Digium Quad FXO Module (X400M)
The Digium X400M FXO module fits both the Digium TDM2400P and Digium TDM800P cards. The X100M module allows the card to terminate four analog telephone lines (POTS) per module. Because of the modular design of these cards, users can activate additional ports at any time with more S400M or X400M daughter cards. The X400M module passes all the call features any standard analog telephone line will support.
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