ZyXEL Elite 2864I User Guide - Page 22

Additional specific features ISDN Ready or Upgradeable The 2864I model has an ISDN module to connect to an ISDN line. On the other 2864 models the phone line interface module may be removed and replaced instead by an ISDN module to become an ISDN modem. The ISDN modem has both ISDN capability and normal modem/fax/voice capability. For ISDN capability, the 2864I supports a 2B+D ISDN basic rate interface. On the B channel, the 2864I supports one B channel at 64Kbps or two B channels bundled at 128Kbps. With data compression, the throughput is up to a few hundred Kbps. The 2864I also supports one B channel for data and the other B channel for voice communication. On the D channel, the 2864I supports 1TR6 protocol for German ISDN, DSS1 protocol for Euro ISDN and NI1, AT&T 5ESS and Northern Telecom DMS-100 for North America ISDN. A full feature analog port (a/b adapter) is provided. Thus, a regular telephone equipment may be connected to the ISDN line to make and receive ISDN calls through this port. The metering pulse is also supported on this analog port for countries supporting it. For modem/fax/voice capability, the 2864I can initiate and receive modem/fax calls to/from a modem or fax machine connected to a PSTN analog telephone line. Voice mail capability is also supported for voice calls to/from an ISDN or analog PSTN line. Voice Playback and Recording A normal telephone set may be connected to the phone jack of the modem for local voice message playback or recording. The modem provides the necessary DC voltage and current for the telephone set to operate. A microphone and a speaker jack are also provided for voice recording or playback. An external microphone, speakers or a headset may be connected to the modem through these jacks. A large and good quality internal speaker is installed to provide better sound for voice and music playback. Telephony Capability The 2864 series modem can detect the on/off-hook status or polarity change of the phone line connection and the attached telephone set. These will be reported as events in voice mode to the connected computer. The modem can also control and switch between telephone connecting to line and modem connecting to line. It can 1-6