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Tip Ring Line (ZTN78)
The Tip Ring Line Circuit Pack interfaces eight analog tip and ring voice terminal lines
(single-line voice terminals) and the TDM bus.
Figure 3-10 shows the following Tip and Ring
Line unique circuitry:
●
Ringing application circuit
●
Port Input/Output (I/O) circuit
● Eight port circuits.
NPE O
NPE 1
\
PORT
I/O
●
CIRCUIT
ON-BOARD
MICRO-
PROCESSOR
●
ELECTRONIC
CODEC
HYBRID
BATTERY
FEED
●
❘
T.O
❘
❘
R.O
❘
T.3
PORT
CIRCUIT
3
R.3
●
●
RINGING
APPLICATION
CIRCUIT
PORT
CIRCUIT
0
●
●
●
●
POWER
SUPPLY
❘
●
❘
❘
–48V TO –24V
POWER
CONDITIONER
T.4
PORT
CIRCUIT
4
R.4
T.7
PORT
CIRCUIT
7
R.7
TO
ANALOG
TIP/RING
TERMINALS
●
/
Figure 3-10. Unique Tip Ring Line (ZTN78) Circuitry
3-20