StreamUnlimited ST1955 Network Audio Streaming Module Instructions

: June 6, 2024
: StreamUnlimited

Table of Contents

Document History
Granted certificates
**Conditions for re-use of modular certification
Antenna type and connections
**EMC application notes
Read User Manual Online (PDF format)
Download This Manual (PDF format)

Instruction for FCC/IC compliant use
Stream1955
Network Audio Streaming Module

Version: 2.1
Authors: C. Apel/C.Arnaud
Reviewer:
Date: 02 Aug. 21

StreamUnlimited Engineering GmbH
Gutheil-Schoder-G. 10, 1100 Vienna, Austria
T +43-1-667 2002, F +43-1-667 2002 4401

Document History

No.| Primary Author(s)| Description of Version| Date Completed
---|---|---|---
1.0| C. Apel| Initial version| 2019-11-14
1.1| C. Apel| Update conditions for referring to modular certification| 2020-01-10
2.0| C. Arnardi| Initial version AP6275S| 2021-05-14
2.1| C. Apel| Changed FCC/IC IDs for AP6275S, updated antenna list| 2021-06-14
2.2| C.Arnardi| 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 owner’s 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.

Granted certificates

FCC
47 CFR Part 15

FCC Part 15.247| DTS WIFI 2.4 GHz 802.11 b/g/n/ax
FCC Part 15.407| UNII WIFI 5GHz 802.11 a/n/ac/ax
FCC Part 15.247| DSS Bluetooth 4.2/ BLE
IC|
---|---
RSS-247| 802.11 a/c/g/n/ac/ax
Bluetooth 4.2 / Bluetooth Low-energy
ETSI

EN 301 893 V2.1.1| WIFI 5 GHz 802.11 a/n/ac/ax
EN 300 440 V2.1.1
EN 300 328 V2.2.2| 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 with 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.

**Conditions for re-use of modular certification

**

To make use of modular certification, the 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.

ONLY antennas listed under section 4 are used.
Equivalent antennas of the 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 a 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, the 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 the “NVRAM file” must remain unchanged.
Regulatory domain is set to worldwide 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 labeling 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:

The integrator should check for emissions that may occur due to the intermixing of emissions with the other transmitters, digital circuitry, or 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 they do not have any responsibility for final product compliance.

Additional Testing, Part 15 Subpart B Disclaimer :
The module is only FCC authorized for the specific rule parts listed on the grant, and 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%20WiFi%20SAR%20v02r02&tracking_number=28238

Ad 6): StreamUnlimited provides NVRAM files for “CE” and for “FCC” configurations. The region is selected during end-product configuration prior to product encasing. In the same step, also the country in which the product is intended 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 a 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 the software of StreamUnlimited, a similar approach must be taken to prevent tampering with the system either via direct access or by modification of the updated software image.

Product labeling 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 the following text:
“contains FCC ID: 2AJYB-ST1955”
“contains IC: 20504-ST1955”

See the below example for reference

contains FCC ID: 2AJYB-ST1955
contains IC: 20604-ST1955
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.

Instruction for use requirements

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 USA :
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 the warranty and all applicable regulatory certifications and approvals, including the 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.

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.
Increase the separation between the equipment and receiver.
Connect the equipment into an outlet on a circuit different from that to which the 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 is 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.

Canada:
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 Web 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 advised 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.

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 the following antennas only:

Manufacturer and Pan Number:

| Molex 14431530XXX (recommended)
---|---
Type of antenna:| Flex Balanced Dipole
Frequency band:| 2400 – 2500 MHz 5150 – 5850 MHz
Peak Gain:| 3 dBi 4 dBi
Average Total Efficiency:| > 75% > 75%
Cable Length :| 100mm, 150mm, 200mm, 250mm, 300mm
|
Manufacturer and Pan Number:| Molex 2042810XXX
Type of antenna:| Flex Balanced Dipole
Frequency band:| 2400 – 2500 MHz 5150 – 6850 MHz 5925 – 7125 MHz
Peak Gain:| 2 dBi 3.3 OBI 4.SOBI
Average Total Efficiency:| > 65%

68% > 50%
Cable Length :| 100mm, 150mm, 200mm, 250mm, 300mm
|
Manufacturer and Pan Number:| PulseLarsen Antennas W5098
Type of antenna:| External Swivel dipole
Frequency band:| 2400 – 2500 MHz 5150 – 7125 MHz
Peak Gain:| 3.5 dBi 3.8 dBi
Average Total Efficiency:| > 75% 71%
|
Manufacturer and Pan Number.| 2.1-Antennas 2JMASO5c
Type of antenna:| Rigid Balanced Dipole
Frequency band:| 2400 – 2500 MHz 5100 – 5900 MHz
Peak Gain:| 3 dBi
Cable Length:| 150mm
| |
---|---|---

Manufacturer and Part Number:

|

Tekin FO4A-SR-V2

Manufacturer and Part Number:

|

Tekin F50

4.1 Antenna’s valid configurations

Figure 1 Flex Balanced Dipole

Figure 2 External Swivel Dipole

**EMC application notes

**

Stream1955 is optimized for low radiation. Consider the 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 the 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 when possible
Make sure any interface which is not needed for your application is disabled in software.

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 a 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 3×47µF ceramic capacitors in parallel will reduce disturbance currents further.
Use of an external 5V AC/DC adapter is not recommended, since current peaks of the 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 the distance between the antennas will improve WiFi/Bluetooth coexistence since the Bluetooth antenna may receive a signal while the WiFi antenna is transmitting. Isolation of 25dB is recommended.
Keep antenna cables as short as possible while meeting the 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.