Receive Voice Path - GE JungleMUX 86445-31 Technical Practice And Installation Manual

Sonet multiplexer

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The signal is connected to the input of uncommitted op-amp IN1 U14(20) in the

SLIC through resistor R35.

depends on the placement of jumpers J7, J8, J9 and J10.

Jumper J7 defines line impedance of 600 or 900 ohms; J8 selects whether the

impedance is resistive only or in series with a 2.1 µF capacitor; while J9 and J10

provide for the addition of more Network Build Out Capacitance (NBOC). This

series compromise network provides impedance matching and proper trans-

hybrid return for cancellation in COMBO balance filters.

U14(19) outputs the signal to the COMBO Transmit Amplifier U15(28). The PCM

filter in U15 passes signals between 300 and 3400 hertz and performs the A-D

conversion with µ-255 companding law. The encoded data is shifted out of

U15(18) to the Programmable Logic Gate Array U5(39).

U5 performs the logical "or-ing" of the data signal with various byte information

signals and outputs the data on U5(62,59) to the JVT shelf driver U7. The JVT

Interface J1(C14,A14) consists of a balanced RS-422 signal pair.

The unit receives its clock source from the JVT Clock through the input driver U9.

The JVT serial bus operates at 2.592 MHz.

The microprocessor provides the information to the PLGA, which conditions the

solid-state relay U11 across the bantam jack for bridging or splitting

configuration.