Analog Line (TN742)
The Analog Line Circuit Pack interfaces eight analog voice terminal lines and the TDM bus.
Figure 3-14 shows the following Analog Line unique circuitry:
● Ringing application circuit
● Port Input/Output (I/O) circuit
● Eight port circuits.
PORT
CIRCUIT
0
ELECTRONIC
CODEC
HYBRID
BATTERY
FEED
OVERVOLTAGE
PROTECTION
●
❘
T.O
\
❘
NPE 0
NPE 1
❘
R.0
/
●
❘
ON-BOARD
MICRO-
PROCESSOR
●
●
●
●
\
●
●
POWER
SUPPLY
PORT
I/O
CIRCUIT
RINGING
APPLICATION
CIRCUIT
T.3
PORT
CIRCUIT
3
R.3
T.4
PORT
CIRCUIT
4
R.4
TO
ANALOG
TIP/RING
VOICE
TERMINALS
❘
❘
❘
T.7
PORT
CIRCUIT
R.7
7
/
Figure 3-14. Unique Analog Line (TN742) Circuitry
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