Universal Remote DMS-100 Especificações descarregar pdf (Página 89)

Ringing in Series II peripherals 3-21

DMS-100 Ringing System

ANI/coin signals

ANI/coin signals are transmitted from the NT6X53 on a two-wire bus, but,

unlike bridged ringing signals, they are not returned in the loop. Instead

ANI/coin signals are directed to ground at the subscriber premises and current

is recovered at the ground window of the central ofﬁce. ANI/coin signals may

be applied to both tip and ring together or just to the tip lead.

Automatic number identiﬁcation is a system whereby a calling number is

identiﬁed automatically and transmitted to the automatic message accounting

(AMA) ofﬁce equipment for billing. The ringing generator provides four

voltages for ANI/coin functions. The ANI function uses +48 V and -48 V to

identify individual parties on a party line of up to four parties. Coin phones use

+130 V to indicate coin collect operations, -130 V to indicate coin return, and

-48 V for a coin presence test.

As shown in Figure 3-6, "Detailed ringing schematic" on page 3-18 the

ringing system supports separate ringing and ANI/coin buses from the ringing

generator to the line drawers. However, at the drawer level, only one bus is

used to send either ANI/coin or ringing signals to the line drawers. Unlike

ringing signals, ANI/coin signals from both ringing generators are not

selectable within the NT6X53 power converter. Ringing generator 0 provides

ANI/coin voltages for LCM unit 0, and ringing generator 1 provides ANI/coin

voltages for LCM unit 1. If a failure occurs in the ANI/coin circuitry on the

ringing generator, the LCM unit it serves enters a system-busy state, forcing

the remaining LCM unit to go into takeover mode. The unit in takeover now

supplies ANI/coin and ringing signals to all drawers in the LCM.

Relay K1 on the power converter selects between positive and negative

voltages; this function is driven by the SPOL (select polarity) control signal

shown in the ﬁgure "Status and control bits for LCM ringing". Relay K2

selects between 48 V dc and 130 V dc and is driven by control signal SVOLT

(select voltage) shown in the Figure 3-7, "Status and control bits for LCM

ringing" on page 3-20 Relay K3 (SCOIN control signal in Figure 3-7, "Status

and control bits for LCM ringing.") selects between applying voltage on the tip

and ring leads together or only on the tip lead. For 48 V selections, a tip-only

application is provided through resistor R49.

As shown in Figure 3-6, "Detailed ringing schematic" on page 3-18 all current

from ANI/coin sources is routed through a current detector. This circuit sends

a signal to the NT6X51 processor card indicating either the presence or

absence of current on the ANI/coin bus. This method is used by the processor

to make decisions about coin presence tests and automatic number

identiﬁcation.

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Universal Remote DMS-100 Especificações Página 89