SOR4105T Harman Magic Box Users Manual

 

Version: 1.0 Last updated December 24, 2018 Design Requirements Document Copyright 2018 Sprint Corporation. All rights reserved. Copyright by Harman Connected Services, 2018-2019. All rights reserved worldwide. Legal Notices The information contained within this document is proprietary, privileged and intended only for the recipient. As such, the information is subject to all relevant copyright, patent and other laws protecting intellectual property, as well as any specific agreements protecting Harman Connected Services rights in the aforesaid information. Neither this document nor the information contained herein may be published, reproduced, transmitted or disclosed to third parties, in whole or in part, without the express, prior, written permission of Harman Connected Services In addition, any use of this document or the information contained herein for the purposes other than those for which it is disclosed is strictly forbidden. Harman Connected Services reserves the right, without prior notice or liability, to make changes in equipment design or specifications. Information supplied by Harman Connected Services is believed in good faith to be accurate and reliable, while every care has been taken in preparing these documents. However, Harman Connected Services does not make any representations and gives no warranties of whatever nature in respect of these documents, including without limitation, the accuracy or completeness of any information, facts and/or opinions contained therein. No responsibility is assumed by Harman Connected Services for the use of the documents nor for the rights of third parties which may be affected in any way by the use thereof. The provision of these documents (and the documents themselves) does not constitute professional advice of any kind. Any representation(s) in these documents concerning performance of Harman Connected Services product(s) are for informational purposes only and are not warranties of future performance, either expressed or implied. Harman Connected Services its affiliates, directors, employees and agents shall not be held liable for any damages or losses, of any nature whatsoever, arising from any use of and/or reliance on the documents. These documents may contain flaws, omissions or typesetting errors; no warranty is granted nor liability assumed in relation thereto unless specifically undertaken in Harman Connected Services sales contract or order confirmation. Information contained herein is periodically updated and changes will be incorporated into subsequent editions. If you have encountered an error, please notify Harman Connected Services Table of Contents 1. Document overview 1.1. Abstract 1.2. Security and proprietary information 2. 3. 4. Physical Design Hardware Specification Installation 4.1 Unpacking and Checking the unit 4.2 4.3 Finding the Best Location Initial Setup 5. Configuration 5.1 LTE Installation:

5.1.1 5.1.2 5.1.3 Installation Sequence Successful Installation Failed Installation 6. Sprint TREBL Companion App Flow:

6.1 Launch Screen :

6.2 On Boarding Flow 6.2.1 Welcome Screen :

6.2.2 6.2.3 6.2.4 Sound by Harman/Kardon:

Integrated with Alexa:

Know Your Device:

Terms and Conditions Screen:

6.3 6.4 Connection Flow Lets Connect:

Setup Mode On:

TREBL Connection:

6.4.1 6.4.2 6.4.3 6.5 AP Connection:

6.6 Device connection Status:

6.7 LTE Installation 6.7.1 6.7.2 LTE Installation progress Installation Failed :

6.8 Network Setting 6.9 Dashboard Mockup Screen:

6.10 DashBoard 6.11 Menu 6.11.1 Dashboard 6.11.2 MY TREBL 6.11.3 Network Setting 5 5 5 5 5 10 10 10 10 12 12 12 12 12 13 13 13 14 14 14 14 14 15 15 16 16 16 16 17 17 18 18 20 21 21 22 22 23 Page 3 6.11.4 Notification 6.11.5 Amazon Alexa 6.11.6 Help 6.11.7 About 7. Warning and Cautions 7.1 Human Exposure to Radio Frequencies 7.2 Radio Interference 7.3 Modifications 7.4 General 7.5 7.6 7.7 Important Safety Instructions Safety Service Information 7.8 UL Information 8. FCC Notice 8.1 8.2 Federal Communication Commission Notice Radiation Exposure Statement:

9. Maximum Output TX Total Power 10. Power Consumption 11. Customer Care Help Desk 12. Management 12.1 eSIM Card 13. Hardware Security 13.1 13.2 Factory Generation of Device Key eSIM 23 24 24 25 26 26 26 26 26 26 26 27 27 28 28 28 29 30 31 32 32 33 33 33 Page 4 1. Document overview 1.1. Abstract This purpose of this document is to define the overall Product requirements and design of Sprints MagixBox TREBL. This document is meant for Harman, Sercomm and Sprint Internal Teams to understand the Product implementation and requirements and execute them accordingly. 1.2. Security and proprietary information The content of this document is PROPRIETARY INFORMATION of Sprint, Harman and Sercomm . Permission must be granted by the originator before reproductions of this document can be made. If you need to dispose of this document, you should shred it. 2. Physical Design Physical dimensions are as follows:

o H X W X D = 205.99 mm X 199.87 mm X 199.87 mm o Weight: ~4.5 Kgs. 3. Hardware Specification The table below lists the MagicBox TREBLs hardware specifications as well as the supported 3GPP specifications. Table 3-1: Hardware Specifications Page 5 Category Specification Buttons Note: Buttons will be back lit and will laser-engraving underneath the top surface. have Button - 1: Amazon Action button,

- Long Press will take initiate Setup mode,

- Normal Press will initiate Alexa listening mode, when Alexa is configured and MagicBox is connected to internet,

- Normal press will announce Magic Box is not connected to internet, Use companion app to configure MagicBox, when MagicBox is not connected to internet Button - 2: Microphone mute Button - 3: Volume up Button - 4: Volume down, Long Press will mute speaker Button 5: Bluetooth button, Long Press will initiate Bluetooth pairing Hard Reset: Pin hole reset, trigger factory reset for all modules including audio and LTE. Sercomm to provide API to Artik board on press of reset. of 5 lights:

Used for visual Femto Wi-Fi notification Power Cell UE/Relay backhaul strip LED Voice Assistant Input Power Adapter: 110V-AC Magic Box+: 12V - 7A DC Power Adapter is labeled Power Adapter to have LED indication for power status. Cord 10 feet long Black color No Sprint branding on cord Power Supply cord from HK MB connector to power supply is between 3 and 5 feet Operating:

-5 Degree C to +40 Degree C of operation Ambient Storage should be -10 to +45 Degree C Temperature Range:

Resistant from External Ice Formation, Ingress of Dust and Ingress of Water:

IP 54 rated Weight of Box: 3 KG (approx) Volume: 8.24 Liters (approx.) Magic Box will contain 15 antenna serving various purpose, details are mentioned in Antenna Specifications Bluetooth 4.2 (BLE + Classic) Page 6 LED Power Environment Dimensions Antenna Bluetooth Zigbee SIM card MAC Address Serial Number System of No Type:

Material:

Frequency range: 2400 - 2500 MHz ZigBee (802.15.4) Lab:

Antenna:

1 Dipole PCB LAB/NRT devices will have 3FF removable UICC slots to use lab specific UICCs Production: MFF2 SIM (soldered) for production rule: C+XX(Product Single MAC address for the complete board SN Month)+nnnnn Product Ex: C88180612345 MB GPS will process AGPS data from Sprint provided file server MagicBox:

digits for ID

(5 ID) +YYMM(2 digits Year+2 digits number) incremental hex C88 Device will do Plug and Play and receive new configuration at every Power Cycle, including the case where a device moves between power cycles Device has a System Watchdog Timer Software + Hard ware Disabled unused access ports FCC Approved LTE Femto Specification The following table lists the LTE Femto specifications:

Category Specification Chipset Info FSM9016 + FTR8930 + DDR3L1GB + AR8033 Transmit Power 2x 21dBm Max Indoor LTE Sector Tx Power Gain Antenna

(Femto) Tx Range Band 41 Indoor Antenna Gain: > 5dBi eNB Tx Dynamic Range: > 26dB Tx Emissions eNB Spurious Emissions: meet Category B as defined in 3GPP TS36.104 Rx Sensitivity eNB Rx Sensitivity: meets Local Area as per TS36.104 Rx Selectivity eNB Adjacent Channel Selectivity (ACL): as per TS36.104 Frequency Accuracy

+/-0.1ppm eNB Frequency Accuracy UE category Support for UE Category up to 4 Bandwidth Bandwidth support Single channel, B41, 10/15/20MHz Transmission Mode Transmission Mode 3, 4 Page 7 TDD Frame Configuration 1 (DL: UL 60:40) Frame Type TDD Frame Configuration 2 (DL: UL 80:20) Special Sub-Frame 7 Error Control HARQ Channel quality Enhanced Link Adaptation S1 Seamless Handover Handover X2 Seamless Handover Lossless Handover (Packet Forwarding) RLC Mode Sync LTE security RLC-AM RLC-UM RLC-TM Sync from GPS Sync from Network Listen AES Integrity Protection SNOW3G Integrity Protection IPSEC CMPv2 Soft Frequency Reuse (SFR) / Static ICIC Network LTE Planning PLMN Support (up to six) Handover Restriction List (HRL) of Quality Service Public Warning System Multi Frequency Band Indicator (MFBI) DSCP Marking Public Warning System (PWS) Support S1 Reset S1-AP Procedure Location Reporting Internet Protocol

(IP) addresses Legacy network support S1-Flex IPv6 CSFB to 1x (R8) VoLTE: RoHC VoLTE: Signaling Prioritization VoLTE VoLTE: Emergency Call Support & eCID VoLTE: Short PDCP VoLTE: 16 VoLTE users Access Class Barring NS Signaling NS-01 NS Signaling NS-04 A1 Events A2 Events A3 Events A4 Events A5 Events Congestion control NS Signaling Event Type Page 8 Internet Protocol

(IP) support IPv4 Support IPv6 Support Max UEs 16 active UEs Antenna Gain WiFi Antenna Gain: >2dBi GPS Antenna Gain: >2dBi Receiver GPS GPS Receiver as per spec X2 AP procedure Load information over X2 Congestion control Load based scheduling LTE Relay Specification The following table lists the LTE relay specifications:

Category SIM Card Specifications Standard SIM Card (3FF) for Lab and MFF2 for production Chipset Info GDM7243A + GRF7243A + QCA8337 Band support:

B41 Low (2500MHz-2600MHz) TDD: 41 FDD: 25 TX Power Antenna Gain (UE) Modulation CA MIMO Bandwidth UE category 3GPP Release Disabled Interfaces JTAG Secure Bootable B41 High (2620MHz-2690MHz) B25 (UL:1850Mhz-1915Mhz; DL:1930Mhz-1995Mhz) B41:23dBm B25:20dBm B41: 4dBi B25: 6dBi UL: QPSK, 16QAM, 64QAM DL: QPSK, 16QAM, 64QAM, 256QAM 2CA, B25 any combination, noncontiguous 2CA, B41 Low any combination, Contiguous/noncontiguous 2CA, B41 High any combination, Contiguous/noncontiguous 3CA, B25 any combination, noncontiguous 3CA, B41 Low any combination, Contiguous/noncontiguous 3CA, B41 High any combination, Contiguous/noncontiguous 4CA, B41 Low 4CA, B41 High 4x2 DL MIMO 4x4 DL MIMO (single carrier support only) 4x8 DL MIMO SISO UL 2/4 TX CDD (UL) 5/10/15/20Mhz 12 R12 Yes Yes Page 9 IPv6 Support Peak Throughput UE Yes DL DL=B41/580 Mbit/s , 4CA 256QAM B25/600 Mbit/s (3CA 256QAM) Transmission DL Mode DL Transmission Mode 1 -9 Frame Type 1 FDD Frame Type 2 TDD, 5ms periodicity B41: 4T8R B25: 2T8R DeNB Selection and Ranking PDCL --> Donor Selection Algorithm Frame Type Tx/Rx Scanning 4. Installation The Sprint TREBL unit is placed on the windowsill to receive the signal from outdoors and boost it indoors. The following steps instruct on the proper positioning and setup of the Sprint Magic Box unit for optimal service. 4.1 Unpacking and Checking the unit Carefully unpack the Sprint TREBL unit from the box. Remove the Power Supply (included) from the packaging. Inspect the unit for any damage and check that all the accessories are in the box. 4.2 Finding the Best Location Choose an appropriate window at the suitable side of a building is vital to get the best performance The Sprint TREBL has a built-in capability to survey the 4G signal from suitable provider cell towers & also use GPS to accurately determine its location. It can do this for multiple windows in the same or on multiple floors, ideally in all four directions of the building. Connect the power supply to the underside of the AU 587 and place it at the 1st window

(ideally in the middle of the window). Wait for the RF survey to complete Go to the next window and repeat the survey process Test as many windows as possible in all four directions as possible Once you finish testing all locations, select the best location out of all surveyed locations and press Install Here in the location 4.3 Initial Setup Page 10 The Sprint TREBL turns on automatically when the power supply unit is connected to the underside of the unit. 1. Place the Sprint TREBL on a suitable windowsill and verify that the units rear side is positioned against the glass as close to the glass as possible (as in the figure 1 below). 2. Shortly the following will be occurred while the unit is starting up. VGI Sound: Your Sprint TREBL is getting Activated LED Pattern: Sprint TREBL LED shows 'Pulsing white light' pattern Page 11 5. Configuration After solid white LED pattern Sprint TREBL is looking for sprint network after find the Sprint network following process start 5.1 LTE Installation:

5.1.1 Installation Sequence VGI Sound: Sprint TREBL Installation is in progress. Please install the companion app on your mobile or tablet LED Pattern: Solid blue light getting covered up by solid white light with increasing progress 5.1.2 Successful Installation VGI Sound: Sprint TREBL setup is complete, to configure Alexa please use the Companion App LED Pattern: Sprint TREBL LED shows 'Solid White light'

5.1.3 Failed Installation VGI Sound: Seems there is an error. Please refer the companion app for error code and troubleshooting LED Pattern: Red light blinking twice and then solid red color If LTE installation is failed user can download the Sprint TREBL companion App from the App store and able to configure Wi-Fi Page 12 6. Sprint TREBL Companion App Flow:

6.1 Launch Screen :

Launch screen shows Sprint TREBL Logo while launching the APP. It is the first screen after launch APP and it appears for 2-3 second to user 6.2 On Boarding Flow In On Boarding flow user navigate from below mentioned four screens Page 13 6.2.1 Welcome Screen :

Welcome screen appears after launch screen that provide a message to user Sprint TREBL help to boost your network and improve the connectivity experience. 6.2.2 Sound by Harman/Kardon:

After tap on next button in welcome screen or swipe left Sound by Harman/Kardon screen Appears which provide the message to user that Harman Kardon Speaker Integrated in Sprint TREBL and user can enjoy the music after connected from the bluetooth. 6.2.3 Integrated with Alexa:

After tap on next button in Sound by Harman/Kardon screen or swipe left Integrated with Alexa screen Appears which provide the message to user that user can configure Alexa in Sprint TREBL using this companion App. 6.2.4 Know Your Device:

After tap on next button in Integrated with Alexa screen or swipe left Know Your Device screen Appears which provide the information of following device buttons to user Volume Down Mute Micophone Alexa Bluetooth Pairing Volume up 6.3 Terms and Conditions Screen:

After tap on Get Started Button on Know your device Screen Terms and Conditions Screen Appears to user which shows all terms and conditions of using companion App Page 14 6.4 Connection Flow After accepting Terms and condition user enter on the connection flow to connect Sprint TREBL to companion App Connection Flow to Connect Sprint TREBL Connection flow user navigate from three screen 6.4.1 Lets Connect:

This Screen provide the message to user how to enable setup mode by long press Alexa button in Sprint TREBL Page 15 6.4.2 Setup Mode On:

After tap on continue button user navigate to Setup Mode on Screen which provide a message to user how to identify that the setup mode is enable or not by checking to and fro motion of blue light. 6.4.3 TREBL Connection:

After tap on continue button of Setup Mode On Screen user navigate to TREBL Connection Screen which provide the SSID (HK TREBL-XXX) information of Sprint TREBL to user so user can identify Sprint TREBL in Wi-Fi List. 6.5 AP Connection:

After connection flow user needs to connect Sprint TREBL Wi-Fi from the Wi-Fi list and navigate back in App 6.6 Device connection Status:

After connecting Sprint TREBL AP mode while user navigate back to App Device connection status screens provides connection status (connected / Failure) 1. Successfully Connected 2 . Connection Failure Page 16 6.7 LTE Installation 6.7.1 LTE Installation progress After tap on Continue button in device connected screen. App check first the LTE installation status if it is less than 100 so user navigate to installation screen that show the progress for LTE Insatallion in Sprint TREBL Page 17 Installation in progress Installation Complete 6.7.2 Installation Failed :

if any issue occurred during installation user navigate to installation failed Screen. 6.8 Network Setting After installation Failed user have option to configure Wi-Fi and when user tap on switch to Wi-Fi option in Installation failed screen user navigate to network setting screen Page 18 When user select any Wi-Fi . user need to enter password if the Wi-Fi is protected, for open Wi-Fi it configure directly and after successful Wi-Fi configurartion. user navigate to Alexa entry screen which is option to user configure Alexa . Page 19 6.9 Dashboard Mockup Screen:

If user dont want alexa configuration now after tapping back button its re direct to Dashboard Mock up Screen Page 20 Mockup screen provide the information of for following Dashboard button functions . Side menu Notifiaction Change Login 6.10 DashBoard When user tap on got it button on Mock screen Dashboard appears. Which provide the following status of Sprint TREBL TREBL Connection Status Network Setting option Amazon Alexa 6.11 Menu When user tap on hamburger icon it show s menu with following options Dashboard My TREBL Network Settings Notification Amazon Alexa Page 21 Help About 6.11.1 Dashboard When user tap on Dashboard it re- direct to Dashboard screen. this option is selected by Default 6.11.2 MY TREBL When user tap on My TREBL option it navigates to MY TREBL screen which contains following information of configured sprint TREBL Serial Number Model Device Name TREBL firmware version Speaker firmware version Page 22 6.11.3 Network Setting When user tap on Network setting it re direct to Network Setting screen 6.11.4 Notification When user tap on Notification screen it showing all notification recover from the sprint TREBL device Page 23 6.11.5 Amazon Alexa When user tap in Amazon Alexa option it redirects to Alexa entry screen. if Alexa is already configured it shows Alexa logout popup. 6.11.6 Help When user tap on help button it re direct to help screen with following options Troubleshoot / Error code FAQ TREBL Tech Support All other Question Which provide option to user for call to Customer care for related queries and help Page 24 6.11.7 About When user tap on About it shows the current version of APP and build number. Page 25 7. Warning and Cautions 7.1 Human Exposure to Radio Frequencies The Sprint TREBL antennas should be installed with a minimum distance of 20 CM from your body. 7.2 Radio Interference 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 internal vehicle radio communications. Please ensure a maximum separation between the Sprint TREBL antenna and other antennas. 7.3 Modifications Any changes and modifications to this device that are not expressly approved by Sprint Networks may void the user's authority to operate the equipment. 7.4 General Only qualified personnel should be allowed to install, replace, and service the equipment. The device cannot be sold retail, to the general public or by mail order. It must be sold to operators. Installation must be controlled. Installation must be performed by licensed professionals. Installation requires special training. The Sprint TREBL unit should be installed ONLY by those who are familiar with local building and safety codes and, wherever applicable, are licensed by the appropriate government regulatory authorities. Failure to do so may void Sprint product warranty and may expose the end user or the service provider to legal and financial liabilities. Sprint and its resellers or distributors are not liable for injury, damage or violation of regulations associated with the installation of outdoor units or antennas. The Sprint TREBL unit does not provide protection from hazard energy in case of single fault condition. Power supply shall be limited up to 4A in normal and single fault condition. 7.5 Important Safety Instructions Read and Save these instructions This Installation Guide contains instructions and warnings that should be followed during installation, and operation. Failure to follow these instructions could cause bodily injury and/or product failure 7.6 Safety o Read this guide and follow all operating and safety instructions. o Supply cord is not shipped with the unit and is to be provided by user. Installation is to be performed by a qualified electrician according to local codes. Installation to be done in accordance with the National Electrical Code (NEC), ANSI/NFPA 70, the Canadian Electrical Code (CEC), Part I, CAN/CSA C22.1, and when applicable, the National Electrical Safety Code, IEEE C2. o Sprint TREBL User Guide o DUG01476-SP Sprint Commercial and Internal Use 17 Page 26 o Static sensitive components inside - do not remove the lid or base: No user serviceable parts inside. o Position the power cord to avoid possible damage; do not overload circuits. o Do not place this product on or near a direct heat source and avoid placing objects on the terminal. o Use only a damp cloth for cleaning. Do not use liquid or aerosol cleaners. Disconnect the power before cleaning. o o It is the users responsibility to install this device in accordance with the local electrical codes. Installation of the Sprint TREBL unit should be performed by someone familiar with the product. o The circuit breaker where connected should be easily accessible in case you have to disconnect the device. o When installed in the final configuration, the product must comply with the applicable Safety Standards and regulatory requirements of the country in which it is installed. If necessary, consult with the appropriate regulatory agencies and inspection authorities to ensure compliance. 7.7 Service Information Refer all repairs to qualified service personnel. Do not modify any part of this device, as this will void the warranty. Disconnect the power to this product and return it for service if the following conditions apply:

a. The unit does not function after following the operating instructions outlined in this manual. b. The product has been dropped or the housing is damaged. Locate the serial number of the terminal and record this on your registration card for future reference. Also record the MAC address, located on the product sticker. 7.8 UL Information

- The circuit where the equipment is connected must be properly grounded according with NEC and other local safety code requirements.

- Reminder to all the BWA system installers: Attention to Section 820-40 of the NEC which provides guidelines for proper grounding and, in particular, specifies that the cable ground shall be connected to the grounding system of the building, as close to the point of cable entry as is practical. Page 27 8. FCC Notice 8.1 Federal Communication Commission Notice 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 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 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 is Increase the separation between the equipment and receiver. connected. Consult the dealer or an experienced radio/TV technician for help. FCC Caution: Any changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate this equipment. This transmitter must not be co-located or operating in conjunction with any other antenna or transmitter. Operations in the 5.15-5.25GHz band are restricted to indoor usage only. 8.2 Radiation Exposure Statement:

This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance 20cm between the radiator &

your body. Note: The country code selection is for non-US model only and is not available to all US model. Per FCC regulation, all Wi-Fi product marketed in US must fixed to US operation channels only. Page 28 9. Maximum Output TX Total Power Table 1: Sprint Magic Box Gold eNB FCC Maximum Output TX Total Power Caution: Do not set maximum output TX power to higher than local regulations. Page 29 10. Power Consumption Antenna Usage Sprint Magic Box Gold unit has four (4) RF ports that are connected to two (2) dual-port antennas arrays. Each antenna array is mounted on opposite sides internally within the Airspan product housing. This is so that one antenna array faces forwards and one antenna array faces outwards for optimized coverage. Page 30 11. Customer Care Help Desk Sprint Customer Care Help Desk offers prompt and efficient customer support services. To create and update issue logs, send e-mails to Customer Care Help Desk. Once you submit your issue, the system generates a new issue and sends an issue number for your reference. The system uses this issue number to categorize and store e-mails under the appropriate issue. To help Customer Care Help Desk identify your issue, include the issue number and your Customer Care Helpdesk account details in all further communications. Worldwide Headquarters Sprint Headquarters 6200 Sprint Pkwy. Overland Park, KS 66251 Page 31 12. Management Software is upgraded locally and remotely. Designed for local and remote management 11. Sprint TREBL 11.1 Physical Dimensions H X W X D = 205.99 mm X 199.87 mm X 199.87 mm Weight: ~4.5 Kgs. 12.1 eSIM Card The Sprint TREBL provides an embedded eSIM and a standard SIM card holder for the operator-

provided SIM, (installed during assembly). 11.4 Power Supply The Sprint TREBL is powered via an AC main (line power) adapter which provides local DC power to the unit:

Input o Power Adapter: 110V-AC o 12V - 5A DC Cord o 10 feet long o Black color Page 32 13. Hardware Security 13.1 Factory Generation of Device Key Each device has a private key and associated certificate which is used to authenticate itself when initiating communications. This private key is generated in the factory, and so is the corresponding vendor certificate. This capability necessary in order to support large scale plug and play deployments. This device key is stored on the Sprint TREBL to allow it to authenticate to the network. If the private key is compromised, then the device can be masqueraded by an attacker towards the operators core network. Therefore, it is stored in an encrypted form. In later releases a device-specific key will be introduced, this is a random number blown into on-SoC eFuses during manufacture. This offers two points of additional protection namely: the key is not discoverable by decompiling the code (an attacker will need to run code on the device in order to read the eFuses); and the key can only be used to obtain the private key of a single device (because each encryption key is unique). 13.2 eSIM The system provides an embedded SIM (eSIM) to the board instead of using a removable SIM; this removes the temptation to steal the SIM. Additionally, the operator can ensure that these SIMs can only be used with the Relay APN, which would make them unusable with an ordinary mobile phone

(because relay traffic uses nested GTP-U tunnels). Page 33