ESI 5000-0419 Communications Server 684 PC Card (Refurbished)Key Features: Mnfr Part #: 5000 0419 CS 684 Connects up to six analog loop start CO lines, eight Digital Feature Phones and four analog station ports The CO line ports support standard CO and Centrex loop start lines (but not ground start CO lines) The analog ports provide a standard 24 volt, two wire connection to fax machines, courtesy phones, modems, etc Only one device can be connected to each analog station port This card uses 12 station ports