N0023532 Page 1 of 5 Standard 2.00Accessory Connection Module Installation GuideThis document describes how to install the Accessory Connection Module (ACM) (NTMN71xx). The ACM is anoptional hardware module that you install into the telephone footstand. The ACM provides a port, or ports, to connectthe accessory cartridge interface.The M3902 has one accessory port. The M3903, M3904, and M3905 have two accessory ports.Note: The M3901 does not support the ACM.The plug-in cartridge allows the M3900 Series Digital Telephones to use the following accessories:• Meridian External Alerter and Recording Interface (MEARI)• Personal Directory PC Utility (M3904 and M3905)• Full Duplex Handsfree (FDHF) cartridge (M3904 Phase III only)• Analog Terminal Adapter (ATA)• Computer Telephony Integration Adapter (CTIA)Note: The Meridian SL-100 does not support the CTIA.Figure 1: Accessory Connection Module (ACM)553-8967ACMFootstand ACM ribbon cableRectangularopening forACM InstallationTelephone and footstand