Alto BTT-400 User manual

Alto
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Alto
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BTT-400
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PRODUCT MANUAL
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107840 Bluetooth Audio Interface
Product Manual
Alto Aviation
86 Leominster Rd
PO Box 399
Sterling, MA 01564
Phone: 978.466.5992
800.814.0123
Fax: 978.466.5996
E-mail: tech@altoaviation.com
www.altoaviation.com
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Revisions
Rev #
ECN
Date
Description
1
NDI
04/03/19
Initial
2
E1904007
04/09/19
Added Section 4.8 Functional Hazard Assessment (FHA)
3
E1904009
04/11/19
Added BT Radio Note in Section 4.1
Copyright/Proprietary Notice
Alto products are continually improved and all specifications are subject to change without notice. Information
and data in this document is confidential and proprietary. Reproduction or disclosure of the information contained
in this publication or any portion thereof, by any means, without the express written permission of
Alto Technologies Corporation is prohibited.
Copyright © Alto Technologies Corporation. All rights reserved
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Service Bulletin List
Service
Bulletin
Number
Subject
Manual
Revision
Number
Manual
Revision
Date
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Table of Contents
1.0 General ............................................................................................................................................6
1.1 Equipment Description ..................................................................................................................................... 6
1.2 Definitions and Acronyms ................................................................................................................................ 7
1.3 107840 Series Overview .................................................................................................................................. 7
2.0 Components ....................................................................................................................................8
2.1 Pairing Switch and LED ................................................................................................................................... 9
2.2 Headphone Out / Auxiliary Input .................................................................................................................... 10
2.3 Audio In / Out ................................................................................................................................................. 11
2.4 Outline Drawings ........................................................................................................................................... 12
2.5 Qualification Data .......................................................................................................................................... 14
3.0 Operation ...................................................................................................................................... 15
3.1 Bluetooth Receiver (Audio Input) Operation .................................................................................................. 15
3.2 Bluetooth Audio Transmitter Operation .......................................................................................................... 16
3.3 Notes on Latency ........................................................................................................................................... 16
4.0 Installation .................................................................................................................................... 17
4.1 BT Radio Emission Installation Note .............................................................................................................. 17
4.2 General .......................................................................................................................................................... 17
4.3 Unpacking and Inspection ............................................................................................................................. 18
4.4 Mounting Considerations ............................................................................................................................... 18
4.5 Electrical Load Analysis ................................................................................................................................. 19
4.6 Bonding ......................................................................................................................................................... 19
4.7 Wire Shielding ............................................................................................................................................... 19
4.8 FCC Regulations ........................................................................................................................................... 19
4.9 Functional Hazard Assessment (FHA) ........................................................................................................... 20
5.0 Technical Specifications ............................................................................................................. 21
6.0 Connector Specifications ........................................................................................................... 23
7.0 DO-160G Qualification ................................................................................................................ 24
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Table of Figures
Figure 1: 107840-XXXX-XXXXX Bluetooth Audio Interface ................................................................... 6
Figure 2: Block Diagram of Bluetooth Audio Interface ............................................................................ 8
Figure 3: Pairing Switch and Indicator .................................................................................................... 9
Figure 4: Bluetooth Transmitter Connection Options (Do not connect both simultaneously) ................ 10
Figure 5: Bluetooth Receiver Connection Options (Do not connect both simultaneously) .................... 10
Figure 6: Bluetooth Transmitter Audio Input Example .......................................................................... 11
Figure 7: Bluetooth Receiver Audio Output Example ........................................................................... 11
Figure 8: Top View, Bottom View, and Left View with Dimensions ....................................................... 12
Figure 9: Left End Plate- J1 Connector ................................................................................................ 13
Figure 10: Avoid mounting the Bluetooth Audio Interface behind metal skinned or mesh honeycomb
panels .......................................................................................................................................... 18
Table of Tables
Table 1: Bluetooth Audio Interface Models ............................................................................................ 6
Table 2: DO-160G Qualification Form – Environmental ...................................................................... 24
Table 3: DO-160G Qualification Form – EMI ....................................................................................... 25
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1.0 GENERAL
This manual contains information about the installation and operation of the ALTO 107840 Bluetooth
Audio Interface. Product information regarding mounting, mechanical, and electrical characteristics is
also detailed.
Figure 1: 107840-XXXX-XXXXX Bluetooth Audio Interface
1.1 Equipment Description
The Bluetooth Audio Interface is an independent module that receives or transmits entertainment audio.
The unit can be operated via the button mounted on top, or paired with an external switch and LED for
remote installation.
Models
Part Number
Description
BTR-300
107840-0300-00010
Bluetooth Audio Interface Receiver
BTT-400
107840-0400-00010
Bluetooth Audio Interface Transmitter
Table 1: Bluetooth Audio Interface Models
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1.2 Definitions and Acronyms
CMS
Cabin Management System
PA
Public Address
BT
Bluetooth
A/V
Audio/Video
BT Sink
The device receives BT audio via RF and outputs analog audio
via wire to an amplifier
BT Source
The device transmits BT audio via RF to a receiver such as BT
Headphones. Analog audio is received via wire from an audio
source
A2DP
Advanced Audio Distribution Profile (A2DP). Enables stereo
audio streaming for the music player (source) to headphones
or speakers (sink)
SBC
Low complexity Sub-band Coding. Provides good audio quality
at medium bit rates while keeping low computational
complexity
AptX
A higher quality alternative to SBC codec used in A2DP.
Adopted to many Android platforms but not Apple OSX devices
AptX-LL
An AptX codec with low latency, around 40mS vs the normal
delay of around 150mS.
LL
Low-Latency
1.3 107840 Series Overview
The 107840 Bluetooth Audio Interface is a small module designed to provide a Bluetooth Audio link to
an aircraft audio system. The unit is available in two configurations:
Bluetooth Audio Receiver (Sink): The device receives a Bluetooth audio stream from a
Bluetooth audio source (i.e. a smartphone or tablet). The audio is decoded and output over an analog
wired connection to an audio amplifier.
Bluetooth Audio Transmitter (Source): The device is used as the source of Bluetooth audio. The
unit receives audio from an analog wired connection, encodes and then streams the audio via A2DP to
a receiver such as wireless Bluetooth headphones.
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2.0 COMPONENTS
Figure 2: Block Diagram of Bluetooth Audio Interface
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2.1 Pairing Switch and LED
The Pairing Switch and LED (pin 3 and 4) are located on the top of the Bluetooth Audio Interface. The
LED is blue and indicates current pairing status. If the BT Audio Interface is to be installed remotely,
there are two pins on the connector which can be wired to an external pairing switch and LED. For
more details on LED status and switch functionality, reference Section 3.1.
The pairing switch pin input accepts a momentary ground input and the LED output pin provides a
ground output when active.
Figure 3: Pairing Switch and Indicator
Pairing Indicator
Pairing Switch
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2.2 Headphone Out / Auxiliary Input
The Bluetooth Transmitter includes headphone audio output lines (pins 5, 7, and 8), in the event that
the user does not have Bluetooth capable headphones. In this case, the traditional wired headphones
can be connected to a female 3.5mm jack (sold separately) installed adjacent to the pairing switch and
indicator. Wired headphones should not be used while the Transmitter is paired with a device.
The Bluetooth Receiver includes auxiliary audio input lines (pins 5, 7, and 8), in the event that the user
does not have a Bluetooth capable audio streaming device. In this case, the user can connect the
wired, analog audio output from their media device to an auxiliary 3.5mm audio input jack (sold
separately) installed adjacent to the pairing switch and indicator. Any Bluetooth connections should be
un-paired before connecting a wired, analog audio source to the auxiliary input lines otherwise audio
will be mixed from the aux input and the Bluetooth audio stream.
Wired Connection
(pins 5, 7, 8)
Wired Connection
(pins 5, 7, 8)
Wireless Bluetooth Audio Stream
Wireless Bluetooth Audio Stream
Figure 4: Bluetooth Transmitter Connection Options (Do not connect both simultaneously)
Figure 5: Bluetooth Receiver Connection Options (Do not connect both simultaneously)
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2.3 Audio In / Out
The Bluetooth Transmitter includes a differential audio input (pins 10, 12, 14, 15). This audio input will
be connected to a line level audio output, such as a CMS or Blu-Ray player audio output.
The Bluetooth Receiver includes a differential audio output (pins 10, 12, 14, 15). This audio output
provides line level signal to an amplifier which drives speakers.
Wireless Bluetooth
Audio Stream
Wired
Connection
(pins 10, 12,
14, 15)
Wired
Connection
(pins 10, 12,
14, 15)
Wireless Bluetooth
Audio Stream
Figure 6: Bluetooth Transmitter Audio Input Example
Figure 7: Bluetooth Receiver Audio Output Example
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2.4 Outline Drawings
Figure 8: Top View, Bottom View, and Left View with Dimensions
Dot indicates location of
Center of Gravity.
Tolerance +-10mm
Unit weight: < 0.25 lbs /
113 g
A Weight and Balance
calculation aircraft is required
as part of installation approval
process.
Note: Dimensions are for
reference only. See DA
(Delivered Assembly) drawing
for exact dimensions.
43mm
34mm
10mm
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Figure 9: Left End Plate- J1 Connector
J1 Connector- Control and Status
9 Pin Female DSUB
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2.5 Qualification Data
The Bluetooth Audio Interface is certified to DO-160G categories listed in Section 7.0.
The product is qualified to the applicable sections of TSO-C139a and RTCA/DO-214a.
The conditions and tests for TSO approval of this article are minimum performance standards. Those
installing this article, on or in a specific type or class of aircraft, must determine that the aircraft
installation conditions are within the TSO standards. The article may be installed only following 14 CFR
part 43 or the applicable airworthiness requirements.
The equipment contains a Bluetooth radio that transmits at frequencies from 2402 to 2480 MHz. The
installer must verify that this Bluetooth radio installation does not adversely affect simultaneous
operation of required aircraft radio receivers.
For specific qualification testing documentation, please contact ALTO.
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3.0 OPERATION
3.1 Bluetooth Receiver (Audio Input) Operation
When the device is configured as audio input, the Bluetooth module implements an A2DP sink profile
with SBC protocol. A2DP enables stereo audio streaming from the music player to the ALTO audio
system.
1. Upon power up, the unit is initially not connected to any devices and the unit name is broadcast.
Check the software label located on the bottom of the unit for the SSID broadcast name. When
a device is paired with the Bluetooth Interface, the broadcast name changes and is appended
with [X], allowing other users to know that the device is taken. The [X] indicator is removed
when the device is available once again. The Bluetooth interface name is always broadcast
whether something is connected or not.
2. Upon power up, the unit will continuously try to connect to any of the previously connected
devices in its internal pairing list. If it finds one, then it re-pairs (first come first serve). If a
connected device is disconnected, then the pairing sequence continues by trying to connect to
the next device on the pairing list.
3. If the button is pressed short (duration less than 2 seconds), all devices are kicked off, the auto-
connect is disabled, and the light blinks fast waiting for someone to manually connect. It will stay
in this fast-blink mode awaiting a connection for 60 seconds after which it will return to auto-
connect (light off.)
4. If the button is pressed long (duration greater than 2 seconds), all devices are kicked off and
the previously connected device information on the internal pairing list is deleted. The LED will
blink fast indicating the device is awaiting a manual connection.
NOTE: If an Apple device is paired and the pairings get cleared via long press, the Apple device
still retains this pairing connection in a list. Further attempts to pair will result in an error. You
must select “FORGET DEVICE” on the Apple device first, and then you will be able to re-pair.
3.1.1 BT Receiver (Audio Input): LED Status Quick Summary
Fast blink of blue status LED (frequency 4 blinks / sec)- Awaiting a device to pair manually
Slow blink of blue status LED (frequency 1 blink / sec)- Pairing list has been cleared.
Solid blue status LED- BT interface is currently paired with a device.
No blue status LED- BT interface is not currently paired.
3.1.2 BT Receiver (Audio Input): Operation Quick Summary
Short button press (< 2 sec) - BT Interface disconnects from currently paired device. Auto-connect is
disabled, awaits manual pairing.
Long button press (> 2 sec) - BT Interface disconnects from currently paired device and deletes the
internal pairing list of previously connected devices. Awaits manual pairing.
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3.2 Bluetooth Audio Transmitter Operation
The Bluetooth Audio Transmitter is configured to implement an A2DP profile in source mode. In this
mode, the transmitter encodes audio, and sends it over the Bluetooth link.
1. Upon power up the LED will be off. The unit will search for an attempt to pair with the last paired
headphone. If a headphone is found then it is connected and the LED will turn on.
2. If the button is pressed, then any stored pair is deleted and the unit goes into AutoPair mode for
60 seconds. The blue light blinks while in AutoPair mode. The Bluetooth Audio Transmitter will
pair with the first headphones it finds that are also in pairing mode. If no connection is found the
LED will turn off and the unit will go into standby and make no connection until the button is
pressed again.
3. If a paired headphone is removed or powered off, the blue LED status light will turn off. The unit
will wait for the return of the headphone and automatically re-pair when found.
3.2.1 BT Transmitter: LED Status Quick Summary
Fast blink of blue status LED (frequency 2 blinks / sec) - In AutoPair mode. Will connect to first
headphones it finds that are also in pairing mode.
Solid blue status LED- BT transmitter is currently paired with a device.
No blue status LED- BT transmitter is not paired. If there is a previous pairing then the unit will attempt
to connect with the last paired headphones.
3.2.2 BT Transmitter: Operation Quick Summary
Button press - BT Interface disconnects from currently paired device and places the unit in AutoPair
mode for 60 seconds. To connect to a headphone you must place the headphone in pairing mode.
3.3 Notes on Latency
The Bluetooth Audio stream introduces latency (delay) in the audio signal. Typically this latency is
approximately 150 ms. This small delay is unimportant unless the audio is accompanying a video
image. In this case any delay greater than about 50mS can be detected as lack of synchronization with
lips or other sounds on the video. Typically a modern device such as a smart phone or tablet will adjust
the video to insure synchronization when it knows that the audio is going over a Bluetooth stream.
Therefore, the Alto BT Receiver should always provide synchronized audio if the user connects a
modern device to watch video.
The BT Transmitter however cannot adjust the video delay on the cabin monitor because they are
independent and unrelated subsystems, unlike the video / Bluetooth audio relation in an integrated
device such as a tablet or cell phone. In this case it is important to employ Low-Latency headphones if
the user desires to view cabin video while listening to the audio over the Bluetooth link. The Alto BT
Transmitter incorporated a special codec known as aptX-LL®. A list of headphones supporting the
aptX-Low Latency can be found here
https://www.aptx.com/products?field_aptx_type_tid=484&field_product_category_tid=125
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4.0 INSTALLATION
4.1 BT Radio Emission Installation Note
Note that the 107840 transmitter and receiver both transmit radio energy in the
frequency range of 2.400 GHz to 2.485 GHz and its related harmonics. The installer
must verify that this Bluetooth radio installation does not adversely affect simultaneous
operation of required aircraft radio receivers.
4.2 General
The information in this section assists the installer of the unit. Conformity to the electrical
wiring and mechanical mounting guidelines will help to ensure proper operation of the
unit.
Review all information in this section before proceeding with the installation of the unit.
For assistance during installation please contact Alto using the following contact
information:
Alto Aviation
86 Leominster Rd
PO Box 399
Sterling, MA 01564
Phone: 978.466.5992
800.814.0123
Fax: 978.466.5996
E-mail: tech@altoaviation.com
www.altoaviation.com
When connecting this unit to another manufacturer’s product, consult the manufacturer’s
specifications and installation instructions pertaining to their equipment.
The product is qualified to TSO-C139a and RTCA/DO-214a. The conditions and tests
for TSO approval of this article are minimum performance standards. Those installing
this article, on or in a specific type or class of aircraft, must determine that the aircraft
installation conditions are within the TSO standards. The article may be installed only
following 14 CFR part 43 or the applicable airworthiness requirements.
The software in this unit is certified to TSO-C139a at Design Assurance Levels E. This
unit is suitable for installation where the failure condition of the unit is considered to be
‘No Effect’.
This component is not intended to perform essential aircraft communication functions.
This component exceeds the maximum audio delay requirements of RTCA/DO-214A.
Any changes or modifications not expressly approved by Alto could void the user's
authority to operate the equipment.
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4.3 Unpacking and Inspection
Carefully open the packaging and remove the product. Visually inspect the unit for evidence of physical
damage during shipment. Retain the packing materials and all documentation received with the unit.
Verify that all components on the packing list have been received.
If the unit has been damaged during shipment, contact Alto. A claim must be filed immediately after
unpacking. Alto will assign a RMA Number (Returned Material Authorization) and give instructions for
shipment. Please use the original carton and packing materials for return shipping.
4.4 Mounting Considerations
Allow sufficient room to connect and disconnect the wiring harness.
The Bluetooth Audio Interface is designed to be mounted in any suitable orientation. The unit is
designed to connect to devices in the cabin via radio waves, therefore it is important to mount the unit
as close as possible to the passenger area. Also, care should be taken to insure that the unit is not
shielded or enclosed behind metal panels. This includes metal skinned or mesh honeycomb panels.
Figure 10: Avoid mounting the Bluetooth Audio Interface behind metal skinned or mesh honeycomb
panels
Wireless Bluetooth
Audio Stream
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4.5 Electrical Load Analysis
Prior to installation, perform an electrical load analysis on the aircraft. Use the following values to
support the analysis:
● 28 VDC Maximum Load: 30 mA
Ensure that the power input to the unit is circuit-protected.
4.6 Bonding
If bonding is required for installation and the unit is not mounted directly to the aircraft chassis, it is
recommended to attach a bonding wire from the aircraft chassis to the unit’s chassis using one of the
mounting slots and appropriate hardware. The enclosure plating is yellow chromate.
4.7 Wire Shielding
Wire bundles that include I/O signals, which interconnect ALTO CSS components, should have a
shield(s) to prevent damage from high voltage surges such as lightning strikes. Examples of I/O pins
that require shielding include, but are not limited to, LED’s, status outputs, switches etc. The shield
should be grounded at both ends. A single shield can be used for a large wire bundle or multiple
individual shields can be used for each wire.
4.8 FCC Regulations
This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment.
End users must follow the specific operating instructions for satisfying RF exposure compliance. This
transmitter meets both portable and mobile limits as demonstrated in the RF Exposure Analysis. This
transmitter must not be co-located or operating in conjunction with any other antenna or transmitter
except in accordance with FCC multi-transmitter product procedures.
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4.9 Functional Hazard Assessment (FHA)
Classification of
Failure Conditions
No Safety Effect
Minor
Major
Effect
No effect on operational
capabilities or safety
Slight reduction in functional
capabilities or safety margins
Significant reduction in functional
capabilities or safety margins
FUNCTIONAL HAZARD ASSESSMENT (FHA)
Aircraft Function
Classification of Failure Conditions
Analysis Consideration
Total Loss of
Function
Loss of Primary
Means of Providing
Function
Misleading and/or
Malfunction
Without Warning
Bluetooth
Entertainment
Audio
No Safety Effect
No Safety Effect
No Safety Effect
Failure modes:
Unable to pair – No Bluetooth Entertainment Audio
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Alto BTT-400 User manual

Alto
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Alto
Model
BTT-400
Type
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