Check the listing for details. Avaya Lucent Definity TN754B 4 Wire DCP Digital Line Card Module Circuit Pack. Condition: Used. Listed at 12.95 USD. Avaya Lucent 4 Wire Digital Circuit Pack Model Number: TN754B This is a used card, pulled from a decommissioned Avaya PBX cabinet. TN754B Features - Provides 8 asynchronous, 4-wire DCP ports. - Connect to 7400 series and 8400 series digital voice terminals, attendant consoles, or data modules. - TN754B supports 8400 series data module types. - TN754B does NOT support group paging. Free domestic shipping via the United States Postal Service. International shipping will be via USPS Priority International, or the GSP. Feedback will be left automatically by the system upon you leaving feedback for us. Please be sure to ask any and all questions BEFORE making your purchase. Any and all returns are subject to a 20% restocking fee.