22 CHAPTER 1: INTRODUCTIONSuperStack 3 NBXCore ComponentsThe core components are the Call Processor and one or more Gatewaychassis.SuperStack 3 NBX CallProcessorThe SuperStack 3 NBX Call Processor (Figure 1) contains the systempower supplies, cooling fans, and one disk drive. Optionally, you can adda second “mirrored” disk drive. (Disk mirroring is described in the NBXAdministrator’s Guide in the NBX NetSet™ utility, on the NBX ResourcePack CD, or on the 3Com Partner Access web site.)The Call Processor manages call traffic, voice mail, and the AutomatedAttendant. It can be licensed for up to 1500 devices. See “SystemConfiguration Guidelines” on page 47 for more information on the totalnumber of supported devices.A SuperStack 3 NBX system is available in these base models:■ With a single power supply and licensed for 250 devices■ With redundant power supplies and licensed for 250 devicesCAUTION: Each of the two power supply units in the redundant modelhas its own overcurrent protection device. That is, the overcurrent devicefor one power supply does not protect the second power supply. Youmust connect two AC power cords to the unit to power both of thepower supplies.A SuperStack 3 NBX system includes these features:■ Supports the Telephony Application Programming Interface (TAPI) 2.Xfor Computer Telephony Integration (CTI) applications■ Includes a web server to support the NBX NetSet administration utility■ Includes an Internet Message Access Protocol (IMAP4) message serverfor integration of voice mail and e-mailThe SuperStack 3 NBX Call Processor has these connectors and LEDs,shown in Figure 1:■ VOL — This adjusting screw controls the volume of Music On Hold.■ MOH — This mini-jack (mono or stereo) accepts music-on-hold audiofrom the line output of a CD player, tape player, or other music source.■ PAGING — This RJ-11 connector provides an audio output or a drycontact switch connection for use with a public address system.
