Multitech SocketModem EDGE Developer's Manual

SocketModem EDGE

Embedded Wireless Modem

Preliminary Copy

Not for Release

Developer’s Guide

Copyright and Technical Support

SocketModem EDGE Developer’s Guide
MTSMC-E
PN S000376A, Version A

Copyright

This publication may not be reproduced, in whole or in part, without prior expressed written permission from Multi­Tech Systems, Inc. All rights reserved.
Copyright © 2005, by Multi-Tech Systems, Inc.
Multi-Tech Systems, Inc. makes no representations or warranties with respect to the contents hereof and specifically
disclaims any implied warranties of merchantability or fitness for any particular purpose. Furthermore, Multi-Tech
Systems, Inc. reserves the right to revise this publication and to make changes from time to time in the content hereof
without obligation of Multi-Tech Systems, Inc. to notify any person or organization of such revisions or changes.

Revisions

Revision Level Date Description

A 06/28/05 Initial release.

Trademarks

Multi-Tech Trademarks: SocketModem, Multi-Tech, and the Multi-Tech logo.
All other products and technologies are the trademarks or registered trademarks of their respective holders.

World Headquarters

Multi-Tech Systems, Inc.
2205 Woodale Drive
Mounds View, Minnesota 55112
Phone: [phone] or 800-328-9717
Fax: [phone]

Technical Support
Country By Email By Phone

France: [e-mail] (33) 1-64 61 09 81
India: [e-mail] 91 (124) 6340778
U.K.: [e-mail] (44) 118 959 7774
U.S. and Canada: [e-mail] [phone]
Rest of the World: [e-mail] [phone]
Internet Address: http://www.multitech.com

Multi-Tech Systems, Inc. SocketModem EDGE Embedded Wireless Modem Developer’s Guide (S000376A) 2

Table of Contents

Table of Contents

CHAPTER 1 – PRODUCT DESCRIPTION AND SPECIFICATIONS............................................................................ 4

PRODUCT DESCRIPTION................................................................................................................................................. 4

PRODUCT FEATURES .....................................................................................................................................................4

AT COMMANDS .............................................................................................................................................................4

FEATURE DETAILS ......................................................................................................................................................... 5

DEVELOPER’S KIT..........................................................................................................................................................5

TECHNICAL SPECIFICATIONS........................................................................................................................................... 5

SAFETY ........................................................................................................................................................................6

Instructions to OEMs...............................................................................................................................................6

Radio Frequency (RF) Safety .................................................................................................................................6

Electronic Devices ..................................................................................................................................................6

Vehicle Electronic Equipment .................................................................................................................................6

Medical Electronic Equipment................................................................................................................................. 6

Aircraft ....................................................................................................................................................................7

Handling Precautions..............................................................................................................................................7

Electromagnetic Interference (EMI) Considerations................................................................................................ 7

Driving.....................................................................................................................................................................7

Children ..................................................................................................................................................................7

Blasting Areas......................................................................................................................................................... 7

Potentially Explosive Atmospheres ......................................................................................................................... 8

MULTI-TECH’S COMPLIANCE WITH SAFETY STANDARDS .................................................................................................... 8

Radio Frequency Exposures...................................................................................................................................8

CHAPTER 2 – MECHANICAL SPECIFICATIONS........................................................................................................ 9

PHYSICAL DIMENSIONS ..................................................................................................................................................9

PIN CONFIGURATIONS..................................................................................................................................................10

EDGE Pin Descriptions.........................................................................................................................................10

Pin 58 – LED Mode...............................................................................................................................................11

LEDS AND SOCKETMODEM STATUS.............................................................................................................................. 11

CHAPTER 3 – ELECTRICAL CHARACTERISTICS ................................................................................................... 12

I/O ELECTRICAL CHARACTERISTICS...............................................................................................................................12

VOICE MODE POWER CONSUMPTION ............................................................................................................................ 12

DATA MODE POWER CONSUMPTION.............................................................................................................................. 12

SIM INTERFACE ELECTRICAL CHARACTERISTICS ............................................................................................................13

CHAPTER 4 – SIM CONNECTOR AND ANTENNA CONNECTOR ...........................................................................14

SIM CONNECTOR........................................................................................................................................................ 14

ANTENNA....................................................................................................................................................................14

Receiver Features.................................................................................................................................................14

Transmitter Features............................................................................................................................................. 14

CHAPTER 5 – SOCKETMODEM SCHEMATICS........................................................................................................16

SOCKETMODEM EDGE DIAGRAMS................................................................................................................................. 16

SOCKETMODEM EDGE BLOCK DIAGRAM ......................................................................................................................17

SOCKETMODEM EDGE SCHEMATICS............................................................................................................................ 18

CHAPTER 6 – HARDWARE GUIDELINES................................................................................................................. 20

GENERAL GUIDELINES FOR THE USE OF THE SOCKETMODEM ..........................................................................................20

Hardware and RF.................................................................................................................................................. 20

The Antenna .........................................................................................................................................................20

Soldering and Cleaning the SocketModem...........................................................................................................20

APPENDIX A – WARRANTY AND REPAIRS.............................................................................................................21

Multi-Tech Warranty Statement ............................................................................................................................21

Repair Procedures for U.S. and Canadian Customers .........................................................................................21

Repair Procedures for International Customers (Outside U.S.A. and Canada).....................................................22

Repair Procedures for International Distributors ...................................................................................................22

INDEX .......................................................................................................................................................................... 23

Multi-Tech Systems, Inc. SocketModem EDGE Embedded Wireless Modem Developer’s Guide (S000376A) 3

Chapter 1 – Product Description and Specifications

Chapter 1 – Product Description and

Specifications

Product Description

The Multi-Tech SocketModem EDGE embedded wireless modem delivers some of the fastest cellular data speeds by
utilizing EDGE technology. It allows users to connect to the Internet and send and receive data up to three times
faster than possible with an ordinary GSM/GPRS network making it ideal for highly data-intensive applications. Based
on industry-standard open interfaces, the SocketModem EDGE wireless modem is equipped with quad-band GSM,
which means it can be used worldwide on all exitsting GSM networks. In addition, it utilizes Multi-Tech's universal
socket design.

Multi-Tech’s SocketModem EDGE Embedded Wireless Modem Builds

Product Trade Name Description Region

MTSMC-E
MTSMC-E-V

SocketModem
SocketModem

Product Features

• EDGE (E-GPRS) Class 10

• GPRS Class 12

• Quad-band GSM 850/900/1800/1900 MHz

• Packet data rates up to 240K bps (coding scheme, MCS-9, LLC layer, 4 time slots)

• Embedded TCP/IP stack supports TCP, UDP, DNS, FTP, SMTP, POP3, HTTP

• Circuit-switched data up to 9600 bps transparent and non-transparent

• Supports Short Message Service features including text and PDU mode, point to point (MT/MO), and

cell broadcast

• SMA antenna connector

• Serial interface supporting DTE speeds to 460K bps

• AT command compatible*

• Carrier approved

• Voice features include Half Rate (HR), Full Rate (FR), Enhanced Full Rate (EFR), Adaptive Multi Rate

(AMR), as well as hands free echo cancellation, and noise reduction

• Two-year warranty

AT Commands

AT commands for this product are published in a separate document available on the Developer’s Kit system CD or
from Multi-Tech. For a copy of this document, contact OEM Sales at [e-mail]
[phone].



EDGE



EDGE

Quad-band EDGE Class 10 Global
Quad-band EDGE Class 10 w/Voice Global

or call:

Multi-Tech Systems, Inc. SocketModem EDGE Embedded Wireless Modem Developer’s Guide (S000376A) 4

Chapter 1 – Product Description and Specifications

Feature Details

Applications. With packet data speeds up to three times faster than ordinary CPRS modems, the SocketModem

EDGE wireless modem is targeted at highly data-intensive applications such as remote video surveillance and
other multimedia applications that send digital images, Web pages, and photographs.

Integration Reduces Space, Power, and Cost. The SocketModem

controller, RF transceiver, and antenna interface in one module. This integration requires low power and low real
estate, and provides an overall reduction in costs.

Reduces Development Time. The SocketModem EDGE wireless modem enhances your product while you

focus on developing its core features. It actually provides faster time-to-market because it relieves the burden
and expense of obtaining PTCRB and RF approvals.

Internet-Enabled. The SocketModem EDGE wireless modem includes and embedded TCP/IP stack to bring

Internet connectivity to any device without making changes to its hardware design. Using the Internet protocols
and the wireless connection to an IP network, it sends and receives data over the Internet.

SocketModem EDGE Pin-Out. The SocketModem EDGE wireless modem interfaces easily with existing

products through a standard serial communication channel. The serial DTE channel is capable of transfer
speeds of 460K bps and can be interfaced directly to an UART or microcontroller. The complete on-board RF
transceiver interfaces with an antenna for direct connection to wireless SMS, circuit-switched dial-up, or packet
data networks. It also includes an onboard LED to display network status.

Universal Socket Connectivity. Multi-Tech's Universal Socket flexible comm-port architecture provides analog

dial-up, ISDN, wireless, or Ethernet socket connectivity with interchangeable modules. This allows you to utilize
one system design and populate it with your communication module of choice. In addition, you are assured a
seamless migration to future technologies.

EDGE wireless modem integrates the

Developer’s Kit

The Developer’s Kit allows you to plug in the module and use it for testing, programming, and evaluation. The kit
includes:

• one development board with RS-232 DB-25 connector

• universal power supply

• antenna

• RS-232 cable

Technical Specifications

The SocketModem EDGE wireless modem meets the following specifications:

Packet Data

Circuit-Switched Data
Fax
SMS
Connectors

IP Protocols Supported
Power Requirements
Operating Environment
Physical Description

Certifications

Warranty

EDGE: E-GPRS Class 10, Modulation & coding scheme MCS 1-9, Mobile station Class B
GPRS: GPRS Class 12, full PBCCH support, coding scheme 1-4, Mobile station Class B

Asynchronous, transparent & non-transparent up to 9600 bps
Class 1 Group 3 Fax
Text & PDU, Point-to-Point, cell broadcast
Antenna: MMCX
SIM: Standard 3V SIM receptacle
TCP, UDP, DNS, FTP, SMTP, POP3, HTTP
5 VDC to 32 VDC; 400mA typical

-30° to +50° C

Dimensions: 2.55” L x 1.4” W x 0.5” H (6.48 cm x 3.5 cm x .87 cm)
Weight: 1 oz. (20 g)

CE Mark
EMC: FCC Part 2, 15, 22, 24, EN 55022 & EN55024
Safety: cUL, UL 60950, EN 60950
Network: PTCRB

2 years

Multi-Tech Systems, Inc. SocketModem EDGE Embedded Wireless Modem Developer’s Guide (S000376A) 5

Chapter 1 – Product Description and Specifications

Safety

Instructions to OEMs

The Multi-Tech product manual includes specific warnings and cautions in order to ensure that OEMs are aware
of their responsibilities, with regards to RF exposure compliance, for products into which the modem is
integrated. With this guidance, the OEM will be able to incorporate into their documentation the necessary
operating conditions and warnings.

OEMs need to provide a manual with the ‘’final’’ product that clearly states the operating requirements and
conditions and that these must be observed to ensure compliance with current FCC RF exposure requirements /
MPE limits (see the “RF Exposures” section below). This will enable the OEM to generate (and provide the end­user with) the appropriate operating instructions, warnings and cautions, and/or markings for their product.

IMPORTANT!

FOR THE EFFICIENT AND SAFE OPERATION OF YOUR E-GPRS
INTEGRATED MODEM, READ THIS INFORMATION BEFORE USE.

Radio Frequency (RF) Safety

General

Your SocketModem is based on the EGPRS standard for cellular technology. The standard is spread all
over the world. It covers Europe, Asia, and some parts of America and Africa. This is the most used
telecommunication standard. Your modem is actually a low power radio transmitter and receiver. It
sends out and receives radio frequency energy. When you use your SocketModem integrated modem,
the cellular system, which handles your calls controls both the radio frequency and the power level of
your cellular modem.

Exposure to RF Energy

There has been some public concern about possible health effects of using GSM modems. Although
research on health effects from RF energy has focused on the current RF technology for many years,
scientists have begun research regarding newer radio technologies, such as GSM. After existing
research had been reviewed, and after compliance to all applicable safety standards had been tested, it
has been concluded that the product was fitted for use. If you are concerned about exposure to RF
energy there are things you can do to minimize exposure. Obviously, limiting the duration of your calls
will reduce your exposure to RF energy. In addition, you can reduce RF exposure by operating your
cellular modem efficiently by following the below guidelines.

Efficient Modem Operation

For your modem to operate at the lowest power level, consistent with satisfactory call quality:

• If your modem has an extendible antenna, extend it fully. Some models allow you to place a call with

the antenna retracted. However your modem operates more efficiently with the antenna fully
extended.

• Do not hold the antenna when the modem is IN USE. Holding the antenna affects call quality and

may cause the modem to operate at a higher power level than needed.

Antenna Care and Replacement

Do not use the modem with a damaged antenna. If a damaged antenna comes into contact with the
skin, a minor burn may result. Replace a damaged antenna immediately. Consult your manual to see if
you may change the antenna yourself. If so, use only a manufacturer-approved antenna. Otherwise,
have your antenna repaired by a qualified technician. Use only the supplied or approved antenna.
Unauthorized antennas, modifications, or attachments could damage the modem and may contravene
local RF emission regulations or invalidate type approval.

Electronic Devices

Most electronic equipment, for example in hospitals and motor vehicles, is shielded from RF energy.
However, RF energy may affect some improperly shielded electronic equipment.

Vehicle Electronic Equipment

Check your vehicle manufacturer representative to determine if any on-board electronic equipment is
adequately shielded from RF energy.

Medical Electronic Equipment

Consult the manufacturer of any personal medical devices (such as pacemakers, hearing aids, etc.) to
determine if they are adequately shielded from external RF energy. Turn your modem OFF in health care
facilities when any regulations posted in the area instruct you to do so. Hospitals or health care facilities may
be using RF monitoring equipment.

Multi-Tech Systems, Inc. SocketModem EDGE Embedded Wireless Modem Developer’s Guide (S000376A) 6

Chapter 1 – Product Description and Specifications

Aircraft

Turn your modem OFF before boarding any aircraft.

• Use it on the ground only with crew permission.

• Do not use it in the air.

To prevent possible interference with aircraft systems, Federal Aviation Administration (FAA) regulations
require you to have permission from a crew member to use your modem while the aircraft is on the ground.
To prevent interference with cellular systems, local RF regulations prohibit using your modem while
airborne.

Handling Precautions

All devices must be handled with certain precautions to avoid damage due to the accumulation of static
charge. Although input protection circuitry has been incorporated into the devices to minimize the effect of
this static buildup, proper precautions should be taken to avoid exposure to electrostatic discharge during
handling and mounting.

Electromagnetic Interference (EMI) Considerations

The following guidelines are offered to specifically help minimize EMI generation. Some of these guidelines
are the same as, or similar to, the general guidelines but are mentioned again to reinforce their importance.
In order to minimize the contribution of the SocketModem-based design to EMI, the designer must
understand the major sources of EMI and how to reduce them to acceptable levels.

1. Keep traces carrying high frequency signals as short as possible.

2. Provide a good ground plane or grid. In some cases, a multilayer board may be required with full layers

for ground and power distribution.

3. Decouple power from ground with decoupling capacitors as close to the SocketModem module power

pins as possible.

4. Eliminate ground loops, which are unexpected current return paths to the power source and ground.

5. Decouple the telephone line cables at the telephone line jacks. Typically, use a combination of series

inductors, common mode chokes, and shunt capacitors. Methods to decouple telephone lines are
similar to decoupling power lines; however, telephone line decoupling may be more difficult and
deserves additional attention. A commonly used design aid is to place footprints for these components
and populate as necessary during performance/EMI testing and certification.

6. Decouple the power cord at the power cord interface with decoupling capacitors. Methods to decouple

power lines are similar to decoupling telephone lines.

7. Locate high frequency circuits in a separate area to minimize capacitive coupling to other circuits.

8. Locate cables and connectors so as to avoid coupling from high frequency circuits.

9. Lay out the highest frequency signal traces next to the ground grid.

10. If a multilayer board design is used, make no cuts in the ground or power planes and be sure the

ground plane covers all traces.

11. Minimize the number of through-hole connections on traces carrying high frequency signals.

12. Avoid right angle turns on high frequency traces. Forty-five degree corners are good; however, radius

turns are better.

13. On 2-layer boards with no ground grid, provide a shadow ground trace on the opposite side of the board

to traces carrying high frequency signals. This will be effective as a high frequency ground return if it is
three times the width of the signal traces.

14. Distribute high frequency signals continuously on a single trace rather than several traces radiating from

one point.

Driving

Check the laws and the regulations regarding the use of cellular devices in the area where you have to drive
as you must comply with these laws and regulations. When using your modem while driving, please give full
attention to driving. Pull off the road and park before making or answering a call if driving conditions so
require.

Children

Do not allow children to play with your modem. It is not a toy. Children could hurt themselves or others (by
poking themselves or others in the eye with the antenna, for example). Children could damage the modem
or make calls that increase your modem bills.

Blasting Areas

To avoid interfering with blasting operations, turn your unit OFF when in a “blasting area” or in areas posted
“turn off two-way radio”. Construction crews often use remote control RF devices to set off explosives.

Multi-Tech Systems, Inc. SocketModem EDGE Embedded Wireless Modem Developer’s Guide (S000376A) 7