Section 700 - Operation Chapter 3. System FeaturesICX-35-700 ICX (International), issued March/1998 25Background Music/MOH SeparationDescriptionSeparate inputs are provided for Background Music and Music-on-Hold (MOH). This allows onemusic or sound source to be used for background music and another music or sound source to be usedfor music on hold.A typical advantage of this is playing a pre-recorded promotional tape to held parties (since manymay be customers) while providing a selected background music for use in the office.Hardware Requirements• Background music requires an SCC card (VB-44181). Both Background Music and MOH (ifusing external MOH) require a sound source.Considerations• N/ABattery BackupDescriptionWhen backup batteries are installed, the System will continue to operate in the event of a powerfailure. If using Battery Backup, backup batteries must be installed in each CCU.A fully loaded system will operate at least 30 minutes on backup batteries.Hardware Requirements• Back-up battery unit (VB-44025)Considerations• Any device connected to the System but that does not derive its power from the System musthave a backup power source to operate. These devices include any System Message DetailRecording (SMDR) (Call Logging) printer (or recorder), fax machine, answering machine,modem, cordless telephone, etc.Building Block Expansion CapabilityDescriptionThe System is designed to support easy expansion. Each CCU in the System supports 96 ports (12flexible slots) as well as 2 option slots. Up to 6 CCUs may be installed in the System for a total of 576ports.Up to 2 expansion CCUs may be connected to a base CCU. When a fourth CCU is required, anotherbase CCU is installed. Up to 2 expansion CCUs may be connected to the second base CCU.This building block approach allows you to easily add equipment when needed without a majorinterruption in service or a major delay.