Telex Ascend Series User manual

LIT000403000 Rev A 12/2009

PROPRIETARY NOTICE
The product information and design disclosed herein were originated by
and are the property of Bosch Security Systems, Inc. Bosch reserves all
patent, proprietary design, manufacturing, reproduction, use and sales
rights thereto, and to any article disclosed therein, except to the extent
rights are expressly granted to others.
COPYRIGHT NOTICE
Copyright 2009 by Bosch Security Systems, Inc. All rights reserved.
Reproduction, in whole or in part, without prior written permission from
Bosch is prohibited.
WARRANTY
BOSCH COMMUNICATIONS, INC.
UNIFORM LIMITED WARRANTY
Bosch Broadcast Headsets branded products are warranted by Bosch
Communications, Inc. against malfunction due to defects in materials
and workmanship for 5 year, beginning with the date of the original
purchase by the end-user. If such malfunction occurs during the
specified period, the product will be repaired with new or re-
manufactured equivalent parts and products or replaced (at our option)
without charge. The product will be returned to the customer prepaid.
EXCLUSIONS AND LIMITATIONS:
The Limited Warranty does not apply to: (a) exterior finish or
appearance; (b) certain specific items described in the individual
product-line statements below, (c) malfunction resulting from use or
operation of the product other than as specified in the product data sheet
or user’s manual; (d) malfunction resulting from misuse or abuse of the
product, including accidents; (e) defects resulting from excess moisture,
lightning or power surges; or (f) malfunction occurring at any time after
repairs have been made to the product by anyone other than a Bosch
Service Department or any of its authorized service representatives. The
Warranty is void if the label bearing the product serial number (if
applicable) has been removed or defaced.
OTHER EXPRESS OR IMPLIED WARRANTIES
EXCLUDED:
TO THE EXTENT PERMITTED BY APPLICABLE LAW, THE
WARRANTIES SET FORTH HEREIN ARE IN LIEU OF, AND
EXCLUSIVE OF, ALL OTHER WARRANTIES, EXPRESSED OR
IMPLIED. SPECIFICALLY EXCLUDED, WITHOUT LIMITATION,
ARE THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR
USE OR FOR PARTICULAR PURPOSE, AND WARRANTIES
ARISING FROM COURSE OF DEALING OR USAGE OF TRADE
OR ANY OTHER MATTER. IF, UNDER APPLICABLE LAW,
IMPLIED WARRANTIES MAY NOT BE VALIDLY EXCLUDED,
THE DURATION OF SUCH IMPLIED WARRANTIES IS LIMITED
TO THE WARRANTY PERIOD.
LIMITATION OF REMEDIES, CERTAIN DAMAGES
EXCLUDED:
REPAIR OR REPLACEMENT OF DEFECTIVE PRODUCTS ARE
THE SOLE AND EXCLUSIVE REMEDIES PROVIDED BY BOSCH
TO THE CUSTOMER OR TO ANY OTHER PERSON AND SHALL
CONSTITUTE FULL SATISFACTION OF ALL CLAIMS,
WHETHER BASED ON CONTRACT, NEGLIGENCE, STRICT
LIABILITY OR OTHERWISE. BOSCH’S MAXIMUM LIABILITY
SHALL NOT EXCEED THE ACTUAL PURCHASE PRICE PAID
FOR THE PRODUCT BY THE CUSTOMER. BOSCH AND ITS
SUBSIDIARIES SHALL NOT BE LIABLE FOR ANY INDIRECT,
INCIDENTAL, PUNITIVE, SPECIAL OR CONSEQUENTIAL
DAMAGES INCLUDING, WITHOUT LIMITATION, INJURY TO
PERSONS OR PROPERTY OR LOSS OF USE. SOME STATES AND
COUNTRIES DO NOT ALLOW THE EXCLUSION OR LIMITATION
OF CERTAIN DAMAGES, SO THE ABOVE LIMITATION OR
EXCLUSION MAY NOT APPLY TO YOU. IN SUCH STATES AND
COUNTRIES, BOSCH SHALL BE LIABLE FOR NO MORE THAN
THE DIRECT DAMAGES FOR BODILY INJURY AND/OR REAL
OR PROPERTY ARISING FROM THE NEGLIGENCE OF BOSCH.
OTHER RIGHTS:
This warranty gives you specific legal rights, and you may also have
other rights, depending upon where you live.
OBTAINING WARRANTY SERVICE:
To obtain warranty service, a customer must deliver the product,
prepaid, to the appropriate Bosch Service Department listed below or
any of its authorized service representatives together with proof of
purchase of the product in the form of a bill of sale or invoice. Send all
Headsets to:
Factory Service Department
Bosch Communications, Inc.
8601 East Cornhusker Hwy.
Lincoln, NE 68507 U.S.A
Attn: Service
APPLICABLE LAW:
The validity, performance and construction of this Limited Warranty
shall be governed by the laws of the State of Minnesota without
reference to its choice of law principles. The Minnesota federal courts
and/or the state courts located in Hennepin County, Minnesota, shall
have exclusive personal and subject matter jurisdiction over, and the
parties shall each submit to the jurisdiction of such courts and to venue
in Minnesota with respect to any dispute concerning the product or
pursuant to this Limited Warranty, and all objections to such jurisdiction
or to such venue are hereby waived.
REGULATORY INFORMATION
FCC
This device complies with part 15 of the FCC
Rules. Operation is subject to the following
two (2) 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.

FAA
The Telex Ascend Headset (with or without microphone) is approved for aircraft use under FAA TSO-C139.
The conditions and tests required for the TSO approval of this article are minimum performance standards. It is the responsibility of
those installing this article, either on or within a specific type or class of aircraft, to determine that the aircraft installation conditions are
within the TSO standards. TSO articles may have separate approval for installation on aircraft. The article may be installed only if
performed under 14 CFR part 43 or the applicable air-worthiness requirements.
The Telex Ascend Headset is TSO-C139 approved. Tests were conducted using RTCA DO-214 and DO-160E. The headset was
designed and is manufactured to meet the following environmental categories:
CONDITIONS DO-160E SECTION DESCRIPTION OF TESTS CONDUCTED
Temperature and Altitude 4.0
Low Temperature 4.5.1 Equipment tested to Category A1
High Temperature 4.5.2 & 3 Equipment tested to Category A1 with 70°C max. exception by DO-214
2.5.1.2
In-Flight Loss of Cooling 4.5.4 Equipment identified as Category X, N/A
Altitude 4.6.1 Equipment tested to Category A1
Decompression 4.6.2 Equipment tested to Category A1/45000ft.
Overpressure 4.6.3 Equipment tested to Category A1
Temperature Variation 5.0 Equipment tested to Category C
Humidity 6.0 Equipment tested to Category A
Operational Shock and Crash
Safety 7.0 Equipment identified as Category X, N/A by DO-214 2.5.4.1 and 2.5.4.2
Vibration 8.0
Equipment tested to Category S, aircraft zone 2 (instrument panel or
console mounting), Aircraft type 2 (Fixed Wing Turbojet or Turbofan
engines), using vibration test curve B.
Explosive Atmosphere 9.0 Equipment identified as Category X, N/A
Waterproofness 10.0 Equipment identified as Category X, N/A
Fluids Susceptibility 11.0 Equipment identified as Category X, N/A
Sand and Dust 12.0 Equipment identified as Category X, N/A
Fungus 13.0 Equipment identified as Category X, N/A
Salt Fog Test 14.0 Equipment identified as Category X, N/A
Magnetic Effect 15.0 Equipment is Category Z
Power Input 16.0 Equipment identified as Category X, N/A by DO-214 2.5.7.1
Voltage Spike 17.0 Equipment tested to Category A
Audio Frequency
Susceptibility 18.0 Equipment identified as Category X, N/A by DO-214 2.5.9
Induced Signal Susceptibility 19.0 Equipment tested to Category A
Radio Frequency Susceptibility 20.0
Transient RF Equipment tested to Category T
Sustained Ambient RF Equipment tested to DO-214 2.5.11.2
Radio Frequency Emission 21.0 Equipment tested to Category M
Lightning Induced Transient
Susceptibility 22.0 Equipment identified as Category XXXXX, N/A by DO-214 2.5.13
Lightning Direct Effects 23.0 Equipment identified as Category X, N/A
Icing 24.0 Equipment identified as Category X, N/A
Electrostatic Discharge 25.0 Equipment identified as Category X, N/A by DO-214
Fire, Flammability 26.0 Equipment identified as Category X, N/A by DO-214
Other Tests Fire resistance tests were conducted in accordance with Federal Aviation
Regulations Part 25, Appendix F.

Headset Configuration Table
NOTE: The table below displays the combination of the headset and cord/boom assembly which have been FAA TSO C139
approved.
An Airworthy headset consists of at minimum two (2) pieces:
1 - headset frame
1 - cable or cable boom assembly
TSO Approved Final Assembly
Part Number Headset Frame Part Number Cord/Boom Part Number
PRD000248000 ASY000798001 ASY000858000
PRD000248050 ASY000798001 ASY000858001
PRD000248100 ASY000798001 ASY000858001
PRD000248150 ASY000798001 ASY000858001
PRD000249000 ASY000798001 ASY000857000
PRD000249050 ASY000798001 ASY000857001
PRD000250000 ASY000798000 ASY000858000
PRD000250050 ASY000798000 ASY000858001
PRD000250100 ASY000798000 ASY000858000
PRD000250150 ASY000798000 ASY000858001
PRD000251000 ASY000798000 ASY000857000
PRD000251050 ASY000798000 ASY000857001
PRD000252000 ASY000798002 ASY000858000
PRD000252050 ASY000798002 ASY000858001
PRD000252100 ASY000798002 ASY000858000
PRD000252150 ASY000798002 ASY000858001
PRD000252500 ASY000798002 ASY000858000
PRD000252550 ASY000798002 ASY000858001

Table
of
Contents
HEADSET CONFIGURATION TABLE ............................................................................................................................................4
INTRODUCTION ........................................................................................................................................ 3
Important Safety Instructions ....................................................................................................................................3
General Description ..................................................................................................................................................3
Features .....................................................................................................................................................................4
Headset – Single-Sided ..............................................................................................................................................5
Dual-Sided Headset Reference Diagram ..................................................................................................................6
Filler Module .............................................................................................................................................................7
Battery Charger .........................................................................................................................................................7
Battery Charger Power Supply .................................................................................................................................8
CONFIGURATION AND INSTALLATION .............................................................................................. 9
Before First Use ........................................................................................................................................................9
BATTERY CHARGING .................................................................................................................................................................9
BATTERY INSTALLATION ............................................................................................................................................................9
Installation Instructions ..........................................................................................................................................10
AIRCRAFT INSTALLATION .........................................................................................................................................................10
AUDIO INPUT INSTALLATION ...................................................................................................................................................11
OPERATION AND MAINTENANCE ...................................................................................................... 13
Operation Instructions ............................................................................................................................................13
REMOVE AND REPLACE MODULES ..........................................................................................................................................13
HEADSET ADJUSTMENT AND SIZING ........................................................................................................................................15
BOOM MIC ADJUSTMENT ........................................................................................................................................................16
TURN THE ANR ON/OFF (ANR CAPABLE HEADSET ONLY) .....................................................................................................17
CONFIGURE THE SPEAKER VOLUME ........................................................................................................................................18
SET MONO OR LEFT ONLY MODE ...........................................................................................................................................19
REPLACE THE EARCUP AND HEADBAND CUSHION ..................................................................................................................20
REPLACE THE WINDSCREEN ....................................................................................................................................................21
ADJUST MICROPHONE GAIN ...................................................................................................................................................22
Care and Maintenance ............................................................................................................................................22
CLEAN THE HEADSET ..............................................................................................................................................................22
STORE/TRANSPORT THE HEADSET ...........................................................................................................................................23
BATTERY MODULE ................................................................................................................................. 25
Battery Module ........................................................................................................................................................25

REPLACE THE BATTERY ...........................................................................................................................................................25
CHARGE THE BATTERY ............................................................................................................................................................26
WIRING DIAGRAMS .................................................................................................................................29
SPECIFICATIONS .....................................................................................................................................31
Specifications .......................................................................................................................................................... 31
TROUBLESHOOTING AND FAQS ..........................................................................................................33
WHERE DO I SEND MY HEADSET FOR REPAIR? .........................................................................................................................33
MYANR (ACTIVE NOISE REDUCTION) IS NO LONGER WORKING. .............................................................................................33
MYHEADSET DOES NOT WORK WITH MY CELL PHONE OR MP3 PLAYER. ..................................................................................33
I NEED PARTS FOR MY HEADSET. .............................................................................................................................................34
TECHNICAL SUPPORT PHONE NUMBER ....................................................................................................................................34
I WANT TO REPAIR MY HEADSET AT HOME. ..............................................................................................................................34
HOW LONG WILL IT TAKE MY HEADSET TO BE REPAIRED? ........................................................................................................34

List
of
Figures
FIGURE 1. Single-Sided Headset Reference View ..................................................................................................5
FIGURE 2. Dual-Sided and ANR Dual-Sided Headset Reference View .................................................................6
FIGURE 3. Filler Module ........................................................................................................................................7
FIGURE 4. Battery Charger Reference Diagram ....................................................................................................7
FIGURE 5. Standard Power Supply and Plug Adapters .........................................................................................8
FIGURE 6. Dual Plug Installation ........................................................................................................................10
FIGURE 7. XLR Plug Installation .........................................................................................................................11
FIGURE 8. Module Release Button .......................................................................................................................13
FIGURE 9. Sliding module out of ear cup .............................................................................................................14
FIGURE 10. Align Mounting Tab ............................................................................................................................14
FIGURE 11. Snap Module in Place .........................................................................................................................15
FIGURE 12. Proper Headset Placement .................................................................................................................15
FIGURE 13. Up and Down Movement of headband and Side to Side Movement of Ear Cup ................................16
FIGURE 14. Boom Mic Movement ..........................................................................................................................16
FIGURE 15. ANR Switch .........................................................................................................................................17
FIGURE 16. Dip Switch Window Location .............................................................................................................18
FIGURE 17. Top Part of the Back Flap – Ear Cushion ..........................................................................................20
FIGURE 18. Headband Replacement ......................................................................................................................20
FIGURE 19. Replace Windscreen ............................................................................................................................21
FIGURE 20. Mic Gain Adjustment Access Hole ......................................................................................................22
FIGURE 21. Carrying Case .....................................................................................................................................23
FIGURE 22. Battery Charger Reference Diagram ..................................................................................................26
FIGURE 23. Power module adapter reference diagram .........................................................................................26
FIGURE 24. Attach Power Supply to Charger ........................................................................................................27
FIGURE 25. Mounting Tab and Mounting Tab Secure Slot ....................................................................................27
FIGURE 26. Snap Module in Place .........................................................................................................................28
FIGURE 27. Dual Plug Wiring Diagram ................................................................................................................29
FIGURE 28. 5-Pin XLR (male) Wiring Diagram ....................................................................................................29
FIGURE 29. Music/Entertainment Module Connector Wiring Diagram ................................................................30

3
CHAPTER 1
Introduction
Important Safety Instructions
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Be sure, while wearing the headset, you are still able to hear all warning tones and signals. If you cannot hear the
warning tones or signals, you may need to adjust your headset.
6. This headset is capable of producing sound pressure levels above 100dB SPL.
7. Refer all servicing to qualified service personnel. Servicing is required when the headset has been damaged in any
way, such as headset cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the
apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.
8. The battery used with these headsets is a Lithium based unit. This unit must only be charged with the Telex specified
battery charger. Care should be used when transporting the battery; when not installed in a headset, battery terminals
must not contact any continuous conductive surface, as this may result in a short circuit situation.
9. Our headsets are designed to be used with one (1) audio input module at a time.
General Description
Congratulations! You have made you first step toward a new level of excellence in headset technology. Introducing the
Ascend, the newest design in headset technology by Telex. The Ascend was designed with you, the user, in mind with its
modular design, installation options, and its multi-functionality beyond the aircraft. The modular design allows you to
interchange different modules to allow the best headset for every environment. The Ascend also can install into an aircraft
using either a dual plug cord, or an XLR connector – you decide. Finally, this headset is not just for the aircraft anymore, by
installing alternate interface modules, you can connect to a GPS, an MP3 player, or many other audio device.

4
Features
Three (3) Headset Frame
Options -
The Ascend gives you three (3) options when selecting the type of headset perfect for your
environment:
•Single-Sided Headset without ANR (Active Noise Reduction)
•Dual-Sided Headset without ANR
•Dual-Sided Headset with ANR
Installation Options - The Ascend has two (2) options for aircraft installation; dual plug or XLR. You can take your
headset to any aircraft installation and plug right in and get to work.
Modular Design - The modular design of the Ascend allows for many options when configuring the perfect headset for
use in your specific environment. All the modules are universal, which means they are fully
interchangeable, giving you more flexibility in your headset needs. The versatility of the Ascend is
obvious when using the music/audio module. The music/audio module turns the aviation headset
into an everyday, everywhere headset, allowing for MP3 player hookup, GPS connection, and many
other applications.
Acoustic Performance - Expanded frequency response ensures clear communications and enhanced audio performance. The
adjustable output level allows the user to match the headset to the requirements of the aircraft.
Acoustic design and active noise reduction, if available, combine to remove common cockpit
noises.
Comfortable Design - The unique design of the Ascend headset with its headband location, in respect to the ear cups,
delivers more stability when the headset is being worn. All user contact points, ear cup cushions,
temple pads, headband cushions, and the windscreen are completely replaceable allowing for good
hygiene.

5
Headset – Single-Sided
FIGURE 1. Single-Sided Headset Reference View
1. Headset Adjustment Slider. For more information, see “Headset Adjustment and Sizing” on page 15.
2. Headband Cushion
3. Temple Pad
4. Ear Cushion
5. Windscreen
6. Boom Mic

6
Dual-Sided Headset Reference Diagram
1. Headset Slider
2. Headband Cushion
3. ANR Switch (ANR equipped module only)
4. Battery Module/Filler Module
5. Ear Cup Cushions
6. Microphone Module
7. Microphone Windscreen
FIGURE 2. Dual-Sided and ANR Dual-Sided Headset Reference View

7
Filler Module
The Filler Module can be used to fill any unused module spots. It can be used on either side of the headset, left or right ear
cup.
Battery Charger
1. Operation Mode LED - For more information, see “Battery Module” on page 25.
2. Module Release Button
3. Power Supply Connector
NOTE: The battery charger uses a universal power pack with a mini-USB connector. Alternative power packs may be
used provided they are equipped with the mini-USB connector, for example a cell phone charger.
FIGURE 3. Filler Module
FIGURE 4. Battery Charger Reference Diagram

8
Battery Charger Power Supply
Standard Power Supply
1. Wall Pack
2. US Plug (standard)
World Power Supply Adapters (Optional - p/n PRD000253005)
3. UK Plug (optional)
4. Euro Plug (optional)
5. Australian Plug (optional)
FIGURE 5. Standard Power Supply and Plug Adapters

9
CHAPTER 2
Configuration and Installation
CAUTION: The Ascend was designed for use in multiple application settings. When using the headset in an aviation
application, use the following sections to verify the proper configuration and settings.
Before First Use
Battery Charging
For information on charging the battery, see “Charge the Battery” on page 26.
Battery Installation
For information on installing the battery, see “Remove and Replace Modules” on page 13.

10
Installation Instructions
NOTE: The Ascend headset dip switches have been set from the factory for use in the most common applications. We
recommend these switches not be changed unless necessary.
Aircraft Installation
REQUIREMENTS: The minimum requirements (see “Headset Configuration Table” on page 4) needed for a typical
aviation configuration include the following:
•Headset (either single-sided or dual-sided)
•Corded Module (no boom)
OR
Corded Module (with boom)
For information on modes of operation dip switch settings, see “Set Mono or Left Only Mode” on
page 19.
For information on configuring the speaker volume, see “Configure the Speaker Volume” on
page 18.
To install the Ascend headset for aircraft use, do the following:
Step 1 Plug the headset into the aircraft console. See “Install the Dual Plug Headset in an Aircraft” on page 10 or
“Install the XLR Plug Headset in an Aircraft” on page 11.
Step 2 Adjust the headset for proper fit and comfort. See “Headset Adjustment and Sizing” on page 15.
Step 3 Adjust the boom mic for proper use. See “Boom Mic Adjustment” on page 16.
Step 4 Turn on ANR (if equipped). See “Turn the ANR On/Off (ANR Capable Headset Only)” on page 17.
Install the Dual Plug Headset in an Aircraft
To install the dual plug headset in an aircraft to the following:
1. Insert the Microphone plug into the microphone jack on the aircraft console.
2. Insert the Headphone plug into the headphone jack on the aircraft console.
For a detailed dual plug wiring diagram, see Figure 27 on page 29.
FIGURE 6. Dual Plug Installation

11
Install the XLR Plug Headset in an Aircraft
To install the XLR plug headset in an aircraft, do the following:
> Insert the XLR plug into the XLR jack on the aircraft audio panel.
For a detailed XLR plug wiring diagram, see Figure 28 on page 29.
Audio Input Installation
The Ascend headset can also be used to listen to music, GPS information, etc.
CAUTION: Be sure to check the volume setting on the audio device you are using to ensure the audio level will not cause any
damage when turned on.
To use the Ascend headset for audio input, do the following:
NOTE: The battery module is only needed when you want to use the ANR feature with the audio input
configuration.
Step 1 If necessary, install the battery module into the headset. See “Battery Module” on page 25.
Step 2 Install the audio input module.
Step 3 Adjust the headset for proper fit and comfort. See “Headset Adjustment and Sizing” on page 15.
FIGURE 7. XLR Plug Installation

12

13
CHAPTER 3
Operation and Maintenance
Operation Instructions
Remove and Replace Modules
All input modules, batteries, filler modules, etc. are removed and replaced the same way.
IMPORTANT: When removing a module, put only enough pressure on the module release button to pop the module
out. The module release button is designed to be used with fingers only.
Do not use any sharp objects or tools to press the module release button.
To remove a module, do the following:
1. Press the module release button located at the bottom of the ear shell.
The module pops up from the ear shell.
FIGURE 8. Module Release Button

14
2. Slide the module out and up taking care to clear the mounting tab from the mounting tab hole.
To replace a module, do the following:
1. Align the mounting tab with the mounting tab hole (see Figure 10).
2. Slide the module into place.
FIGURE 9. Sliding module out of ear cup
FIGURE 10. Align Mounting Tab