ST1955 FCC IC Instruction For Use_V21_III
02 Aug. 21
Instruction for FCC/IC compliant use
Stream1955
Network Audio Streaming Module
Version:
Authors:
Reviewer:
Date:
2.1
02 Aug. 21
C. Apel/C.Arnardi
Page 1 of 13
StreamUnlimited Engineering GmbH
Gutheil-Schoder-G. 10, 1100 Vienna, Austria
T +43-1-667 2002, F +43-1-667 2002 4401
ST1955 FCC IC Instruction For Use_V21_III
02 Aug. 21
Table of contents
Instruction for FCC/IC compliant use .............................................................................. 1
1.
Document History ............................................................................................. 3
Confidentiality Notice ....................................................................................................... 3
Copyright Notice .............................................................................................................. 3
Document Version Management Notice ........................................................................... 3
2. Granted certificates .......................................................................................... 4
3.
Conditions for re-use of modular certification ............................................... 5
3.1 Product labelling requirements .............................................................................. 6
Instruction for use requirements ............................................................................ 7
3.2
3.2.1 USA : .................................................................................................................. 7
3.2.2 Canada: .............................................................................................................. 9
4.
Antenna type and connections ..................................................................... 10
4.1 Antenna’s valid configurations..............................................................................12
EMC application notes ................................................................................... 13
5.
Page 2 of 13
StreamUnlimited Engineering GmbH
Gutheil-Schoder-G. 10, 1100 Vienna, Austria
T +43-1-667 2002, F +43-1-667 2002 4401
ST1955 FCC IC Instruction For Use_V21_III
02 Aug. 21
1. Document History
No.
1.0
Primary Author(s) Description of Version
Date Completed
C. Apel
Initial version
1.1
C. Apel
Update conditions for referring to
modular certification
2019-11-14
2020-01-10
2.0
C. Arnardi
Initial version AP6275S
2021-05-14
2.1
C. Apel
2.2
C.Arnardi
Changed FCC/IC IDs for
AP6275S, updated antenna list
2021-06-14
Adding antenna configuration
example and new specifications
Adding applicable FCC/IC rule list
2021-06-30
Confidentiality Notice
The information contained in this document is confidential information property of
StreamUnlimited Engineering GmbH. No part of this document may be used or reproduced
without written permission.
Copyright Notice
All rights reserved. No part of this work covered by the owners copyright may be reproduced or
copied in any form or by any means (graphic, electronic or mechanical, including photocopying,
recording, taping or information retrieval systems) without written permission.
Document Version Management Notice
Updates of this document will be done without notice. The latest document version is available
on request.
Page 3 of 13
StreamUnlimited Engineering GmbH
Gutheil-Schoder-G. 10, 1100 Vienna, Austria
T +43-1-667 2002, F +43-1-667 2002 4401
ST1955 FCC IC Instruction For Use_V21_III
02 Aug. 21
2. Granted certificates
FCC
47 CFR Part 15
FCC Part 15.247
FCC Part 15.407
FCC Part 15.247
IC
RSS-247
ETSI
EN 301 893 V2.1.1
EN 300 440 V2.1.1
EN 300 328 V2.2.2
DTS WIFI 2.4 GHz 802.11 b/g/n/ax
UNII WIFI 5GHz 802.11 a/n/ac/ax
DSS Bluetooth 4.2/ BLE
802.11 a/c/g/n/ac/ax
Bluetooth 4.2 / Bluetooth Low-energy
WIFI 5 GHz 802.11 a/n/ac/ax
WIFI 2.4 GHz 802.11 b/g/n/ax
Bluetooth 4.2 / Bluetooth Low-energy
Additional Testing, Part 15 Subpart B Disclaimer :
The module is only FCC authorized for the specific rule parts listed on the grant. The host
product manufacturer is responsible for compliance to any other FCC rules that apply to the
host not covered by the modular transmitter grant of certification. The final host product still
requires Part 15 Subpart B compliance testing with the modular transmitter installed.
Page 4 of 13
StreamUnlimited Engineering GmbH
Gutheil-Schoder-G. 10, 1100 Vienna, Austria
T +43-1-667 2002, F +43-1-667 2002 4401
ST1955 FCC IC Instruction For Use_V21_III
02 Aug. 21
3. Conditions for re-use of modular certification
4.
2.
3.
6.
5.
7.
8.
9.
10.
11.
12.
To make use of modular certification, product level MUST comply with ALL rules mentioned below. If
these conditions cannot be met, then the FCC authorization is no longer considered to be valid and
StreamUnlimited's FCC ID may not be used on the final product. In these circumstances the host
integrator is responsible for evaluating the final product and obtaining a separate FCC authorization.
1.
ONLY antennas listed under section 4 are used.
Equivalent antennas of same type and of equal or lower gain and similar in-band and out-of-
band characteristics can be included in the modular certification.
Costs for compliance testing and formal approval process will need to be covered.
Antennas must be oriented orthogonally to each other and spaced at a minimum distance
of 18 cm [see “Antenna testing configuration” for detailed arrangement].
The antenna(s) used for this transmitter must not transmit simultaneously with any other
antenna or transmitter, except in accordance with FCC multi-transmitter product procedures.
All equipment shall be considered to operate in a “general population/uncontrolled”
environment.
In order to comply with SAR requirements, host integrator must ensure that the final device is
for mobile use and that the antennas are at least 20 cm from the end user.
The WiFi output power configurations which are stored in “NVRAM file” must remain
unchanged.
Regulatory domain is set to world-wide or set to “US”.
Regulatory domain configuration is not accessible for end-user (StreamSDK Software does not
allow such access).
The Bluetooth output power which is hard-coded in firmware to 6dB remains unchanged.
Product labelling requirements are met (see section 3.1).
Instructions for use requirements are met (see section 3.2).
The product is secured against tampering with the software via local access or by changing the
software update image.
Additional notes:
Ad 3):
The integrator should check for emissions that may occur due to the intermixing of
emissions with the other transmitters, digital circuitry, or due to physical properties of
the host product (enclosure). This investigation is especially important when
integrating multiple modular transmitters where the certification is based on testing
each of them in a stand-alone configuration. It is important to note that host product
manufacturers should not assume that because the modular transmitter is certified that they do not
have any responsibility for final product compliance.
Page 5 of 13
StreamUnlimited Engineering GmbH
Gutheil-Schoder-G. 10, 1100 Vienna, Austria
T +43-1-667 2002, F +43-1-667 2002 4401
ST1955 FCC IC Instruction For Use_V21_III
02 Aug. 21
Additional Testing, Part 15 Subpart B Disclaimer :
The module is only FCC authorized for the specific rule parts listed on the grant, and that the
host product manufacturer is responsible for compliance to any other FCC rules that apply to the
host not covered by the modular transmitter grant of certification. The final host product still
requires Part 15 Subpart B compliance testing with the modular transmitter installed.
Please refer to the following document for test modes :
- Stream1955 Certification Guidelines_V01_8
Can be obtained by contacting your contact at StreamUnlimited
See SAR GUIDANCE FOR IEEE 802.11 (Wi-Fi) TRANSMITTERS
https://apps.fcc.gov/kdb/GetAttachment.html?id=ARcyvK1h4uoKj8FLtKtPkQ%3D%3D&desc=248227%
20D01%20802%2011%20Wi-Fi%20SAR%20v02r02&tracking_number=28238
Ad 6):
StreamUnlimited provide NVRAM files for “CE” and for “FCC” configurations. Region is selected during
end-product configuration prior to product encasing. In the same step, also the country which the
product is intended for should be configured.
In the case that no region is configured, the NVRAM for “CE” will be selected as default and
“worldwide” will be selected as country. This will result in the most restricted configuration.
Note that those configurations must not be exposed to the end user. When used with StreamSDK
Software stack, this requirement is met.
Ad 12):
A secure update mechanism is used by StreamUnlimited to prevent modification of the update image.
Tools for locking the SoC after product-level testing are provided. This prevents local access to the
software. If not using software of StreamUnlimited, a similar approach must be taken to prevent
tampering with the system either via direct access of by modification of the update software image.
3.1 Product labelling requirements
If the FCC identification number of the module is not visible when the module is installed inside
another device, then the outside of the device into which the module is installed must also
display a label referring to the enclosed module.
Product label must contain following text:
“contains FCC ID: 2AJYB-ST1955”
“contains IC: 20504-ST1955”
See below example for reference
Page 6 of 13
StreamUnlimited Engineering GmbH
Gutheil-Schoder-G. 10, 1100 Vienna, Austria
T +43-1-667 2002, F +43-1-667 2002 4401
ST1955 FCC IC Instruction For Use_V21_III
02 Aug. 21
3.2
Instruction for use requirements
USA :
To comply with the FCC and ISED rules the OEM/host integrator shall include the following
statements on the device, packaging and in the user manual, as applicable.
3.2.1
The device shall bear the following statement in a conspicuous location on the device.
When the device is so small or for such use that it is impracticable to label it with the statement
in a font that is four-point or larger, and the device does not have a display that can show
electronic labeling, then the information required by this paragraph shall be placed in the user
manual and must also either be placed on the device packaging or on a removable label
attached to the device.
Where a device is constructed in two or more sections connected by wires and marketed
together, the statement is required to be affixed only to the main control unit.
Declaration of Conformity
This device complies with Part 15 of the FCC Rules.
Operation is subject to the following two conditions:
(1) this device may not cause harmful interference, and
(2) this device must accept any interference received, including interference that may cause
undesired operation.
This product does not contain any user serviceable components. Any unauthorized product
changes or modifications will invalidate warranty and all applicable regulatory certifications and
approvals, including authority to operate this device.
The user manual shall contain the following statements.
Warning
This equipment has been tested and found to comply with the limits for a Class B digital device,
pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable
protection against harmful interference in a residential installation.
This equipment generates, uses and can radiate radio frequency energy and, if not installed and
used in accordance with the instructions, may cause harmful interference to radio
communications.
Page 7 of 13
StreamUnlimited Engineering GmbH
Gutheil-Schoder-G. 10, 1100 Vienna, Austria
T +43-1-667 2002, F +43-1-667 2002 4401
ST1955 FCC IC Instruction For Use_V21_III
02 Aug. 21
However, there is no guarantee that interference will not occur in a particular installation. If this
equipment does cause harmful interference to radio or television reception, which can be
determined by turning the equipment off and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
•
• Connect the equipment into an outlet on a circuit different from that to which the receiver
Increase the separation between the equipment and receiver.
is connected.
• Consult the dealer or an experienced radio /TV technician for help.
Caution:
Changes or modifications not expressly approved by the party responsible for compliance could
void the user's authority to operate the equipment.
Operations in the 5.15 – 5.25GHz band are restricted to indoor usage only.
RF Exposure Requirements
Radiofrequency radiation exposure Information:
This equipment complies with radiation exposure limits prescribed for an uncontrolled
environment for fixed and mobile use conditions.This transmitter must not be co-located or
operating in conjunction with any other antenna or transmitter except as authorized in the
certification of the product.
To comply with FCC requirements, a minimum separation distance of 20cm (8 inches) is
required between the equipment and the body of the user or nearby persons.
Page 8 of 13
StreamUnlimited Engineering GmbH
Gutheil-Schoder-G. 10, 1100 Vienna, Austria
T +43-1-667 2002, F +43-1-667 2002 4401
ST1955 FCC IC Instruction For Use_V21_III
02 Aug. 21
Canada:
3.2.2
User manuals shall contain the following text, or an equivalent notice, that shall be displayed in a
conspicuous location, either in the user manual or on the device, or both.
The statements must be included in both English and French.
This Class B digital apparatus complies with Canadian ICES-003 and RSS-247.
Operation is subject to the following two conditions:
(1) This device may not cause harmful interference, and
(2) This device must accept any interference received, including interference that may cause
undesired operation.
The installer of this radio equipment must ensure that the product is located such that it does not
emit RF field in excess of Health Canada limits for the general population: consult Safety Code
6, obtainable from Health Canada´s We site www.hc-sc.gc.ca/rpb.
As mentioned before, the installer cannot control the antenna orientation. However, they could
place the complete product in a way that causes the problem mentioned above.
The device for operation in the band 5150-5250 MHz is only for indoor use to reduce the
potential for harmful interference to co-channel mobile satellite systems.
Be advices that high-power radars are allocated as primary users (i.e. priority users) of the
bands 5250-5350MHz and 5650-5850MHz and that these radars could cause interference
and/or damage to LE-LAN devices.
Changes or modifications not expressly approved by the party responsible for compliance could
void the user's authority to operate the equipment.
Cet appareil numérique de classe B est conforme aux normes NMB-003 et CNR-247 en vigueur
au Canada.
Son fonctionnement est soumis aux deux conditions suivantes : (1) Cet appareil ne doit pas
créer d'interférences nuisibles. (2) Cet appareil doit tolérer toutes les interférences reçues, y
compris les interférences pouvant entraîner un fonctionnement indésirable. L'installateur du
présent matériel radio doit veiller à ce que le produit soit placé ou orienté de manière à n'émettre
aucun champ radioélectrique supérieur aux limites fixées pour le grand public par le ministère
fédéral Santé Canada ; consultez le Code de sécurité 6 sur le site Web de Santé Canada à
l'adresse : www.hc-sc.gc.ca/rpb. Comme indiqué auparavant, l'installateur ne peut pas contrôler
l'orientation de l'antenne. Il peut néanmoins placer le produit tout entier de manière à provoquer
le problème décrit ci-dessus.
Les dispositifs fonctionnant dans la bande 5150-5250 MHz sont réservés uniquement pour une
utilisation à l'intérieur afin de réduire les risques de brouillage préjudiciable aux systèmes de
satellites mobiles utilisant les mêmes canaux. Les utilisateurs de radars de haute puissance sont
désignés utilisateurs principaux (c.-à-d., qu'ils ont la priorité) pour les bandes 5250-5350 MHz et
5650-5850 MHz et que ces radars pourraient causer du brouillage et/ou des dommages aux
dispositifs LAN-EL.
Page 9 of 13
StreamUnlimited Engineering GmbH
Gutheil-Schoder-G. 10, 1100 Vienna, Austria
T +43-1-667 2002, F +43-1-667 2002 4401
ST1955 FCC IC Instruction For Use_V21_III
02 Aug. 21
4.
Antenna type and connections
Stream1955 provides two antenna ports via microwave coaxial connectors.
Antennas with 50 Ohm characteristic impedance must be connected to each microwave coaxial
connector via a coaxial RF cable.
No external amplifier or tuning circuitry must be used.
Stream1955 was certified for FCC and IC compliance using following antennas only:
Manufacturer and Part Number:
Molex 1461530XXX (recommended)
Type of antenna:
Frequency band:
Peak Gain:
Flex Balanced Dipole
2400 – 2500 MHz
5150 – 5850 MHz
3 dBi
4 dBi
Average Total Efficiency:
> 75%
> 75%
Cable Length :
100mm, 150mm, 200mm, 250mm, 300mm
Manufacturer and Part Number:
Type of antenna:
Frequency band:
Peak Gain:
Average Total Efficiency:
> 65%
> 68% > 50%
Cable Length :
100mm, 150mm, 200mm, 250mm, 300mm
2400 – 2500 MHz 5150 – 5850 MHz 5925 – 7125 MHz
2 dBi
3.3 dBi 4.5dBi
Molex 2042810XXX
Flex Balanced Dipole
Manufacturer and Part Number:
PulseLarsen Antennas W5098
Type of antenna:
Frequency band:
Peak Gain:
External Swivel dipole
2400 – 2500 MHz
5150 – 7125 MHz
3.5 dBi 3.8 dBi
Average Total Efficiency:
> 75%
> 71%
Manufacturer and Part Number:
Type of antenna:
Frequency band:
Peak Gain:
Cable Length:
2J-Antennas 2JMAS05c
Rigid Balanced Dipole
2400 – 2500 MHz
5100 – 5900 MHz
3 dBi
150mm
Page 10 of 13
StreamUnlimited Engineering GmbH
Gutheil-Schoder-G. 10, 1100 Vienna, Austria
T +43-1-667 2002, F +43-1-667 2002 4401
ST1955 FCC IC Instruction For Use_V21_III
02 Aug. 21
Manufacturer and Part Number:
Type of antenna:
Frequency band:
Peak Gain:
Tekfun F04A-SR-V2
External Swivel dipole
2400 – 2500 MHz
5150 – 7125 MHz
2.5 dBi 2.9dBi
Average Total Efficiency:
> 72% > 53%
Manufacturer and Part Number:
Type of antenna:
Frequency band:
Peak Gain:
Tekfun F50
External Swivel dipole
2400 – 2500 MHz
5150 – 7125 MHz
2.73 dBi 3.89dBi
Average Total Efficiency:
> 62% > 62%
Page 11 of 13
StreamUnlimited Engineering GmbH
Gutheil-Schoder-G. 10, 1100 Vienna, Austria
T +43-1-667 2002, F +43-1-667 2002 4401
ST1955 FCC IC Instruction For Use_V21_III
02 Aug. 21
4.1 Antenna’s valid configurations
Figure 1 Flex Balanced Dipole
Figure 2 External Swivel Dipole
Page 12 of 13
StreamUnlimited Engineering GmbH
Gutheil-Schoder-G. 10, 1100 Vienna, Austria
T +43-1-667 2002, F +43-1-667 2002 4401
ST1955 FCC IC Instruction For Use_V21_III
02 Aug. 21
5.
EMC application notes
Stream1955 is optimized for low radiation.
Consider following recommendations when designing application boards:
• Use a GND plane underneath the module.
• Use series resistors in all low-speed interface lines, values need to be chosen depending on
signal frequency and length of signal lines on application board.
• Use common mode signal filters in USB data lines, e.g. Wuerth 744232161.
• Prevent using vias in high-speed interface lines such as MIPI, USB and Ethernet
• Route high speed interface lines differentially and leave several mm gaps to other signal lines
• Make sure any interface which is not needed for your application is disabled in software.
when possible
Other application hints
• Decouple the module supply from functional blocks, which are sensitive to supply ripple. The
WLAN subsystem will draw up to 1200mA (Peak) while transmitting at high data rate but switch
to low power mode rapidly whenever idle. A large low-ESR capacitor (100uF) is recommended
to be placed close to the module with a ferrite bead or inductor towards sensitive circuitry such
as audio ADCs or DACs. Using 3x47µF ceramic capacitors in parallel will reduce disturbance
currents further.
• Use of an external 5V AC/DC adapter is not recommended, since current peaks of WLAN
subsystem would cause high voltage drops across the D.C. cable and connector which may
cause malfunction of USB ports. It is recommended to use a 12V AC/DC adapter and local 5V
DC/DC converter or internal SMPS.
Antennas considerations:
• When using adhesive antennas, they must not be mounted directly onto conductive material
such as metallic parts. Advised surface for best performance is plastic PC/ABS with a minimum
thickness of 1.5mm.
• Put antennas as far as possible from other radiating elements such as power supplies or
•
•
transmitters.
In case a large metal object (speakers, heatsink, printed circuit board...) inside the product
blocks the radiation from/to one antenna in one direction, the second antenna must be placed
at the other side of that object to cover 360° around the product.
Increasing distance between the antennas will improve WiFi/Bluetooth coexistence since
Bluetooth antenna may receive a signal while WiFi antenna is transmitting. An isolation of
25dB is recommended.
• Keep antenna cables as short as possible while meeting above requirements since longer
antenna cables will attenuate RF signals.
• Note that antennas and antenna cables carry RF energy which can influence analog circuitry
such as Audio input and output stages and infra-red receivers.
Page 13 of 13
StreamUnlimited Engineering GmbH
Gutheil-Schoder-G. 10, 1100 Vienna, Austria
T +43-1-667 2002, F +43-1-667 2002 4401