circuit Switched Data transfer,
Phonebook, SMS, four bands GSM capability, hot removal sensing on board SIM Reader,
GPRS Class 10 and battery charger circuitry.
Moreover, the Telit GM862-GPS integrates the “EASY SCRIPT “ functionality. This is a
PYTHON engine script interpreter allowing self-controlled operations.
It is specifically designed and developed for OEM usage and dedicated to portable data,
voice and telematics applications needing the added triband and GPRS Class 10
improved speed features and the battery charger such as:
• Fast Worldwide GPRS Telemetry and Telecontrol (SCADA applications)
• Worldwide Smart GPRS Security systems
• Worldwide Smart GPRS Vending machines
• Fast Worldwide GPRS POS terminals
• Worldwide PDAs
• Worldwide Phones and Payphones
• Worldwide Smart Automotive and Fleet Management applications
• Battery powered applications needing a battery charger
Moreover, for the GM862-GPS:
• Automotive and Fleet Management applications
• Position reporting and tracking
The Telit GM862-GPS module is specifically designed and developed for OEM usage and it is
intended to be installed inside an equipment.
The Telit GM862-GPS family modules is LEAD FREE Green products compliant with
RoHS directive.

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Quad Band GPS Data Terminal Module
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The design and development of the Telit GM862-GPS module is in line with the following
documents:
3GPP TS 51.010–1 GSM/EDGE Radio Access Network; Digital cellular
telecommunications system (Phase 2+): Mobile Station (MS) Conformance Specification;
Part 1. Conformance Specification.
EN 301 511 Global system for mobile communications (GSM); Harmonised standard
for mobile stations in the GSM 900 and DCS 1800 bands covering essential requirements
under Article 3(2) of the R&TTE directive (1999/5/EC).
EN 60950 Safety of information technology equipment, including business equipment.
EN 301 489–07 Electromagnetic compatibility and radio spectrum matters (ERM);
Electromagnetic compatibility (EMC) standard for radio equipment and services;
Part 7: Specific conditions for mobile and portable radio and ancillary equipment of digital
cellular radio telecommunications systems (GSM and DCS).

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Quad Band GPS Data Terminal Module
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2 MECHANICAL VIEW
2.1 Mechanical view of Telit GM862-GPS module.
GPS antenna connector

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Quad Band GPS Data Terminal Module
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3 TECHNICAL SPECIFICATIONS
Herein will be described the technical characteristics of GM862-GPS Transceiver Module.
The block diagram in Figure 1 shows the interconnection between GM862-GPS
Transceiver and Other Equipment Manufacturer Hardware.
Figure 1 GM862-GPS Transceiver.
Internal
SIM
CARD
reader
QUAD BAND
RFsection
GPS section
GPS RF connector
RX-TX connector
Charger Input
Power supply
A
/D Connect
Camera Interface
GPIO 1-7
RS232 UART data
Handset AUDIO path
Handsfree AUDIO path
BB Processing
E-Gold Lite
RS232 NMEA data

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Quad Band GPS Data Terminal Module
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3.1 GM862-GPS Transceiver Module
The GM862-GPS Transceiver Module is a Quad Band GSM - GPRS class 10 (4 down 2
up) based on Lite Infineon chipset and PV Lite internal SW platform with SiRF GSC3F
GPS chipset, on low profile compact shielded assembly with connections for GSM RX/TX
antenna, GPS antenna and data/service connector for all functional and interface signals.
The module is provided with an on board SIM Holder.
3.1.1 Electric Characteristics
3.1.1.1 Supply voltage
The external power supply must be connected to the VBATT signal and must fulfill the
following requirements:
• Nominal operating voltage: 3.8 V
• Operating voltage range: 3.4 V - 4.2 V
3.1.2 Power consumption
The typical current consumption of the GM862-GPS module is:
• Power off current (typical) < 36 μA;
• Stand–by current (power saving) < 20 mArms (< 5 mArms using command AT+CFUN)
• Operating current in voice ch. 170 mArms @ typical network conditions
• Operating current in voice ch. < 270 mArms 1.9 Apeak @ worst network conditions
• Operating current GPRS class 10 < 500 mArms @ worst network conditions
• GPS Receiver consumption < 60 mArms
• GPS Receiver (power saving) 1 mArms

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Quad Band GPS Data Terminal Module
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3.1.3 Embodied Battery charger
The battery charger is suited for 3.7V Li-Ion rechargeable battery (suggested capacity 500-
1000mAh). The Charger needs only a CURRENT LIMITED power source input and
charges the battery directly through VBATT connector pins.
• Battery charger input pin: CHARGE
• Battery pins: VBATT, GND
• Battery charger input voltage min: 5.0 V
• Battery charger input voltage typ: 5.5 V
• Battery charger input voltage max: 7.0 V
• Battery charger input current max: 400mA
• Battery type: Rechargeable Li-Ion
NOTE: If embodied battery charger is used, then a LOW ESR capacitor of at least 100μF
must be mounted in parallel to VBATT lines.
NOTE: when power is supplied to the CHARGE lines, a battery must always be connected
to the VBATT pin of the module.

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Quad Band GPS Data Terminal Module
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3.1.4 Radio Electric Characteristics
3.1.4.1 Operating frequencies
The standard operating frequencies are conforming to the ETSI GSM specifications.
Mode Freq. TX (MHz) Freq. RX (MHz) Channels (ARFC) TX - RX offset
E-GSM-900 890.0 - 914.8 935.0 - 959.8 0 – 124 45 MHz
880.2 - 889.8 925.2 - 934.8 975 - 1023 45 MHz
GSM-850 824.2 - 848.8 969.2 - 893.8 128 - 251 45 MHz
DCS-1800 1710.2 - 1784.8 1805.2 - 1879.8 512 – 885 95 MHz
PCS-1900 1850.2 - 1909.8 1930.2 - 1989.8 512 - 810 80 MHz
3.1.4.2 Transmitter output power
GSM–850
The GM862-GPS transceiver module in GSM–850 operating mode is class 4 in
accordance with the specification that set the nominal 2W peak RF power (+33dBm) on 50
Ohm.
GSM–900
The GM862-GPS transceiver module in GSM–900 operating mode is class 4 in
accordance with the specification that set the nominal 2W peak RF power (+33dBm) on 50
Ohm.
DCS–1800
The GM862-GPS transceiver module in DCS–1800 operating mode is class 1 in
accordance with the specifications that set the nominal 1W peak RF power (+30dBm) on
50 Ohm.
PCS–1900
The GM862-GPS transceiver module in PCS–1900 operating mode is class 1 in
accordance with the specifications that set the nominal 1W peak RF power (+30dBm) on
50 Ohm.
3.1.4.3 Reference sensitivity
GSM–850
The sensitivity of the GM862-GPS transceiver module according to the specifications for
the class 4 GSM–850 portable terminals is better than –102dBm in all the operational
conditions.
GSM–900
The sensitivity of the GM862-GPS Transceiver module according to the specifications, for
the class 4 GSM–900 portable terminals is better than –102dBm in all the operational
conditions. The static sensitivity is better than –105dBm in all the operational conditions.
DCS–1800
The sensitivity of the GM862- GPS Transceiver module according to the specifications, for
the class 1 portable terminals DCS 1800 is better than –102dBm in normal operating
conditions. The static sensitivity is better than –105dBm in all the operational conditions.
PCS–1900
The sensitivity of the GM862- GPS Transceiver module according to the specifications, for
the class 1 portable terminals PCS 1900 is better than –102dBm in normal operating
conditions. The static sensitivity is better than –105dBm in all the operational conditions.

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Quad Band GPS Data Terminal Module
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3.2 Environmental requirements
The GM862-GPS module is compliant with the applicable ETSI reference documentation
GSM 05.05 Release 1999 ETSI EN300910 V8.4.1.
3.2.1 Climatic requirements
The table describes a set of environmental characteristics that the platform must satisfy:
Requirement IEC Test Condition
Functional temperature 60068-2-1 Ad Cold -25 °C
Functional temperature 60068-2-2 Bd Heat +75 °C
Not functional temperature 60068-2-1 Aa Cold -40 °C
Not functional temperature 60068-2-2 Ba Heat +85 °C
Not funct. Temp. Change 60068-2-14 Nb Change of
Temperature
5 cycles -25÷+30°C
Not functional dampness 60068-2-56 Cb Damp heat
steady state
93% UR at +40°C
3.2.2 Temperature range
• Temperature in normal functional conditions: –30°C ÷+80°C
• Temperature in storage conditions: –30°C ÷+85°C
3.2.3 Vibration Test (non functional)
• 10 ÷12Hz ASD = 1.92m 2 /s 3
• 12 ÷150Hz –3dB/oct
3.2.4 SIM Card Reader
The GM862-GPS Transceiver module supports a 3 volts small type SIM card, through the
internal SIM Card Reader or through the suitable signals on the interface connector pins.

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Quad Band GPS Data Terminal Module
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3.3 Transceiver module interface connectors
3.3.1 Antenna GSM-GPS connectors
The Telit GM862-GPS Transceiver module includes two 50 Ohm MMCX coaxial female 2
pin Angle Coax SMD J01341A0081 connectors to allow the GSM RF antenna and the
GPS antenna connection.
Picture 2: GSM and GPS Antenna coax connectors
GPS antenna GSM antenna
SIM Holder connecto
r

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Quad Band GPS Data Terminal Module
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3.3.2 GSM Antenna requirements
The GSM antenna that the customer chooses to use, depending on his application, should
fulfill the following requirements:
Frequency range Standard QUAD Band frequency range,
Bandwith 80 MHz in GSM & 170 MHz in DCS & 140 MHz PCS band
Gain 1.5dBi ≤Gain <3dBi
Impedance 50 ohm
Input power > 2 W peak power
VSWR absolute max <= 10:1
VSWR recommended <= 2:1
3.3.3 GPS Antenna requirements
The GPS antenna that the customer chooses to use, depending on his application, should
fulfill the following requirements:
Frequency range GPS = 1575.42MHz
Bandwith GPS band
Gain Typical 25dB (Max 27 dB)
Impedance 50 ohm
Supply voltage Nominal 3.8V range 3.4V up to 4.2V
Power consumption 40mA max
3.3.4 SIM Card connector
The Telit GM862-GPS Transceiver module includes two models of SIM CARD connector
one “Push-Push” connector for normal applications or a Hinged Cover connector for
automotive applications.
3.4 Audio levels specifications
The audio of the Telit GM862 GPS, module is organized into two main paths:
• internal path (called also MT)
• external path (called also HF)
These two paths are meant respectively for handset and headset/handsfree use.
The Telit GM862 GPS module has a built in echo canceller and a noise suppressor, tuned
separately for the two audio paths; for the internal path the echo canceller parameters are
suited to cancel the echo generated by a handset, while for the external audio path they
are suited for a handsfree use.
For more information on the audio refer to the Hardware User Guide.
The following tables report all the audio level specifications.

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Quad Band GPS Data Terminal Module
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“Mic_MT” 1st differential microphone path
• linecoupling AC
• line type balanced
• coupling capacitor ≥100nF
• differential input resistance 50kΩ
• differential input voltage ≤1,03Vpp (365mVrms)
• microphone nominal sensitivity -45 dBVrms/Pa
• analog gain suggested + 20dB
• echo canceller type handset
“Mic_HF” 2nd differential microphone path
• linecoupling AC
• line type balanced
• coupling capacitor ≥100nF
• differential input resistance 50kΩ
• differential input voltage ≤65mVpp (23mVrms)
• microphone nominal sensitivity -45 dBVrms/Pa
• analog gain suggested +10dB
• echo canceller type car kit hands-free
Speaker characteristics
“Ear_MT” Differential Line-out Drivers Path
• line coupling: DC
• line type: bridged
• output load resistance : ≥14 Ω
• internal output resistance: 4 Ω(typical)
• signal bandwidth: 150 - 4000 Hz @ -3 dB
• max. differential output voltage 1310 mVrms (typ, open circuit)
• differential output voltage 328mVrms /16 Ω@ -12dBFS
• SW volume level step - 2 dB
• number of SW volume steps 10
“Ear_HF” Power Buffers path
• line coupling: DC
• line type: bridged
• output load resistance : ≥14 Ω
• internal output resistance: 4 Ω( >1,7 Ω)
• signal bandwidth: 150 - 4000 Hz @ -3 dB
• max. differential output voltage 1310 mVrms (typ, open circuit)
• max. single ended output voltage 656 mVrms (typ, open circuit)
• SW volume level step - 2 dB
• number of SW volume steps 10

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Quad Band GPS Data Terminal Module
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3.5 Interface connector
The GM862-GPS Transceiver module interface connector (Figure 3) is a low profile
0.50mm (.020") Pitch Receptacle - SMT, Dual Row, Vertical Stacking CSTP 50 pin Molex
52991–0508 (male) with the pin–out shown in the next table.
Pin Signal I/O Function Internal
Pull up Type
1 VBATT - Main power supply Power
2 GND - Ground Power
3 VBATT - Main power supply Power
4 GND - Ground Power
5 VBATT - Main power supply Power
6 A/D - A/D converter @ 12 bit (Input Impedance >100Kohm) Max 1V
input
7 VBATT - Main power supply Power
8 CHARGE AI Battery Charger Input (5) Power
9 EAR_HF+ AO Handsfree ear output, phase + Audio
10 EAR_MT- AO Handset earphone signal output, phase - Audio
11 EAR_HF- AO Handsfree ear output, phase - Audio
12 EAR_MT+ AO Handset earphone signal output, phase + Audio
13 MIC_HF- AI Handsfree microphone input; phase -, nominal level 3mVrms Audio
14 MIC_MT+ AI Handset microphone signal input; phase+, nominal level 50mVrms Audio
15 MIC_HF+ AI Handsfree microphone input; phase +, nominal level 3mVrms Audio
16 MIC_MT- AI Handset microphone signal input; phase-, nominal level 50mVrms Audio
17 ON_OFF I Input command for switching power ON or OFF (toggle command). The pulse to
be sent to the GM862 must be equal or greater than 1 second. 47K
Ω Pull Up to
VBATT
18 AXE I Handsfree switching 100K
Ω CMOS 2.8V
19 SIMIO I/O External SIM signal - Data I/O 3V ONLY
20 C103/TXD I Serial data input (TXD) from DTE CMOS 2.8V
21 PWRCTL O Module Status ON indication (Signal output for power on/off control of external
devices 1K
Ω CMOS 2.8V
22 SIMVCC - External SIM signal – Power (3) 3V ONLY
23 RESET I Reset input
24 SIMRST O External SIM signal – Reset 3V ONLY
25 CAM_CLK I/O Camera Interface (4) CMOS 2.8V
26 SIMCLK O External SIM signal – Clock 3V ONLY
27 SIMIN I/O External SIM signal – Presence (active low) 47K
Ω CMOS 2.8V
28 GPO2 / JDR O General purpose output (Open Collector) / Jammer Detect Report
Open
Collector
29 C106/CTS O Output for Clear to send signal (CTS) to DTE CMOS 2.8V
30 C125/RING O Output for Ring indicator signal (RI) to DTE CMOS 2.8V
31 GPI1 I General purpose input transistor
base
32 GPIO8/CAM_O
N I/O Configurable general purpose I/O pin / Camera Interface (4) CMOS 2.8V
33 C107/DSR O Output for Data set ready signal (DSR) to DTE CMOS 2.8V
34 GPIO9/CAM_RS
T I/O Configurable general purpose I/O pin / Camera Interface (4) CMOS 2.8V

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Quad Band GPS Data Terminal Module
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Pin Signal I/O Function Internal
Pull up Type
35 TX_GPS O TX Data NMEA GPS protocol CMOS 2.8V
36 C109/DCD O Output for Data carrier detect signal (DCD) to DTE CMOS 2.8V
37 C104/RXD O Serial data output to DTE CMOS 2.8V
38 GPIO10/ CLK I/O Configurable general purpose I/O pin / TRACE or Python DEBUG (5) CMOS 2.8V
39 STAT_LED O Status indicator led Open
Collector
40 GPIO11 /
IIC_HW_SDA I/O Configurable general purpose I/O pin / IIC HW CMOS 2.8V
41 RX_GPS I RX Data NMEA GPS protocol CMOS 2.8V
42 GPIO12 /
IIC_HW_SCL I/O Configurable general purpose I/O pin / IIC HW interface CMOS 2.8V
43 C108/DTR I Input for Data terminal ready signal (DTR) from DTE (4) CMOS 2.8V
44 GPIO13 / MRST I/O Configurable general purpose I/O pin / TRACE or Python DEBUG (5) CMOS 2.8V
45 C105/RTS I Input for Request to send signal (RTS) from DTE CMOS 2.8V
46 GPIO3 / CAM_
SCL I/O Configurable general purpose I/O pin /
IIC Camera Interface (4) CMOS 2.8V
47 GPIO4 /
CAM_SDA I/O Configurable general purpose I/O pin / IIC Camera Interface (4) CMOS 2.8V
48 GPIO5 / MTSR I/O Configurable general purpose I/O pin / TRACE or Python DEBUG (5) CMOS 2.8V
49
GPIO6
/ ALARM I/O Configurable general purpose I/O pin /
ALARM CMOS 2.8V
50
GPIO7
/ BUZZER
I/O Configurable general purpose I/O pin /
BUZZER CMOS 2.8V
(1) For the exclusive use of the Technical Support Service
(2) An earphone with a 150 ohm impedance can be directly connected to EAR+ and EAR–
(3) On this pin a maximum of 47nF bypass capacitor is allowed.
(4) When activating the Easy camera these pins will not be available for other use
(5) This output requires an external circuit to connect it to a serial port.
Figure 3 Interface connector mechanical view

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Quad Band GPS Data Terminal Module
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3.5.1 Logic level specification
Where not specifically stated, all the interface circuits work at 2.72V CMOS logic levels.
The following table shows the logic level specifications in the Telit GM862-QUAD/QUAD-
PY Transceiver module interface circuits:
LEVEL MIN MAX
Input high level 1.9 V 3.3 V
Input low level -0.2 V 0.5 V
Output high
level@1mA
2.15 V 2.8 V
Output low level
@1mA
0 V 0.2 V
Operating Range - Current Capability
Current Min Max
Current Output Low IOL - 1mA
Current Output High IOH - 1mA
Buffered Current Output High IBOH (2) - -
Buffered Current Output Low IBOL (2)2mA 20mA
Buffered Current Input High IBIH (1) - 0.5mA
Buffered Current Input Low IBIL (1)- 30uA
(1) For GPIO1 pin - base input.
(2) For GPIO2 pin - Open Collector.
3.5.2 Reset signal
RESET is used to reset the Telit GM862-GPS Transceiver module. Whenever this signal is
pulled low, the GM862-GPS is reset and Re-booted.
CONNECTOR PIN I/O SIGNAL FUNCTION
SO301 23 I RESET Module reset and
Reboot
NOTE: do not use this signal to power off the Telit GM862-GPS module.
Use the ON/OFF signal (Pin 17 of SO301) to perform this function.
Signal levels:
SIGNAL MIN MAX
RESET Input high 2.2 V 3.3 V
RESET Input low 0 V 0.2 V
If unused, this signal may be left unconnected.

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Quad Band GPS Data Terminal Module
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3.6 Mechanical characteristics
3.6.1 Dimensions
The Telit GM862-PCS module overall dimension are:
Length: 43.9 mm
Width: 43.9 mm
Thickness: 6.9 mm
Volume: ≅13 cm3
The mechanical layout of Telit GM862-GPS Transceiver module is shown in Figure 4
6.25
Figure 4 GM862-GPS Transceiver Mechanical layout
3.6.2 Weight
The Telit GM862-GPS module weight is 25gr, (shielding included).

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Quad Band GPS Data Terminal Module
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3.7 GM862-GPS Data Terminal System
3.7.1 User Interface
The following features of GM862-GPS Data Terminal System user interface are managed
by AT commands specified on the GSM 07.07 and 07.05 specifications and listed in the
following.
3.7.2 Speech Coding
The vocoder of Telit GM862-GPS Data Terminal System supports the following rates:
• Half Rate.
• Full rate,
• Enhanced Full Rate;
3.7.3 SMS
The Telit GM862-GPS Data Terminal System supports the following SMS types:
• *Mobile Terminated (MT) class 0 – 2 with signaling of new incoming SMS, SIM full,
SMS read
• Mobile Originated class 0 – 3 with writing, memorize in SIM and sending
• *Cell Broadcast compatible with CB DRX with signaling of new incoming SMS.
3.7.4 Real Time Clock and Alarm
The Telit GM862-GPS module supports the Real Time Clock and Alarm functions through
AT commands; furthermore an alarm output pin (GPIO6) can be configured to indicate the
alarm with a hardware line output.
3.7.5 Data/fax transmission
The Telit GM862-GPS Data Terminal System supports:
• Packed Data transfer GPRS Class B, Multislot Class 10.
• Data transmission according to the GSM 07.07, 07.05
• CSD up to 14.4 Kbps
• Fax service, Class 1 Group 3
3.7.6 Local security management
With lock of Subscriber Identity module (SIM), and security code request at power–up.
3.7.7 Call control
Call cost control.
3.7.8 Phonebook
Function available to store the telephone number in SIM memory.
Capability depends on SIM version/memory.
3.7.9 Characters management
Availability of lowercase, uppercase and IRA characters. (international reference alphabet)
In SMS PDU mode all character set are supported.
3.7.10 SIM related functions
Activation/deactivation of the numbers stored in phone book FDN, ADN and PINs.
Extension at the PIN2 for the PUK2 insertion capability for lock condition.
3.7.11 Call status indication
By AT commands.
3.7.12 Indication of network service availability
By AT commands and LED indication on dedicated output.

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The STAT_LED is an Open Collector output where it is possible to directly connect a LED
to show information on the network service availability and Call status.
STAT_LED indications
LED status Device Status
permanently off device off
fast blinking
(period 1s, Ton 0,5s)
Net search / Not registered /
turning off
slow blinking
(period 3s, Ton 0,3s)
Registered full service
permanently on a call is active
3.7.13 Automatic answer (Voice, Data or FAX)
After n (depends of settings) rings automatically answers with beep (see S0 parameter).
3.7.14 Supplementary services (SS)
• Call Barring,
• Call Forwarding,
• Calling Line Identification Presentation (CLIP),
• Calling Line Identification Restriction (CLIR),
• Call Waiting, other party call Waiting Indication,
• Call Hold, other party Hold / Retrieved Indication,
• Closed User Group supplementary service (CUG),
• Advice of Charge,
• Unstructured SS Mobile Originated (MO)
3.7.15 Acoustic signalling
The acoustic signaling on the selected acoustic device are the following:
• Call waiting;
• Ringing tone;
• SMS received tone;
• Busy tone;
• Power on/off tone;
• Off Hook dial tone;
• Congestion tone;
• Connected tone;
• Call dropped;
• No service tone;
• Alarm Tone.