Due to the nature of wireless communications, transmission and reception of data
can never be guaranteed. Data may be delayed, corrupted (i.e., have errors) or be
totally lost. Although significant delays or losses of data are rare when wireless
devices such as the Sierra Wireless modem are used in a normal manner with a
well-constructed network, the Sierra Wireless modem should not be used in
situations where failure to transmit or receive data could result in damage of any
kind to the user or any other party, including but not limited to personal injury,
death, or loss of property. Sierra Wireless accepts no responsibility for damages
of any kind resulting from delays or errors in data transmitted or received using
the Sierra Wireless modem, or for failure of the Sierra Wireless modem to
transmit or receive such data.
Do not operate the Sierra Wireless modem in areas where blasting is in progress,
where explosive atmospheres may be present, near medical equipment, near life
support equipment, or any equipment which may be susceptible to any form of
radio interference. In such areas, the Sierra Wireless modem MUST BE POWERED OFF. The Sierra Wireless modem can transmit signals that could
interfere with this equipment.
Do not operate the Sierra Wireless modem in any aircraft, whether the aircraft is
on the ground or in flight. In aircraft, the Sierra Wireless modem MUST BE POWERED OFF. When operating, the Sierra Wireless modem can transmit
signals that could interfere with various onboard systems.
Limitation of
Liability
Note: Some airlines may permit the use of cellular phones while the aircraft is on the
ground and the door is open. Sierra Wireless modems may be used at this time.
The driver or operator of any vehicle should not operate the Sierra Wireless
modem while in control of a vehicle. Doing so will detract from the driver or
operator's control and operation of that vehicle. In some states and provinces,
operating such communications devices while in control of a vehicle is an offence.
The information in this manual is subject to change without notice and does not
represent a commitment on the part of Sierra Wireless. SIERRA WIRELESS AND
ITS AFFILIATES SPECIFICALLY DISCLAIM LIABILITY FOR ANY AND ALL
DIRECT, INDIRECT, SPECIAL, GENERAL, INCIDENTAL, CONSEQUENTIAL,
PUNITIVE OR EXEMPLARY DAMAGES INCLUDING, BUT NOT LIMITED TO,
LOSS OF PROFITS OR REVENUE OR ANTICIPATED PROFITS OR REVENUE
ARISING OUT OF THE USE OR INABILITY TO USE ANY SIERRA WIRELESS
PRODUCT, EVEN IF SIERRA WIRELESS AND/OR ITS AFFILIATES HAS BEEN
ADVISED OF THE POSSIBILITY OF SUCH DAMAGES OR THEY ARE
FORESEEABLE OR FOR CLAIMS BY ANY THIRD PARTY.
Notwithstanding the foregoing, in no event shall Sierra Wireless and/or its
affiliates aggregate liability arising under or in connection with the Sierra Wireless
product, regardless of the number of events, occurrences, or claims giving rise to
liability, be in excess of the price paid by the purchaser for the Sierra Wireless
product.
Rev 1 Sep.15Proprietary and Confidential - Contents subject to change3
Page 4
Hardware Integration Guide
PatentsThis product may contain technology developed by or for Sierra Wireless Inc.
This product includes technology licensed from QUALCOMM®.
This product is manufactured or sold by Sierra Wireless Inc. or its affiliates under
one or more patents licensed from InterDigital Group and MMP Portfolio
Licensing.
Rev 1 Sep.15Proprietary and Confidential - Contents subject to change5
Page 6
Hardware Integration Guide
6Proprietary and Confidential - Contents subject to change4118013
Page 7
1: Introduction
The Sierra Wireless MC7455 PCI Express Mini Card is a compact,
lightweight, wireless LTE- and UMTS-based modem that provides
LTE, UMTS, and GNSS connectivity for M2M applications, notebook,
ultrabook and tablet computers over several radio frequency bands.
Accessories
A hardware development kit is available for AirPrime MC-series
modules. The kit contains hardware components for evaluating and
developing with the module, including:
•Development board
•Cables
•Antennas (Additional antennas may be required to support all
bands.)
•Initial allotment of support hours
•Other accessories
For over-the-air LTE testing, ensure that suitable antennas are used.
Required Connectors
1
Ta bl e 1-1 describes the connectors used to integrate the MC7455
Mini Card into your host device.
Table 1-1: Required host-module connectors
Connector typeDescription
RF cables•Mate with Hirose U.FL connectors
(model U.FL #CL331-0471-0-10)
•Three connector jacks
EDGE (52-pin)•Industry-standard mating connector
•Some manufacturers include Tyco, Foxconn, Molex
•Example: UDK board uses Molex 67910-0001
SIM•Industry-standard connector. Type depends on how host
device exposes the SIM socket
•Example: UDK board uses ITT CCM03-3518
1. Manufacturers / part numbers are for reference only and are subject to change. Choose
connectors that are appropriate for your own design.
1
Rev 1 Sep.15Proprietary and Confidential - Contents subject to change7
Page 8
Hardware Integration Guide
8Proprietary and Confidential - Contents subject to change4118013
Page 9
2: Power
2
Power Supply
The host provides power to the MC7455 through multiple power and
ground pins. The host must provide safe and continuous power at all
times; the module does not have an independent power supply, or
protection circuits to guard against electrical issues.
For detailed pinout and voltage / current requirements of this module,
see the AirPrime MC7455 Product Technical Specification.
Module Power States
Table 2-1: Module power states
StateDetails
Normal
(Default
state)
Low power
(‘Airplane
mode’)
•Module is active
•Default state when VCC is first applied in the absence of W_DISABLE_N control
•Module is capable of placing / receiving calls, or establishing data connections on the
wireless network
•Current consumption is affected by several factors, including:
• Radio band being used
• Transmit power
• Receive gain settings
• Data rate
• Number of active Tx time slots
•Module is active
•Module enters this state:
• Under host interface control:
• Automatically, when critical temperature or voltage trigger limits have been
The module has five power states, as described in
·Host issues AT+CFUN=0 (
(Release 6) (Doc# 3GPP TS 27.007)
·If the module is currently configured to power on/off using W_DISABLE_N, the
host must issue AT!PCOFFEN=0 to configure the modem to enter low power
mode when W_DISABLE_N is asserted. Note: This is a persistent configuration option.
·Once the modem has been configured (AT!PCOFFEN=0), the host can assert
W_DISABLE_N to enter low power mode.
reached
[1] AT Command Set for User Equipment (UE)
)), or
Ta bl e 2-1.
Host is powered
Module is powered
USB interface active
RF enabled
Rev 1 Sep.15Proprietary and Confidential - Contents subject to change9
Page 10
Hardware Integration Guide
Table 2-1: Module power states (Continued)
StateDetails
Sleep•Normal state of module between calls or data connections
•Module cycles between wake (polling the network) and sleep, at network provider-
determined interval.
Host is powered
Module is powered
USB interface active
RF enabled
Disconnected •Host power source is disconnected from the module and all voltages associated with
the module are at 0 V.
10Proprietary and Confidential - Contents subject to change4118013
Page 11
3: RF Specifications
The MC7455 operates on the frequency bands listed below.
Table 3-1: LTE Frequency Band Support1
BandFrequency (Tx)Frequency (Rx)
Band 11920–1980 MHz2110–2170 MHz
Band 21850–1910 MHz1930–1990 MHz
Band 31710–17851805–1880 MHz
Band 41710–17552110–2155 MHz
Band 5824–849 MHz869–894 MHz
Band 72500–2570 MHz2620–2690 MHz
Band 8880–915 MHz925–960 MHz
Band 12699–716 MHz729–746 MHz
Band 13777–787 MHz746–756 MHz
Band 20832–862 MHz791–821 MHz
Band 251850–1915 MHz1930–1995 MHz
3
Band 26814–849 MHz859–894 MHz
Band 29n/a717–728 MHz
Band 302305–2315 MHz2350–2360 MHz
Band 412496–2690 MHz (TDD)
1. For bandwidth support details, see 3GPP TS 36.521-1 v11.3.0, table
5.4.2.1-1
Table 3-2: WCDMA Frequency Band Support
1
Band
Band 11920–1980 MHz2110–2170 MHz
Band 21850–1910 MHz1930–1990 MHz
Band 31710–1785 MHz1805–1880 MHz
Band 41710–1755 MHz2110–2155 MHz
Band 5824–849 MHz869–894 MHz
Band 8880–915 MHz925–960 MHz
1. WCDMA channel spacing is 5 MHz, but this can be adjusted to optimize
performance in a particular deployment scenario.
Frequency (Tx)Frequency (Rx)
Rev 1 Sep.15Proprietary and Confidential - Contents subject to change11
Page 12
Hardware Integration Guide
Table 3-3: GNSS Frequency Band Support
RF Connections
When attaching antennas to the module:
•Use Hirose U.FL connectors (3 mm x 3 mm, low profile; model
•Match coaxial connections between the module and the antenna to 50 .
•Minimize RF cable losses to the antenna; the recommended maximum cable
•To ensure best thermal performance, mounting holes must be used to attach
BandFrequencies
Narrow-band GPS, GalileoRx: 1575.42 MHz
Wide-band GPS + GLONASSRx: 1560–1606 MHz
Narrow-band BeiDouRx: 1561.098 MHz
Narrow-band GLONASSRx: 1601.72 MHz
U.FL #CL331-0471-0-10) to attach antennas to connection points on the
module
loss for antenna cabling is 0.5 dB.
(ground) the device to the main PCB ground or a metal chassis.
.
Note: If the antenna connection is shorted or open, the modem will not sustain permanent
damage.
Shielding
The module is fully shielded to protect against EMI and must not be removed.
Antenna and Cabling
When selecting the antenna and cable, it is critical to RF performance to match
antenna gain and cable loss.
Choosing the Correct Antenna and Cabling
When matching antennas and cabling:
•The antenna (and associated circuitry) should have a nominal impedance of
50 with a recommended return loss of better than 10 dB across each
frequency band of operation.
•The system gain value affects both radiated power
CE, etc.) test results.
Designing Custom Antennas
and regulatory (FCC, IC,
Consider the following points when designing custom antennas:
•A skilled RF engineer should do the development to ensure that the RF
performance is maintained.
12Proprietary and Confidential - Contents subject to change4118013
Page 13
RF Specifications
•If both UMTS and CDMA modules will be installed in the same platform, you
may want to develop separate antennas for maximum performance.
Determining the Antenna’s Location
When deciding where to put the antennas:
•Antenna location may affect RF performance. Although the module is
shielded to prevent interference in most applications, the placement of the
antenna is still very important — if the host device is insufficiently shielded,
high levels of broadband or spurious noise can degrade the module’s performance.
•Connecting cables between the module and the antenna must have 50
impedance. If the impedance of the module is mismatched, RF performance
is reduced significantly.
•Antenna cables should be routed, if possible, away from noise sources
(switching power supplies, LCD assemblies, etc.). If the cables are near the
noise sources, the noise may be coupled into the RF cable and into the
antenna.
Disabling the Diversity Antenna
Use the AT command
enable receive diversity.
Note: A diversity antenna is used to improve connection quality and reliability through
redundancy. Because two antennas may experience difference interference effects (signal
distortion, delay, etc.), when one antenna receives a degraded signal, the other may not be
similarly affected.
!RXDEN=0 to disable receive diversity or !RXDEN=1 to
Ground Connection
When connecting the module to system ground:
•Prevent noise leakage by establishing a very good ground connection to the
module through the host connector.
•Connect to system ground using the two mounting holes at the top of the
module.
•Minimize ground noise leakage into the RF.
Depending on the host board design, noise could potentially be coupled to
the module from the host board. This is mainly an issue for host designs that
have signals traveling along the length of the module, or circuitry operating at
both ends of the module interconnects.
Interference and Sensitivity
Several interference sources can affect the module’s RF performance
(RF desense). Common sources include power supply noise and devicegenerated RF.
Rev 1 Sep.15Proprietary and Confidential - Contents subject to change13
Page 14
Hardware Integration Guide
RF desense can be addressed through a combination of mitigation techniques
(Methods to Mitigate Decreased Rx Performance on page 15) and radiated
sensitivity measurement (Radiated Sensitivity Measurement on page 15).
Note: The MC7455 is based on ZIF (Zero Intermediate Frequency) technologies. When
performing EMC (Electromagnetic Compatibility) tests, there are no IF (Intermediate
Frequency) components from the module to consider.
Interference From Other Wireless Devices
Wireless devices operating inside the host device can cause interference that
affects the module.
To determine the most suitable locations for antennas on your host device,
evaluate each wireless device’s radio system, considering the following:
•Any harmonics, sub-harmonics, or cross-products of signals generated by
•The Tx power and corresponding broadband noise of other wireless devices
wireless devices that fall in the module’s Rx range may cause spurious
response, resulting in decreased Rx performance.
may overload or increase the noise floor of the module’s receiver, resulting in
Rx desense.
The severity of this interference depends on the closeness of the other antennas
to the module’s antenna. To determine suitable locations for each wireless
device’s antenna, thoroughly evaluate your host device’s design.
Host-generated RF Interference
All electronic computing devices generate RF interference that can negatively
affect the receive sensitivity of the module.
Proximity of host electronics to the antenna in wireless devices can contribute to
decreased Rx performance. Components that are most likely to cause this
include:
•Microprocessor and memory
•Display panel and display drivers
•Switching-mode power supplies
Device-generated RF Interference
The module can cause interference with other devices. Wireless devices such as
AirPrime embedded modules transmit in bursts (pulse transients) for set durations
(RF burst frequencies). Hearing aids and speakers convert these burst
frequencies into audible frequencies, resulting in audible noise.
14Proprietary and Confidential - Contents subject to change4118013
Page 15
RF Specifications
Methods to Mitigate Decreased Rx
Performance
It is important to investigate sources of localized interference early in the design
cycle. To reduce the effect of device-generated RF on Rx performance:
•Put the antenna as far as possible from sources of interference. The
drawback is that the module may be less convenient to use.
•Shield the host device. The module itself is well shielded to avoid external
interference. However, the antenna cannot be shielded for obvious reasons.
In most instances, it is necessary to employ shielding on the components of
the host device (such as the main processor and parallel bus) that have the
highest RF emissions.
•Filter out unwanted high-order harmonic energy by using discrete filtering on
low frequency lines.
•Form shielding layers around high-speed clock traces by using multi-layer
PCBs.
•Route antenna cables away from noise sources.
Radiated Spurious Emissions (RSE)
When designing an antenna for use with AirPrime embedded modules, the host
device with an AirPrime embedded module must satisfy any applicable
standards / local regulatory bodies for radiated spurious emission (RSE) for
receive-only mode and for transmit mode (transmitter is operating).
Note that antenna impedance affects radiated emissions, which must be
compared against the conducted 50-ohm emissions baseline. (AirPrime
embedded modules meet the 50-ohm conducted emissions requirement.)
Radiated Sensitivity Measurement
A wireless host device contains many noise sources that contribute to a reduction
in Rx performance.
To determine the extent of any receiver performance desensitization due to selfgenerated noise in the host device, over-the-air (OTA) or radiated testing is
required. This testing can be performed by Sierra Wireless or you can use your
own OTA test chamber for in-house testing.
Rev 1 Sep.15Proprietary and Confidential - Contents subject to change15
Page 16
Hardware Integration Guide
16Proprietary and Confidential - Contents subject to change4118013
Page 17
4: Regulatory Compliance and Industry
Certifications
This module is designed to meet, and upon commercial release will
meet, the requirements of the following regulatory bodies and
regulations, where applicable:
•Federal Communications Commission (FCC) of the United States
•The Certification and Engineering Bureau of Industry Canada
(IC)
•The National Communications Commission (NCC) of Taiwan,
Republic of China
•Ministry of Internal Affairs and Communications (MIC) of Japan
•Radio Equipment and Telecommunications Terminal Equipment
(R&TTE) Directive of the European Union
Upon commercial release, the following industry certifications will
have been obtained, where applicable:
•GCF
•PTCRB
Additional certifications and details on specific country approvals may
be obtained upon customer request — contact your Sierra Wireless
account representative for details.
4
Additional testing and certification may be required for the end
product with an embedded MC7455 module and are the
responsibility of the OEM. Sierra Wireless offers professional
services-based assistance to OEMs with the testing and certification
process, if required.
Important Notice
Because of the nature of wireless communications, transmission and
reception of data can never be guaranteed. Data may be delayed,
corrupted (i.e., have errors) or be totally lost. Although significant
delays or losses of data are rare when wireless devices such as the
Sierra Wireless module are used in a normal manner with a wellconstructed network, the Sierra Wireless module should not be used
in situations where failure to transmit or receive data could result in
damage of any kind to the user or any other party, including but not
limited to personal injury, death, or loss of property. Sierra Wireless
and its affiliates accept no responsibility for damages of any kind
resulting from delays or errors in data transmitted or received using
the Sierra Wireless module, or for failure of the Sierra Wireless
module to transmit or receive such data.
Rev 1 Sep.15Proprietary and Confidential - Contents subject to change17
Page 18
Hardware Integration Guide
Safety and Hazards
Do not operate your MC7455 module:
•In areas where blasting is in progress
•Where explosive atmospheres may be present including refuelling points, fuel
•Near medical equipment, life support equipment, or any equipment which
In an aircraft, the MC7455 module MUST BE POWERED OFF. Otherwise, the
MC7455 module can transmit signals that could interfere with various onboard
systems and may be dangerous to the operation of the aircraft or disrupt the
cellular network. Use of a cellular phone in an aircraft is illegal in some
jurisdictions. Failure to observe this instruction may lead to suspension or denial
of cellular telephone services to the offender, or legal action or both.
Some airlines may permit the use of cellular phones while the aircraft is on the
ground and the door is open. The MC7455 module may be used normally at this
time.
depots, and chemical plants
may be susceptible to any form of radio interference. In such areas, the
MC7455 module MUST BE POWERED OFF. Otherwise, the MC7455 module
can transmit signals that could interfere with this equipment.
Important Compliance Information For
North American Users
The MC7455 module, upon commercial release, will have been granted modular
approval for mobile applications. Integrators may use the MC7455 module in their
final products without additional FCC / IC (Industry Canada) certification if they
meet the following conditions. Otherwise, additional FCC / IC approvals must be
obtained.
1. At least 20 cm separation distance between the antenna and the user’s body
must be maintained at all times.
2. To comply with FCC / IC regulations limiting both maximum RF output power
and human exposure to RF radiation, the maximum antenna gain including
cable loss in a mobile-only exposure condition must not exceed the limits
stipulated in
Ta bl e 4-1 on page 19.
18Proprietary and Confidential - Contents subject to change4118013
Page 19
Regulatory Compliance and Industry Certifications
Table 4-1: Antenna Gain Specifications
DeviceTechnologyBandFrequency
(MHz)
MC7455 Mini CardLTE21850–19106
41710–17556
5824–8496
72500–25709
12699–7166
13777–7876
251850–19156
26814–8496
302305–23151
412496–26909
UMTS21850–19106
41710–17556
5824–8496
Maximum antenna
gain (dBi)
3. The MC7455 module may transmit simultaneously with other collocated radio
transmitters within a host device, provided the following conditions are met:
· Each collocated radio transmitter has been certified by FCC / IC for mobile
application.
· At least 20 cm separation distance between the antennas of the collocated
transmitters and the user’s body must be maintained at all times.
· The radiated power of a collocated transmitter must not exceed the EIRP
limits stipulated in
Ta bl e 4-2
.
Table 4-2: Collocated Radio Transmitter Specifications
Collocated
transmitters
Rev 1 Sep.15Proprietary and Confidential - Contents subject to change19
DeviceTechnologyFrequency
(MHz)
1
1. Valid collocated transmitter combinations: WLAN+BT; WiMAX+BT.
(WLAN+WiMAX+BT is not permitted.)
WLAN2400–250025
5150–585027
WiMAX2300–240025
2500–270025
3300–380025
BT2400–250015
EIRP Limit
(dBm)
Page 20
Hardware Integration Guide
4. A label must be affixed to the outside of the end product into which the
5. A user manual with the end product must clearly indicate the operating
The end product with an embedded MC7455 module may also need to pass the
FCC Part 15 unintentional emission testing requirements and be properly
authorized per FCC Part 15.
Note: If this module is intended for use in a portable device, you are responsible
for separate approval to satisfy the SAR requirements of FCC Part 2.1093 and
IC RSS-102.
MC7455 module is incorporated, with a statement similar to the following:
· This device contains FCC ID: N7NMC7455
Contains transmitter module IC: 2417C-MC7455 where 2417C-MC7455
is the module’s certification number.
requirements and conditions that must be observed to ensure compliance
with current FCC / IC RF exposure guidelines.
20Proprietary and Confidential - Contents subject to change4118013
Page 21
5: Acronyms
Table 5-1: Acronyms and Definitions
Acronym or termDefinition
5
3GPP
BeiDou
BER
BLER
dB
dBm
DC-HSPA+
EMC
EMI
FCC
3rd Generation Partnership Project
BeiDou Navigation Satellite System
A Chinese system that uses a series of satellites in geostationary and middle
earth orbits to provide navigational data.
Bit Error Rate — A measure of receive sensitivity
Block Error Rate
Decibel = 10 x log10 (P1 / P2)
P1 is calculated power; P2 is reference power
Decibel = 20 x log10 (V1 / V2)
V1 is calculated voltage, V2 is reference voltage
A logarithmic (base 10) measure of relative power (dB for decibels); relative to
milliwatts (m). A dBm value will be 30 units (1000 times) larger (less negative)
than a dBW value, because of the difference in scale (milliwatts vs. watts).
Dual Carrier HSPA+
Electromagnetic Compatibility
Electromagnetic Interference
Federal Communications Commission
The U.S. federal agency that is responsible for interstate and foreign
communications. The FCC regulates commercial and private radio spectrum
management, sets rates for communications services, determines standards for
equipment, and controls broadcast licensing. Consult
www.fcc.gov.
Galileo
GCF
GLONASS
GNSS
GPS
Host
HSDPA
HSPA+
HSUPA
A European system that uses a series of satellites in middle earth orbit to provide
navigational data.
Global Certification Forum
Global Navigation Satellite System — A Russian system that uses a series of 24
satellites in middle circular orbit to provide navigational data.
Global Navigation Satellite Systems (GPS, GLONASS, BeiDou, and Galileo)
Global Positioning System
An American system that uses a series of 24 satellites in middle circular orbit to
provide navigational data.
The device into which an embedded module is integrated
High Speed Downlink Packet Access
Enhanced HSPA, as defined in 3GPP Release 7 and beyond
High Speed Uplink Packet Access
Rev 1 Sep.15Proprietary and Confidential - Contents subject to change21
Page 22
Hardware Integration Guide
Table 5-1: Acronyms and Definitions (Continued)
Acronym or termDefinition
Hz
IC
IF
IS
LTE
MHz
OEM
OTA
PCB
PCS
PTCRB
RF
RSE
Hertz = 1 cycle / second
Industry Canada
Intermediate Frequency
Interim Standard.
After receiving industry consensus, the TIA forwards the standard to ANSI for
approval.
Long Term Evolution—a high-performance air interface for cellular mobile
communication systems.
Megahertz = 10e6 Hz
Original Equipment Manufacturer—a company that manufactures a product and
sells it to a reseller.
‘Over the air’ (or radiated through the antenna)
Printed Circuit Board
Personal Communication System
A cellular communication infrastructure that uses the 1.9 GHz radio spectrum.
PCS Type Certification Review Board
Radio Frequency
Radiated Spurious Emissions
Sensitivity (RF)
SNR
TIA/EIA
UMTS
USB
VCC
WCDMA
WLAN
ZIF
Measure of lowest power signal at the receiver input that can provide a prescribed
BER / BLER / SNR value at the receiver output.
Signal-to-Noise Ratio
Telecommunications Industry Association / Electronics Industry Association.
A standards setting trade organization, whose members provide communications
and information technology products, systems, distribution services and
professional services in the United States and around the world. Consult
www.tiaonline.org.
Universal Mobile Telecommunications System
Universal Serial Bus
Supply voltage
Wideband Code Division Multiple Access (also referred to as UMTS)
Wireless Local Area Network
Zero Intermediate Frequency
22Proprietary and Confidential - Contents subject to change4118013
Page 23
Index
A
accessories, 7
acronyms and definitions, 21– 22
antenna