Check the listing for details. TN2313AP DS1 Interface Refurbished. Condition: Seller refurbished. Listed at 34.95 USD. Interfaces a DS1 trunk to the switch backplaneCompatible with previous 24-channel DS1 circuit packs, including the TN464F (V19 and below), the TN2464 (V19 and below), and the TN767E DS1, except that it does not provide for packet adjunct capabilitiesSupports a variety of applications, including networking of Definity switches, international trunk types, video teleconferencing, and wideband data transmissionOn S8500, S8700, and S8710 Media Servers, this circuit pack does not directly support D-channel signaling and thus does not directly support ISDN-PRI connectivity. However, the TN767 circuit can indirectly support D-channel signaling provided that the central office supports nonfacility associated signaling (NFAS)Can be configured for 24-channel, 1.544 MbpsCan supply two 8-Khz reference signals to the switch backplane for options use by the tone/clock board in synchronizing the system clock to the received line clockThe TN23132AP is firmware downloadable We accept paypal and credit cards. We are AdComm Technologies LLC, We are located in Secaucus New Jersey.