Nortel DMS-100 Series General Description Manual

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Nortel DMS-100 Series General Description Manual Manual pdf 82 page image

3-14 Ringing in Series II peripherals297-1001-131 Standard 06.01 October 2000Ringing generator controlThe LCM is provisioned with two ringing generators. Each unit of the LCMcan connect to either ringing generator. The SWRG command available at theMAP terminal switches a unit or both units from one ringing generator to theother.LCM processors monitor status bits from the ringing generators. If a problemis detected, system software attempts to resolve any trouble condition by avariety of methods including switching ringing generators.Ringing generator capacityThe LCM continuously monitors the output current of the ringing generatorsand reacts when the current exceeds a predetermined threshold. The number oflines that the ringing generator can ring simultaneously is not restricted to afixed value. The actual number depends on the number of ringers attached toeach line and the length of the subscriber loop.Types of ringing supportedThe LCM support the following types of ringing:• 20 Hz single party• superimposed ringing• frequency selective ringing• coded ringing• distinctive ringing• teen ringingNote: 20 Hz single party ringing, distinctive ringing and teen ringing arepatterns applied by the software to a particular output of the ring generator.Frequency selective ringing, coded ringing and superimposed ringing areaddressed through switch settings.Ringing configurationThe LCM ringing system consists of the following components:• LCM processor card (NT6X51)• ringing generator (located on NT6X30)• ringing amplifier (located on NT6X30)• power converter (NT6X53)• bus interface controller (NT6X54)• digroup controller (NT6X52)• line card