Nortel DMS-100 Series General Description Manual page 83

The following paragraphs describe the function of LCM hardware components
only as they relate to the LCM ringing system.
NT6X51 processor
The NT6X51 processor card schedules ringing and controls the relays on the
power converter card (NT6X53), the bus interface card (NT6X54), and the line
card. The relays operate in accordance with information from the DMS-100
CC and the ringing generator.
Note: The NT6X51 processor card exercises no control over the ringing
generator. The processor card controls only the relays that route the ringing
generator output. The ringing generator sends status bits to the processor
about ringing generator activity and condition.
NT6X30 ringing generator
Manually-set switches on the NT6X30 card select a pre-programmed
combination of ringing frequency, ringing signal amplitude and subcycle
cadence. Because these parameters are manually set, the ringing generators in
the LCE can provide only one type of ringing for each LCE. However, the
ringing generators can be set to any ringing scheme available.
The ringing generator also generates ANI/coin voltages to provide automatic
number identification and coin operations.
NT6X53 power converter
The primary function of the NT6X53 power converter card is to provide power
to a single LCM shelf; in the event of a power converter failure, the NT6X53
card is capable of supplying power to both shelves in the LCM. A secondary
function provided by the NT6X53 power converter is the selection of ringing
generator output. The ringing generator multiplexer relays allow either ringing
generator to provide ringing signals to all LSGs in each LCM if a ringing
generator fails. The operation of the ringing generator multiplexer for a ringing
generator switch is described in Section , "Ringing generator control" on page
3-14.
The NT6X53 power converters support the selection of ANI/coin functions
through a relay network controlled by the LCM processor. Relays on the power
converter can select one of four ANI/coin voltages provided by the ringing
generator. Current from ANI/coin sources is routed through a current detector
circuit, which sends information to the processor for functions such as the coin
presence test.
Note: Because of the ringing generator multiplex circuits, the LCM unit
must be manually busy (ManB) or system busy (SysB) before removing the
NT6X53 card.
Ringing in Series II peripherals 3-15
DMS-100 Ringing System