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  • How many Expansion Modules D3,D7 can I connect to my Snom deskphone

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Every Snom phone with a USB port can handle up to 3 expansion modules (D3 / D7).

Please note that only the first expansion module can be supplied with power from the telephone.  For the second expansion module you have to use an external power supply; the third module's power is supplied by the second module.