Sony Ericsson GM47 Parts list manual

GM 47/GM 48
Technical Description

CE
The product described in this manual conforms to the Radio Equipment and Telecommunication Terminal
Equipment (R&TTE) directive 99/5/EC with requirements covering EMC directive 89/336/EEC and
Low Voltage directive 73/23/EEC. The product fulfils the requirements according to 3GPP TS 51.010-1,
EN 301489-7 and EN60950.
The information contained in this document is the proprietary information of Sony Ericsson Mobile
Communications. The contents are confidential and any disclosure to persons other than the officers,
employees, agents or subcontractors of the owner or licensee of this document, without the prior written
consent of Sony Ericsson Mobile Communications, is strictly prohibited.
Further, no portion of this publication may be reproduced, stored in a retrieval system, or transmitted in
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prior written consent of Sony Ericsson Mobile Communications, the copyright holder.
Third edition (June 2002)
Sony Ericsson Mobile Communications. publishes this manual without making any warranty as to the
content contained herein. Further Sony Ericsson Mobile Communications. reserves the right to make
modifications, additions and deletions to this manual due to typographical errors, inaccurate information,
or improvements to programs and/or equipment at any time and without notice. Such changes will,
nevertheless be incorporated into new editions of this manual.
All rights reserved.
©Sony Ericsson Mobile Communications., 2002
Publication number:
Printed in UK

GM47/GM48 Technical description
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Contents
1 INTRODUCTION....................................................................................................................5
1.1 OVERVIEW ........................................................................................................................5
1.2 FEATURES.........................................................................................................................6
1.2.1 Type of Mobile Station .............................................................................................6
1.2.2 SMS .........................................................................................................................7
1.2.3 Voice calls................................................................................................................7
1.2.4 Data..........................................................................................................................7
1.2.5 SIM Card..................................................................................................................8
1.2.6 Power consumption..................................................................................................8
1.2.7 Other features..........................................................................................................8
1.2.8 Development Kit.......................................................................................................8
1.3 PRECAUTIONS...................................................................................................................8
1.4 ABBREVIATIONS.................................................................................................................9
2 MECHANICAL DESCRIPTION............................................................................................10
2.1 INTERFACE DESCRIPTION.................................................................................................10
2.2 PHYSICAL DIMENSIONS....................................................................................................11
3 SYSTEM CONNECTOR INTERFACE.................................................................................12
3.1 OVERVIEW ......................................................................................................................12
3.2 GENERAL ELECTRICAL AND LOGICAL CHARACTERISTICS....................................................15
3.2.1 General Protection Requirements..........................................................................15
3.3 GROUNDS .......................................................................................................................16
3.3.1 The Analogue Ground............................................................................................16
3.3.2 The Digital Ground (DGND)...................................................................................16
3.4 REGULATED POWER SUPPLY ...........................................................................................17
3.4.1 Power Supply (VCC)..............................................................................................17
3.5 ON/OFF AND EXTERNAL POWER SIGNALS.......................................................................17
3.5.1 Module ON/OFF.....................................................................................................17
3.5.2 External 2.75 V (VIO).............................................................................................18
3.6 ANALOGUE AUDIO ...........................................................................................................19
3.6.1 Audio To Mobile Station (ATMS) ...........................................................................19
3.6.2 Audio From Mobile Station (AFMS).......................................................................21
3.7 MICROPHONE SIGNALS....................................................................................................21
3.8 SPEAKER SIGNALS ..........................................................................................................22
3.9 DIGITAL AUDIO ................................................................................................................22
3.10 SERIAL DATA...................................................................................................................24
3.10.1 UART 1 (RS232) - RD, TD, RTS, CTS, DTR, DCD and RI...................................25
3.10.2 Serial Data Signals - RD, TD .................................................................................25
3.10.3 Control Signals - RTS, CTS, DTR, DCD, RI..........................................................26
3.10.4 UART 2 - TD2, RD2...............................................................................................28
3.10.5 UART 3 - TD3, RD3...............................................................................................28
3.11 SIM CARD RELATED SIGNALS...........................................................................................29
3.11.1 SIM Detection – SIM Presence..............................................................................30
3.12 SERVICE/PROGRAMMING .................................................................................................30
3.13 BUZZER ..........................................................................................................................31
3.14 LED................................................................................................................................31
3.15 TX_ON - BURST TRANSMISSION......................................................................................32
3.16 TIMESTAMP .....................................................................................................................32
3.17 REAL TIME CLOCK...........................................................................................................33
4 ANTENNA CONNECTOR....................................................................................................34

GM47/GM48 Technical description
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5 AT COMMAND SUMMARY.................................................................................................35
6 TECHNICAL DATA..............................................................................................................38
7 CONTACT DETAILS............................................................................................................40

GM47/GM48 Technical description
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1 Introduction
1.1 Overview The GM47/GM48 belong to a new generation of Sony Ericsson
Mobile Communications GSM modules. This document describes the
main characteristics and functionality of the GM 47/48, two dual band
products for 900/1800 MHz and 850/1900 MHz GSM bands
respectively.
They are intended to be used in both machine-to-machine applications
and man-to-machine applications. The module serves its purpose
when there is a need for sending and receiving data (by SMS, CSD,
HSCSD, or GPRS), as well as making voice calls over the GSM
network.
GM47/GM48 are business-to-business products. It is intended to be
sold to manufacturers, system integrators, applications developers-
developing solutions with wireless communication. The module is
intended to be integrated by the system integrator within an
application. The module and the external application will form a
system for wireless communication.
A typical system is one where a micro controller in an external
application communicates with the module over its serial interface.
The micro controller will control the module, via the supported set of
AT commands. It is assumed that the system integrators have a high
technical knowledge and the ability to integrate the module into a
system. For the GM47/GM48 modules some interesting applications
are the following:
•Fleet and Asset Management
•Vending Machines
•Security and Alarm
•Other telemetry applications

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1.2 Features The module performs a set of telecom services (TS) according to
GSM standard phase 2+, ETSI and ITU-T. The functions of the
module are implemented by issuing AT commands over the serial
interface. Supported AT commands are listed in section 5, these are
defined further in GSM 7.05/7.07 and the GM47/GM48 integrators
manual.
1.2.1 Type of Mobile Station
The GM 4X family are normal dual band type of MS with the
following characteristics.
GM 47 GSM 900 E-GSM 900 GSM 1800
Frequency Range
(MHz) TX: 890-915
RX: 935-960
TX: 880-890
RX: 925-935
TX: 1710-1785
RX: 1805-1880
Channel spacing 200 kHz 200 kHz
Number of channels 173 Carriers *8 (TDMA)
GSM: Channels 1 to 124
E-GSM: Channels 975 to 1023
374 Carriers *8 (TDMA)
DCS: Channels 512 to 885
Modulation GMSK GMSK
TX Phase Accuracy < 5º RMS Phase error (burst) < 5º RMS Phase error (burst)
Duplex spacing 45 MHz 95 MHz
Receiver sensitivity at
antenna connector < - 102 dBm < - 102 dBm
Transmitter output
power at antenna
connector
Class 4
2W (33 dBm)
Class 1
1W (30 dBm)
Automatic hand-over between GSM 900 and GSM 1800
GM 48 GSM 850 GSM 1900
Frequency Range (MHz) TX: 824-849
RX: 869-894
TX: 1850-1910
RX: 1930-1990
Channel spacing 200 kHz 200 kHz
Number of channels 123 carriers *8 (TDMA)
GSM: Channels 128 to 251
298 Carriers *8 (TDMA)
PCS: Channels 512 to 810
Modulation GMSK GMSK
TX Phase Accuracy < 5º RMS Phase error (burst) < 5º RMS Phase error (burst)
Duplex spacing 45 MHz 80 MHz
Receiver sensitivity at antenna
connector < - 102 dBm < - 102 dBm
Transmitter output power at
antenna connector Class 5
0.8 W (29 dBm)
Class 1
1W (30 dBm)
Automatic hand-over between GSM 850 and GSM 1900

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1.2.2 SMS The module supports the following SMS services:
•Sending: MO, both PDU and Text mode supported.
•Receiving: MT, both PDU and Text mode supported.
•CBM is a service, in which a message is sent to all subscribers
located in one or more specific cell(s) in the GSM network, for
example, cell location information.
•SMS STATUS REPORT according to GSM 03.40.
The maximum length of an SMS message is 160 characters when
using 7-bit encoding. For 8-bit data, the maximum length is 140
characters.
The module supports upto 6 concatenated messages to extend this
function.
1.2.3 Voice calls The GM47/GM48 offers the capability of MO and MT voice calls, as
well as supporting emergency calls. In addition to this multiparty, call
waiting and call deflection features are available. Some of these
features are operator specific.
The module offers normal analogue input/output lines, analogue audio
input/ output lines in differential modes, and digital audio interface,
with the possibility of accessing internal points within the digital
audio lines. Moreover, the GM47/GM48 have embedded echo
canceller and noise suppresser, which provide high quality audio.
The module supports HR, FR and EFR voice coding, provided that
EFR is available in the network.
1.2.4 Data The module supports the following data protocols:
•General Packet Radio Service (GPRS). The modules are Class B
Terminals, which provides simultaneous activation and attach of
GPRS and GSM services. The GM47/GM48 modules are GPRS
4+1 devices, which are capable of transmitting in one timeslot per
frame (uplink), and receiving in a maximum of four timeslots per
frame (downlink).
•Circuit Switched Data (CSD). GM47/GM48 modules are capable
of establishing a circuit switch data link at 9.6 kbps.
•High Speed Circuit Switched Data (HSCSD).
GM47/GM48supports HSCSD communication, with one timeslot
per frame capacity in the uplink and two timeslots per frame
capacity in the downlink (2+1).

GM47/GM48 Technical description
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1.2.5 SIM Card
The module supports the connection of an external SIM Card with 3V
or 5 V technology, via the 60-pin system connector. The module does
not have an internal SIM holder.
1.2.6 Power consumption
Stand-by Transmit/Operation
GSM 850 & 900 MHz <5 mA 275 mA (2A peak)
GSM 1800 & 1900 MHz <5 mA 250 mA (1.75A peak)
Note! The power consumption during transmission is measured at
maximum transmit power.
1.2.7 Other features
•07.10 Multiplexing
•GPS interoperability
•SIM application toolkit, class 2 release 96 compliant
1.2.8 Development Kit
Sony Ericsson Mobile Communications provides the opportunity to
test the module in a limited scale, before ordering a large quantity.
With the development kit you can quickly get started with the module.
The kit includes necessary accessories (software and hardware) that
you will need for your test purposes. It also includes the following:
•GSM module GM 47 or GM 48
•Integrator’s Manual
The Integrator’s Manual provides you with all the information you
need to be able to integrate the module with your application.
This is available from your regional salesperson or M2M customer
support (see section 7)
1.3 Precautions The GM47/GM48should be handled like any mobile station. In the
Integrators’ Manual you will find more information about safety and
product care. In the Technical Data chapter in this document the

GM47/GM48 Technical description
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environmental and electrical limits are specified. Never exceed these
limits to ensure the module is not damaged.
1.4 Abbreviations
Abbreviation Explanation
ATMS Audio To Mobile Staition
AFMS Audio From Mobile Station
CBS Cell Broadcast Service
CBM Cell Broadcast Messaging
CSD Circuit Switch Data
DCE Data Circuit Terminating Equipment
DTE Data Terminal Equipment
DTMF Dual Tone Multi Frequency
EFR Enhanced Full Rate codec
EMC Electro-Magnetic Compatibility
ETSI European Telecommunications Standards Institute
FR Full Rate codec
GPRS General Packet Radio Service
GPS Global Positioning System
GSM Global System for Mobile Comunication
HR Half Rate codec
HSCSD High Speed Circuit Switched Data
ITU-T International Telecommunication Union – Telecommunications
Standardisation Sector
ME Mobile Equipment
MMCX Micro Minature Coax
MO Mobile Originated
MS Mobile Station
MT Mobile Terminated
PCM Pulse Code Modulation
PDU Protocol Data Unit
RLP Radio Link Protocol
RF Radio Frequency
RFU Reserved for Future Use
RTC Real Time Clock
SDP Service Discovery Protocol
SMS Short Message Service
SIM Subscriber Identity Module
TBD To Be Defined

GM47/GM48 Technical description
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2 Mechanical Description
2.1 Interface Description
The picture below presents the conceptual mechanical design of the
GM 47/48. The GM 47/48 are protected with AISI 304 Stainless Steel
covers suitable to fulfil the environmental and EMC requirements.
Dimensions, the position of the different connectors and mounting
holes are shown in figure 2.2.
Figure 2.1 GM 47/48, view from the underside

GM47/GM48 Technical description
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2.2 Physical Dimensions
Figure 2.2 Physical dimensions of GM 47/48
The measures are given in millimetre’s. See also chapter 6, Technical
Data.

GM47/GM48 Technical description
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3 System Connector Interface
3.1 Overview
The electrical connections to the module (except the antenna), are
made through the System Connector Interface.
The connector shall allow the following connections: board to board
and board to cable. Details of connector availability and sources are
available from customer support on request.
Figure 3.1 GM 47/48. View from the underside
The table on next page provides the pin assignment of the different
signals in the System Connector Interface as well as a short
description of them.
All signal directions are with respect to the module i.e. Direction 'O'
means data being sent by the module.

GM47/GM48 Technical description
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Pin Signal Name Dir Signal Type Description
1. VCC ISupply Power Supply
2. DGND - - Digital Ground
3. VCC ISupply Power Supply
4. DGND - - Digital Ground
5. VCC ISupply Power Supply
6. DGND - - Digital Ground
7. VCC ISupply Power Supply
8. DGND - - Digital Ground
9. VCC ISupply Power Supply
10. DGND - - Digital Ground
11. VCC ISupply Power Supply
12. DGND - - Digital Ground
13. Reserved for future use
14. ON/OFF I Internal pull up,
open drain Turns the module on/off
Former WAKE_B
15. SIMVCC -Dig. 3/5 V SIM card power supply
Power output for SIM Card from module
16. SIMPRESENCE I Internal pull up,
open drain SIM Presence
A "1" shall indicate that the SIM is missing;
a "0" that it is inserted.
17. SIMRST ODig. 3/5 V SIM card reset
18. SIMDATA I/O Dig. 3/5 V SIM card data
19. SIMCLK ODig. 3/5 V SIM card clock
20. DAC O Analogue Digital to Analogue converter
21. IO1 I/O Digital, 2.75 General purpose input/output 1
22. IO2 I/O Digital, 2.75 General purpose input/output 2
23. IO3 I/O Digital, 2.75 General purpose input/output 3
24. IO4 I/O Digital, 2.75 General purpose input/output 4
25. VRTC ISupply 1.8 V Voltage for real time clock
26. ADC1 I Analogue Analogue to Digital converter 1
27. ADC2 IAnalogue Analogue to Digital converter 2
28. ADC3 I Analogue Analogue to Digital converter 3
29. SDA I/O 2.75, internal
pullup I2C Data
30. SCL O 2.75, internal
pullup I2C Clock
31. BUZZER ODig. 2.75 Buzzer output from module
32. TIMESTAMP O Dig. 2.75 Timestamp
Timestamp is reserved for future use,
when A-GPS is implemented in the

GM47/GM48 Technical description
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networks side.
33. LED ODig. 2.75 Flashing LED
34. VIO O Power Out 2.75 Module powered indication.
The VIO is a 2.75 V output that could
power external devices to transmit data
towards the GSM device to a 75mA max.
35. TX_ON ODig 2.75 This output shall indicate when the GSM
module is going to transmit the burst.
36. RI O Dig. 2.75 Ring Indicator
37. DTR IDig. 2.75 Data Terminal Ready
38. DCD O Dig. 2.75 Data Carrier Detect
39. RTS IDig. 2.75 Request To Send
40. CTS O Dig. 2.75 Clear To Send
41. TD IDig. 2.75 Transmitted Data
Data from DTE (host) to DCE (module).
[former DTMS]
42. RD O Dig. 2.75 Received Data
Data from DCE (module) to DTE (host).
[former DFMS]
43. TD3 IDig. 2.75 UART3 Transmission
Data from DTE (host) to DCE (module).
[former DTMS]
44. RD3 O Dig. 2.75 UART3 Reception
Data from DCE (module) to DTE (host).
[former DFMS]
45. TD2 IDig. 2.75 UART2 Reception
Data from DTE (host) to DCE (module).
Former CTMS. Used for flashing
46. RD2 O Dig. 2.75 UART2 Transmission
Data from DCE (module) to DTE (host).
Former CFMS. Used for flashing
47. PCMULD IDig. 2.75 DSP PCM digital audio input
48. PCMDLD O Dig. 2.75 DSP PCM digital audio output
49. PCMO ODig. 2.75 Codec PCM digital audio output
50. PCMI I Dig. 2.75 Codec PCM digital audio input
51. PCMSYNC ODig. 2.75 DSP PCM frame sync
52. PCMCLK O Dig. 2.75 DSP PCM clock output
53. MICP IAnalogue Microphone input positive
54. MICN I Analogue Microphone input negative
55. BEARP OAnalogue Speaker output positive
56. BEARN O Analogue Speaker output negative
57. AFMS OAnalogue Audio output from module
58. SERVICE I 12V/2.7V Flash programming voltage for the MS.

GM47/GM48 Technical description
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Enable logger information if no flashing
Former VPPFLASH
59. ATMS IAnalogue Audio input to module
60. AGND - Analogue Analogue ground
3.2 General Electrical and Logical Characteristics
Many of the signals present in the interface are high-speed CMOS
logic inputs or outputs powered from 2.75 V ± 5 %. Whenever a
signal is defined as Dig. 2.75 V, the following electrical
characteristics shall apply.
Parameter Min. Typ. Max. Units Output
Current Io
High Level Output Voltage (VOH)2.2 2.75 Volts - 2 mA
Low Level Output Voltage (VOL) 0 0.6 Volts 2 mA
High Level Input Voltage (VIH)1.93 2.75 Volts
Low Level Input voltage (VIL) 0 0.5 Volts
3.2.1 General Protection Requirements
All 2.75V digital inputs shall continuously withstand any voltage from
-0.5V up to 3.47V (3.3V + 5%) in the power-on or power-off
condition with no damage. All 2.75V digital outputs shall
continuously withstand a short circuit to any voltage within the range
from 0V to 3V.
! Note : This is for protection ONLY, the module cannot be driven
directly by a 3.3V micro processor, if this is done it will invalidate any
warranty claim on the module.
The SIM output signals and the SIMVCC supply can continuously
withstand a short circuit to any voltage within the range from 0V to
4.1V.

GM47/GM48 Technical description
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3.3 Grounds
Pins Name Description
2, 4, 6, 8, 10, 12 DGND Digital Ground
60 AGND Analogue Ground
There are two ground signals in GM 47/48, Analogue Ground
(AGND) and Digital Ground (DGND). The analogue Ground is
connected to pin number 60, and the Digital Ground is connected to
the System Connector Interface through pin numbers 2, 4, 6, 8, 10 and
12.
Note: All the Ground pins have to be connected to the application.
The AGND is connected to the DGND in the ME, and only there. It is
important that the AGND and the DGND are separated in the
application.
3.3.1 The Analogue Ground
The AGND lead is the analogue audio reference ground. It is the
return signal for Audio To Mobile Station (ATMS) and Audio From
Mobile Station (AFMS).
It shall be connected to the Digital Ground (DGND) inside the module
and only there. The application shall not connect DGND and AGND.
Parameter Limit
Imax ≅12.5mA
3.3.2 The Digital Ground (DGND)
DGND is the reference for all digital signals in the System Interface.
It shall also be the DC return for the power supply on VCC and
SERVICE. Each DGND pin is rated at 0.5 A. All DGND pins are
connected internally in the module.
All DGND pins should be connected commonly in the application.
Parameter Limit
Iaverage < 0.5 A No DGND pin can withstand over 0.5 A
Imax < 600 mA (100 mA each)

GM47/GM48 Technical description
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3.4 Regulated Power Supply
Pins Name Description
1, 3, 5, 7, 9, 11 VCC Regulated Power Supply
The regulated power supply, VCC, is connected to the pin numbers 1,
3, 5, 7, 9 and 11.
3.4.1 Power Supply (VCC)
The VCC supplies the module with external power. Any other voltage
needed is generated internally.
Parameter Mode Limit
Voltage to be applied Nominal 3.6 Volts
Tolerance including ripple1 3.4 Volts - 4.0 Volts
Over voltages 5.5 Volts
Current Drive capability at TX Full Power < 600 mA (average))
< 2 A (Peak)
GM 47/48 have not internal capacitance to supply the large current
peaks during GSM transmission. Therefore on burst transmission the
application DC source is responsible for providing the appropriate
current.
Design application notes are available from customer support on
request.
3.5 ON/OFF and External Power Signals
Pins Name Dir Description
14 ON/OFF ISquare signal to turn on/off the module
34 VIO O External power supply
3.5.1 Module ON/OFF
The module is powered ON/OFF by grounding (pulling low) pin 14 as
per figure 3.2 below. The pin should then be released as it has an
internal pull up to return it to the high state.
Note: Driving with 2.75V or 3.6V is not permitted and restricts
module functionality.
1 Measured at system connector pins.

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Parameter Minimum Typical Maximum Units
Voltage HIGH Level (FALSE) VCC By internal
pull up only
Voltage LOW Level (TRUE) 0 0.3*VCC Volts
Pull-up Resistance Internal pull up 39 KΩ
Figure 3.2ON/OFF and VIO performance
Where the times are defined as follows:
Time Description Min Typ Max Unit
tmr Time to start an ON/OFF operation 11.5 S
tpwr Time for module start-up once ON/ OFF
signal has set to TRUE 100 200 MS
3.5.2 External 2.75 V (VIO)
The VIO has been derived from a 2.75 V regulator. It is possible to
use this output as a power supply at 2.75 V with a maximum of 75mA.
It will indicate that the module is alive and it could power external
devices. In this case, the external applications do not need to
implement a 2.75 volt regulator to adapt the incoming (from module
point of view) serial data.
Parameter Minimum Typical Maximum Units
Output Voltage (Iload=50 mA) 2.70 2.75 2.85 Volts
Load current 75 mA

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3.6 Analogue Audio
Pins Name Dir Description
57 AFMS OAudio From Mobile Station
59 ATMS I Audio To Mobile Station
60 AGND -Reference for analogue audio
ATMS and AFMS are the audio input and output for the module. The
analogue audio signals can be used in two different modes, Handsfree
and Portable Handsfree.
Handsfree
This mode is referred to as Audio To Mobile Station (ATMS) and
Audio From Mobile Station (AFMS). It is used by audio accessories
such as Handsets and Handsfree equipment.
Portable Handsfree
This mode activates a different amplification factor in the Mobile
Equipment (ME). It also activates a microphone bias level in ATMS.
This is the default mode.
3.6.1 Audio To Mobile Station (ATMS)
ATMS is the analogue audio input to the module. It connects to the
audio input of the CODEC in the module. The CODEC then converts
the analogue audio to digital audio, in PCM format, which is
connected to the internal PCM bus in the module. The internal PCM
bus connects the encoded audio to PCMO on the system connector.
ATMS is also used as the microphone input from the Portable
Handsfree. If this is the case, a DC bias is provided from the ATMS.
All sources must be AC-coupled except the Portable Handsfree
microphone, which shall be DC-coupled in order to supply DC current
to the Portable Handsfree microphone. AC coupling prevents incorrect
biasing or damage of the ATMS input. The capacitor must have a
value greater than shown below to avoid attenuation of low
frequencies.
The ATMS input is a passive network followed by the transmit part of
the CODEC.

GM47/GM48 Technical description
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Parameter Limit
Application driving impedance (0.3 - 3.5 kHz) <300 Ω
AC coupling capacitance 2>1 µF
Module input impedance (0.3 - 3.5 kHz) >50ΚΩ
Low frequency cut-off (- 3 dB) 300 Hz ± 50 Hz
High frequency cut-off (- 3 dB) > 3500 Hz
Maximum allowed input level 1.5Vpp = 530mV
Output DC bias level Handsfree mode 0 V
Portable Handsfree mode 2 V ± 0.1 V
Additional Gain in Portable Handsfree mode 28.5 dB
•Maximum input level at ATMS 245mVrms output at PCMO =
3dBm0.
•The following table is with nominal PGA (Programmable Gain
Settings).
•For more information see AT commands in the integrators manual.
Input Input Volts mVrms TXAGC dB AUXI1 Gain PCMO dBm0
ATMS 245 013 3
Maximum input level at MICI 61.4mVrms output at PCMO = 3dBm0
Input Input Volts mVrms TXAGC dB AUXI1 Gain PCMO dBm0
MICI 61.4 025 3
Output at AUX02 for 3dBm0 at PCMI
Input dBm0 RXPGA Volume
Control dB AUX02 mVrms
PCMI 3dBm0 0 0 436
Output at BEAR for 3dBm0 at PCMI
Input dBm0 RXPGA Volume
Control dB BEAR mVrms
PCMI 3dBm0 0 0 388
2AC coupling capacitance must be supplied by the application, unless a DC coupled microphone
is used.