206 TroubleshootingCompact Plus System Administration Guide P0607114 Issue 01Power-fail telephoneEach analogue line card, installed in either the Compact PlusCentral Control Unit (CCU) or a Line Module, provides onepower-fail telephone connection at the Box Connection.The power-fail telephone is an analogue telephone (not a Norstartelephone) that functions independently of the Compact Plussystem. You can use the power-fail telephone only when yourNorstar system is disconnected or without power. The power-failtelephone is usually located near the Compact Plus CCU. If thereis no power-fail telephone next to the CCU, plug a standardanalogue telephone into the power-fail telephone socket locatednear the CCU.The power-fail telephone facility is not supported on a BRI loop.Norstar customers with digital exchange lines who requirepower-fail telephones, have the following options:• Add analogue exchange lines to the system.• Install an uninterruptable power supply (UPS) stand-by powerunit for the Compact Plus.ATTENTION!power-fail lines not supportedThe following line cards do not support power-fail telephone lines:NTBB1202: LM with auto-ranging power supplyThese versions of LMs do not support emergency telephones.NTBB20AD-93 UK Class B LMNTBB20AE-93 Australia LMNTBB20FD-93 Eng/Fr LMNTBB20FF-93 Cala LMNTBB20FG-93 International LM
