TELEPHONE
HEADSET SYSTEM
S12
QUICK START USER GUIDE
WELCOME
The S12 Telephone Headset System is designed to add a headset to an existing telephone.
The S12 System provides precise levels of listening and talking comfort and crystal clear voice quality.
The S12 System is not designed to work on telephones that have the dial pad in the handset or on cordless telephones.
This user guide provides the following steps to quickly set up and use your headset system.
1.Identify the Components
2.Attach to Telephone
3.Set Amplifier Compatibility Switch
4.Make a Test Call
The other side has more details:
■Examine other features
■Troubleshooting
■Technical Support Center Information
■FCC Information
■Parts and Accessories
■Warranty and Service
IMPORTANT SAFETY INFORMATION
Read and follow all instructions and warnings prior to using the product.
When using your telephone equipment, these instructions and warnings should be followed to reduce the risk of fire, electric shock, injury to persons, and damage to property.
WARNINGS
For your comfort, health, and safety, do not exceed moderate listening levels.
Use only the Listed AC power adapter supplied by Plantronics.
Unplug this product from the wall outlet before cleaning. Do not use liquid cleaners or aerosol cleaners.
Avoid contact with liquids. Do not locate this product near water, for example, near a
This product should never be placed near or over a radiator or heat register. This product should not be placed in a
Do not allow anything to rest on the power cord. Do not locate this product near operating machinery or in areas where the power cord is likely to be damaged by furniture or foot traffic.
Discontinue use of product and contact Plantronics if the product overheats, has a damaged cord or plug, has been dropped or damaged, or if the product has been dropped in water.
Do not overload outlets and extension cords as this can result in the risk of fire or electric shock.
Never disassemble or push objects of any kind into this product as this may short out parts that could result in a fire or electric shock.
Use caution when installing or modifying telephone lines.
Do not use the telephone equipment to report a gas leak in the vicinity of the leak.
S12 QUICK START GUIDE
1Identify the
Components
1 Adjustable
Headband
2Headset
Assembly |
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3 Clothing Clip |
4Headset Plug
5 Microphone
Boom
6 Ear Cushion
Assembly
7Earloop
8 Pivot Ball Ring
9Firefly® 
Indicator
converts to |
Left Side View
10 Headset Holder
11 Compatibility Slide
Switch 
12 S12 Amplifier
13 Headset Indicator (Green)
14 Power Indicator | Right Side View | |
(Green) | ||
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15Mute Indicator (Red)
16 Listen Volume Control
17 Mute Button
18 Headset/Handset
Button
19Speak Volume Control
20 Speak Volume Master
(Hi, Low) Switch
21 Cord (Phone to Amplifier)
22AC Power Adapter 
Back View
23 AC Power
Adapter Jack
24 Headset Jack
25Handset Jack
26 Telephone Base Jack
Attach |
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Amplifier to |
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Telephone |
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Unplug your telephone |
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22.1 |
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handset cord from the |
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telephone base. | 2.1 |
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2.2 Plug your telephone |
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handset cord into the S12 |
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amplifier handset jack. |
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2.3 Connect the cord 21 | 2.4 | 2.2 |
between the telephone base | ||
jack on the S12 amplifier and |
| 2.3 |
your telephone base. |
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2.4 Plug the headset plug into the headset jack.
2.5Route the headset cord through the cable management channel on the bottom of the amplifier (not shown).
2.6Snap in the headset holder 10 (not shown).
2.7Plug the AC power adapter into the AC power adapter jack
and plug into a standard AC wall output.
2.7
Set Amplifier |
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Compatibility |
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3Slide Switch |
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3.1 Put on headset and press the | 3.1 |
headset button. |
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The headset indicator 13 should be |
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on (green). |
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3.2 Lift the telephone’s handset off |
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the cradle and place it on your |
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desk. | 3.2 |
3.3 If you hear a clear dial tone, you can proceed to Step 4.
3.4 If you don’t hear a dial tone, adjust the compatibility slide switch following this process:
4Make a
Test Call
4.1Verify that the mute button is off.
The mute indicator should not be illuminated
4.2Remove the phone handset from the cradle and place on your desk.
4.1
1.If you do not hear a dial tone in the
headset, press the headset button.
The headset indicator is on.
4.3 Use your telephone keypad to call a friend or colleague.
4.4Adjust the listen volume using the listen volume control.
1. Slide the compatibility slide switch until you hear a clear dial tone.
There may be multiple settings with a dial tone. Select the one that sounds most like the handset of your phone.
Experimenting with various switch settings will not harm the amplifier or your telephone.
4.5 If your friend cannot hear you, or you | 4.21 |
hear a buzz or hum, try changing the | 4.4 |
compatibility slide switch. |
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3.4
4.6Adjust how loud you sound to the other party by adjusting the speak volume control.
4.7If you sound too loud, move the speak
volume master switch to its lower setting and adjust the speak volume control.
4.8 After completing the call, return the |
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handset to its cradle. | 4.6 |
4.5
4.7 |
