Grandstream Networks GMD1208 User manual

Grandstream Networks, Inc.
GMD1208
Desktop Wireless Microphone
User Guide

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GMD1208 User Guide
Version 1.0.1.31
COPYRIGHT
©2020 Grandstream Networks, Inc. http://www.grandstream.com
All rights reserved. Information in this document is subject to change without notice. Reproduction or
transmittal of the entire or any part, in any form or by any means, electronic or print, for any purpose without
the express written permission of Grandstream Networks, Inc. is not permitted.
The latest electronic version of this guide is available for download here:
http://www.grandstream.com/support
Grandstream is a registered trademark and Grandstream logo is trademark of Grandstream Networks, Inc.
in the United States, Europe, and other countries.
CAUTION
Changes or modifications to this product not expressly approved by Grandstream, or operation of this
product in any way other than as detailed by this guide, could void your manufacturer warranty.
WARNING
Please do not use a different power adaptor with devices as it may cause damage to the products and void
the manufacturer warranty.

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GMD1208 User Guide
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FCC Caution:
Any Changes or modifications not expressly approved by the party responsible for compliance could void
the user's authority to operate the equipment.
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.
Note: 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.
RF Exposure Statement
This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment.

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GMD1208 User Guide
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ISEDC Warning
This device complies with Innovation, Science and Economic Development Canada License exempt RSS
standard(s). 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 of the device.
Le présent appareil est conforme aux CNR d’Innovation, Sciences et Développement économique
Canada applicables aux appareils radio exempts de licence. L'exploitation est autorisée aux deux
conditions suivantes:
(1) l'appareil ne doit pas produire de brouillage, et
(2) l'utilisateur de l'appareil doit accepter tout brouillage radioélectrique subi, même si le brouillage est
susceptible d'en compromettre le fonctionnement.
The device is compliance with RF exposure guidelines, users can obtain Canadian information on RF
exposure and compliance.
Le présent appareil est conforme
Après examen de ce matériel aux conformité ou aux limites d’intensité de champ RF, les utilisateurs
peuvent sur l’exposition aux radiofréquences et compliance d’acquérir les informations correspondantes.
For CE:
Frequency Range
Transmit Power
Bluetooth
2402~2480MHz
3.60dBm
BLE
2402~2480MHz
3.80dBm
2.4G Radio
2402~2480MHz
5.41dBm

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GMD1208 User Guide
Version 1.0.1.31
Table of Content
DOCUMENT PURPOSE .................................................................................................9
CHANGE LOG..............................................................................................................10
Firmware Version 1.0.1.31...................................................................................................................10
WELCOME ................................................................................................................... 11
PRODUCT OVERVIEW ................................................................................................ 12
Feature Highlights................................................................................................................................12
GMD1208 Technical Specifications .....................................................................................................12
GETTING STARTED.....................................................................................................14
Equipment Packaging..........................................................................................................................14
Product Description..............................................................................................................................15
GMD1208 Wireless interface: 2.4G / BT .............................................................................................16
Powering up/off the GMD1208 ............................................................................................................16
Power on.......................................................................................................................................16
Power off.......................................................................................................................................16
Restarting the GMD1208 .....................................................................................................................16
Charging the GMD1208.......................................................................................................................17
DEPLOYMENT SCENARIOS .......................................................................................18
Professional usage: Small Meeting Room...........................................................................................18
Using single GMD1208.................................................................................................................18
Using two GMD1208 connected to GVC3220 ..............................................................................18
Education Usage: Remote Classroom.................................................................................................19
Personal Usage ...................................................................................................................................19
CONNECTION MODES ................................................................................................20
2.4G Mode ...........................................................................................................................................20
BT Mode (Bluetooth Mode)..................................................................................................................20
UAC Mode ...........................................................................................................................................20

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CONNECTING THE GMD1208.....................................................................................21
Connecting GMD1208 to GVC3220 (2.4G) .........................................................................................21
Pairing Steps ................................................................................................................................21
Successful Connection .................................................................................................................22
Pairing Timeout.............................................................................................................................23
Unpaired .......................................................................................................................................23
Connecting GMD1208 to Host (BT Mode)...........................................................................................23
Pairing Steps ................................................................................................................................23
Successful Connection .................................................................................................................23
Unpaired .......................................................................................................................................23
Connecting GMD1208 to Laptop via USB Cable (UAC Mode) ...........................................................24
Connection Steps .........................................................................................................................24
USING THE GMD1208 .................................................................................................25
2.4G Mode ...........................................................................................................................................25
Idle Status.....................................................................................................................................25
Host incoming/outgoing call..........................................................................................................25
Host in call ....................................................................................................................................25
BT Mode...............................................................................................................................................25
Idle Status.....................................................................................................................................25
Host incoming/outgoing call..........................................................................................................25
Host in call ....................................................................................................................................25
UAC Mode ...........................................................................................................................................25
Idle Status.....................................................................................................................................25
Host incoming/outgoing call..........................................................................................................26
Host in call ....................................................................................................................................26
Mute/Unmute Call ................................................................................................................................26
UNDERSTANDING LED INDICATORS ........................................................................27
GMD1208 FUNCTIONALITIES.....................................................................................29
MAINTENANCE............................................................................................................30

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Upgrading the GMD1208.....................................................................................................................30
Factory Reset the GMD1208 ...............................................................................................................31
EXPERIENCING THE GMD1208..................................................................................32

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GMD1208 User Guide
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Table of Tables
Table 1: GMD1208 Features in a Glance....................................................................................................12
Table 2: GMD1208 Technical Specifications...............................................................................................12
Table 3: Equipment Packaging ...................................................................................................................14
Table 4: Charging Status.............................................................................................................................17
Table 5: GMD1208 LED Indicator Descriptions ..........................................................................................27
Table 6: GMD1208 Functionality Trigger Conditions ..................................................................................29
Table of Figures
Figure 1: GMD1208 Package Content........................................................................................................14
Figure 2: GMD1208 front and back view ....................................................................................................15
Figure 3: GMD1208 connected to GVC3220 ..............................................................................................20
Figure 4: Wireless Microphone Disconnected ............................................................................................21
Figure 5: Wireless Microphone - Instructions..............................................................................................22
Figure 6: Wireless Microphone Connecting ................................................................................................22
Figure 7: GMD1208 Windows Drive ...........................................................................................................30
Figure 8: GMD1208 version.txt file .............................................................................................................30

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GMD1208 User Guide
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DOCUMENT PURPOSE
This document describes how to set up the GMD1208 and link it to a host device as well as understanding
the LED status indicators.
This guide covers following topics:
•Product Overview
•Getting Started
•Deployment Scenarios
•Connection Modes
•Connecting the GMD1208
•Using the GMD1208
•Understanding LED Indicators
•GMD1208 Functionalities
•Maintenance
•Experience the GMD1208

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GMD1208 User Guide
Version 1.0.1.31
CHANGE LOG
This section documents significant changes from previous versions of GMD1208 user manuals. Only major
new features or major document updates are listed here. Minor updates for corrections or editing are not
documented here.
Firmware Version 1.0.1.31
•This is the initial version.

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GMD1208 User Guide
Version 1.0.1.31
WELCOME
Thank you for purchasing Grandstream GMD1208 Desktop Wireless Microphone. This User Guide
describes the basic concept and tasks necessary to use and configure your GMD1208. This document
covers the topics of microphone environment setups, start the device and the relevant operations like reset
and upgrade. Please visit http://www.grandstream.com for additional information.
GMD1208 is an extension microphone companion device for Grandstream audio and video conference
products such as GAC25x0 and GVC32x0 series to increase the overall audio coverage range. With
ultrasound pairing, long talk time, proprietary 2.4G/BLE dual mode and error-resilient long-distance
transmission, GMD1208 brings mobility and flexibility to your powerful conference solutions with ease. Each
GMD1208 unit supports 360-degree full band quality voice pickup, within a radius of 26 feet (8 meters) for
the best user experience. GMD1208 features a multifunctional touch key works just like your Bluetooth
headphone, a LED indicator for status notifications, a well-designed wired/wireless charging base, all these
user-friendly features make GMD1208 an ideal choice for organizations that need optimal microphone
placements with ultra-wide room coverage and crystal-clear audio quality.

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GMD1208 User Guide
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PRODUCT OVERVIEW
Feature Highlights
The following table contains the major features of the GMD1208:
Table 1: GMD1208 Features in a Glance
GMD1208 Technical Specifications
The following table resumes all the technical specifications for the GMD1208.
Table 2: GMD1208 Technical Specifications
MIC
8 omni-directional
Maximum connection
distance
Up to 26 ft./~7.9 meters pickup range
In 2.4G mode: up to 66 ft./~20 meters.
In Bluetooth mode: up to 33 ft./~10 meters.
Audio Features
ANS, AGC/DRC, Anti-howling, Noise shield
Audio Codec
Opus
Mode Switch
Proprietary 2.4GHz, Bluetooth
Bluetooth
Bluetooth 2.1+EDRRate: 1 Mb/s for BR, 3Mb/s for EDR
Cascade Ability
Up to 2
Auxiliary Ports
Micro-B USB port
LED
1x tri-color LED for status indication
1x dual color LED for mute status indication
1x dual color LED for power indication
Power & Green
Energy Efficiency
Universal power adapter included
Input: 220V, Output: 5V, 1A
1500mAh Lithium-ion battery, 150h standby time and 12h talk time
GMD1208
•Capacitive touch mute button with LED
•1500mA built-in Li-ion battery
•Micro-B port for charging, BYOD microphone and upgrading
•Low power indicator
•Bluetooth v2.1+EDR protocols
•Proprietary 2.4GHz wireless technology
•Ultrasound pairing technology
•High quality audio coding with error tolerance
•Built-in 8 omni-directional MEMS with 26 feet/~7.9 meter pickup range

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GMD1208 User Guide
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Physical
Unit Dimension: 105(mm)×105(mm)×16.9(mm) ;
Unit Weight: 131.4g
Package Dimension:185(mm)×137(mm)×60(mm);
Package Weight: 330.5g
Environmental
Operation: 0°C to 40°C
Storage: -10°C to 60°C,
Humidity: 10% to 90% Non-condensing
Package Content
1x GMD1208 microphone, 1x USB cable, 1x Power supply, 1x quick installation
guide, 1x GPL license
Compliance
FCC: Part 15 (CFR 47) Class B; UL 60950 (power adapter); Part68 (HAC)
CE: EN55022 Class B, EN55024, EN61000-3-2, EN61000-3-3, EN60950-1,
EN62479, RoHS
RCM: AS/ACIF S004; AS/NZS CISPR22/24; AS/NZS 60950; AS/NZS 4268
IC: ICES 003, RSS 247, CS 03, RSS 102

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GMD1208 User Guide
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GETTING STARTED
This chapter provides basic installation instructions including the list of the packaging contents and
information for obtaining the best performance with the GMD1208.
Equipment Packaging
Table 3: Equipment Packaging
Note: Check the package before installation. If you find anything missing, contact your system administrator.
GMD1208
•1xGMD1208 microphone
•1x USB cable
•1x Power Supply (5V,1A)
•1x Quick installation guide
•1x GPL License
Figure 1: GMD1208 Package Content

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GMD1208 User Guide
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Product Description
Figure 2: GMD1208 front and back view
Note: Please make sure to set up the correct mode (2.4G or BT) for the microphone. Then, refer to
[CONNECTION MODES] section on this document to lean and understand the related LED indicators.

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GMD1208 Wireless interface: 2.4G / BT
To select 2.4G or Bluetooth connection modes, switch using the key on the back of the unit.
Notes:
•2.4G connection mode can be used with GVC3220 only.
•Bluetooth can be used with majority of devices supporting Bluetooth.
•For more details, refer to [CONNECTION MODES] section.
Powering up/off the GMD1208
Power on
Touch and hold multifunctional button for 1 second when the device is off.
Notes:
•The mute indication will be flashing fast in green during boot up.
•If the GMD1208 was not successfully paired either in 2.4G mode or in BT mode for 10 minutes.
The mute indicator and working indicator will blink red fast 3 seconds before power off to save
energy.
Power off
•Forced shutdown: Touch and hold the multifunctional button for 10 seconds.
•Normal shutdown: Touch and hold the multifunctional button for 5 seconds.
Notes:
•All the GMD1208 indicator lights turn off.
•It functions as restart when USB is connected.
Restarting the GMD1208
Touch and hold the mute key for 10 seconds and then re-touch and hold the mute key for 1 seconds.

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GMD1208 User Guide
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Charging the GMD1208
Plug the GMD1208 to the power source via USB cable and provided power supply (or other power source).
OR
The power indicator will show the charging status as described below:
Table 4: Charging Status
LED Indicator
Status
Description
Power Indicator
Green Slow flashing
Charging
Green solid
Fully charged
Red slow flashing
Power less than 30%

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DEPLOYMENT SCENARIOS
Professional usage: Small Meeting Room
Using single GMD1208
Using two GMD1208 connected to GVC3220
Up to 8 attendees
GMD1208
r=3m

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Education Usage: Remote Classroom
Personal Usage

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GMD1208 User Guide
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CONNECTION MODES
The GMD1208 can be connected as microphone via following modes:
2.4G Mode
The 2.4G (ultrasound pairing technology) can be exclusively used with GVC3220 Ultra HD Multimedia
Conferencing System.
Notes:
•GVC3220 can connect up to 2x GMD1208 wireless microphones at the same time.
•When GVC3220 works with GMD1208, the max distance between them is 66 feet / ~20 meters.
BT Mode (Bluetooth Mode)
BT Mode (Bluetooth® Mode) can be used with host supporting Bluetooth® technology.
UAC Mode
UAC Mode can be used to connect GMD1208 to laptop via USB cable.
Figure 3: GMD1208 connected to GVC3220