Using the included audio cable (configuring the ABC switch)



Standard audio cable vs. EHS cable

Included in the box with DW, SD and D 10 headsets is an audio cable for connecting the base station to your deskphone. If you use this cable, please note that you will not be able to use the multifunction button on the headset to answer and end calls, nor will you receive an incoming call alert tone in the headset. 

You will, however, be able to use the headset to speak and to hear after first manually accepting an incoming call on the deskphone. 

If you wish to take advantage of call control and your headset's remote answering functionality, please see the entry on call control for more information.  



Configuring the base station using the ABC switch

Rather than to produce multiple cables for a standard audio connection, Sennheiser Communications includes but one audio cable and instead allows users to change the configuration on the base station to match the deskphone using the ABC switch located on the back of the base station (or on the underside for SD base stations). Configuration of this switch is very important. A wrong configuration of the switch can cause echoes or no sound in the headset.

This switch has three different settings (A, B and C) depending on which deskphone is being used in the configuration. To determine the best setting for any particular setup, you can either use the dial tone, or make a dummy call to a colleague or friend, and then manually shift the switch until you find the optimal setting.

To test the settings using the dial tone, follow these steps. 

  • Put on the headset.
  • Press the multifunction button on the headset to activate an active connection with the base station. The blue LED on the base station should be illuminated.
  • Lift the handset, at which point you should hear a dial tone.
  • Try out each of the settings on the ABC switch to determine with which setting the user can hear a clear dial tone. 

If attempting to determine the best setting by means of a dummy call, simply initiate a call after the dial tone can be heard. Using a dummy call instead of the dial tone allows the user to ensure that the settings are also optimal for the receiving side of the call. 

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