Telephony Cards

Modules and Accessories

Add-on hardware modules and accessories for analog and digital cards

Echo Cancellation Modules

For Asterisk users who connect to the PSTN, echo with the voice communication is possible and can be managed effectively with echo cancellation solutions from Digium. Asterisk itself offers a range of software-based open source echo cancellation routines that are moderately effective in eliminating the echo that most Asterisk users experience. However, there are cases in which these algorithms are not effective. To combat this, Digium offers a line of DSP-based echo cancellation modules for all of our analog and digital (T1/E1/J1) cards with the VPMOCT series modules.

photo of digium card echo cancellation module
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Quad Channel Analog Modules

Digium quad channel analog modules allows 800 Series or 2400 Series telephony cards to terminate four (4) line (FXO) or station (FXS) connections per module.

photo of digium card quad channel analog module
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Single Channel Analog Modules

Digium single channel analog modules allows 400 Series or 800 Series telephony cards to terminate one (1) line (FXO) or station (FXS) connections per module.

 

image of a single channel analog module
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Analog FXS Module Power Supply

FXS modules provide ringing voltage and battery to telephones or handsets and require substantial amount of 12V DC power in order to operate properly. The PCI interface on motherboards cannot provide sufficient quantities of this voltage necessary to ring 4, 8 or 24 modules. As a solution, Digium analog cards are mounted with a 4-pin disk-drive or Molex connector on the base board. This connector must be supplied with an internal power connector from the system's power supply if FXS modules are in use.

image thumbnail of analog fxs module power supply
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