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The ESI IVX E2 DLC12 PC T1/PRI card is an add on module for ESI phone systems. The IVX E2 DLC12 PC T1 card provides a T1 or ISDN-PRI interface for connecting a digital circuit along with twelve additional digital extension ports for ESI digital feature phones. The E2 DLC 12 PC is the second generation version of the card, and includes a built in CSU for terminating the T1 circuit directly into the card.
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