Yealink EXP40 Quick Start Guide

2. Follow the same step to connect two expansion modules:
Your phone and the two expansion modules will be connected as shown below:
2
Connecting two Modules
Note: The T48S/T46S/T42S/T41S Skype for Business phone can support six expansion modules at
most. But if you use more than two expansion modules, you need to connect an additional
power adapter to any one of the expansion modules.
Connecting the Cords
3. Connect the Ext jack of the IP phone and the Ext in jack of the first module using a connecting
cord. If you want to connect another module, connect the Ext out jack of the first module and
the Ext in jack of the second module using a connecting cord.

Yealink EXP40 Specifications

General

Product color	Black
Number of buttons	20 buttons
Compatible products	SIP-T46G, SIP-T48G
Keypad illumination	Yes
Operating temperature (T-T)	-10 - 50 °C
Operating relative humidity (H-H)	10 - 95 %

Weight and Dimensions

Weight	6700 g
Dimensions (WxDxH)	127 x 213 x 167 mm