Universal Remote DMS-100 Especificações descarregar pdf (Página 87)

Ringing in Series II peripherals 3-19

DMS-100 Ringing System

Ringing signals

Ringing and ANI/coin voltages enter the LCM through the NT6X53 power

converter. Relays on the power converter provide a control function for ringing

that is completely independent of the power supply function. Relay K4 on the

NT6X53 power converter selects between the ringing voltages provided by the

two ringing generators (see Figure 3-6, "Detailed ringing schematic."). The

SRG (select ringing generator) control signal shown in ﬁgure "Status and

control bits for LCM ringing" drives this function.

When an LCM unit is in-service, relays K5 and K9 on the NT6X53 power

converter and relays K6 and K10 on the power converter in the mate unit are

activated. This operation is driven by the PWRACT (power activity) control

signal. Activation of these relays connects the in-service unit to its own ring

and ANI/coin buses and disconnects the mate unit from these buses (the

disconnect function is performed by the MPWACT control signal shown in

Figure 3-7, "Status and control bits for LCM ringing" on page 3-20). If,

however, the mate unit is busy, the in-service unit is connected to both its own

ring and ANI/coin buses and those belonging to its mate.

Each NT6X54 BIC has two sets of relays, one for each LCM unit, used to

control the ring bus for a single logical drawer. Relay K4 on the BIC selects

between ringing and ANI/coin voltages for the odd-numbered logical drawer.

Relay K1 performs the same function for the even-numbered logical drawer.

Relays K5 and K2 are used to reverse the ring bus within the drawer; this

operation allows for tip-side ringing on NT6X17 line cards.

A ringing generator also sends status bits to the LCM processor card, NT6X51,

providing information about its activity and condition. These status bits are

described next and illustrated in Figure 3-7, "Status and control bits for LCM

ringing."

XOVER

The crossover bit is generated shortly before the waveform of the ringing

signal crosses zero. This event is used by the processor card (NT6X51) to time

the operation of ringing relays.

F1 and F0

These two binary bits together deﬁne which of four subcycles the ringing

generator is on. Some ringing schemes use different types of ringing during

each subcycle.

CUR

The current bit is normally high and goes low when the ringing generator load

exceeds a predetermined threshold. This occurrence indicates the ringing load

is approaching the ringing generator capacity for the ringing slots in progress.

1 2 ... 82 83 84 85 86 87 88 89 90 91 92 ... 133 134

Sem comentários

Universal Remote DMS-100 Especificações Página 87