Instruction manual

FUNCTIONAL DESCRIPTION
●
Port I/O and Sanity Check Circuit
This circuit interfaces the on-board microprocessor to the port circuits and checks
the sanity status of the DSPS of the port circuit.
Tone Detector (TN748B)
The Tone Detector Circuit Pack provides four touch-tone receivers and two general purpose
tone receivers that detect appropriate system and network tones on the TDM bus. The Tone
Detector CP consists of the same common circuitry as the intelligent port circuits plus the
unique circuits shown in Figure 3-19. The system can have a maximum of two Tone
Detector CPs.
TDM
BUS
LEADS
CIRCUIT
PACK
ADDRESS
LEADS
Figure 3-19.
Tone Detector (TN748B)
●
Port I/O and Sanity Check Circuit
TOUCH-TONE
PORTS
GENERAL
PURPOSE
TONE
DETECTOR
PORTS
This circuit interfaces the on-board microprocessor to the port circuits and checks
the sanity status of the port circuits Digital Signal Processors (DSPs).
3-34