Specifications

System Overview 29
• Performs the analysis half of the speech recognition system.
• Performs the analysis half of call progress detection.
• Controls the telephone line interface.
• Generates tone dialing.
Q-bus Interface
The Q-bus interface consists of a slave section and a memory interface
section. The slave section contains the control and status register and
sends interrupts to the host. The memory interface section provides
communication between the Q-bus and module.
2.3.2 TLI Assembly
The TLI assembly is functionally divided into two halves. One half
controls communication with the telephone network. The other half
controls communication with the DTC04 voice module. The heart of the
TLI is the Intel 29C50 Subscriber Line Datalink chip. This chip uses the
Intel SLD protocol to control communication between the DTC04 module
and the telephone network.
Communication with the Telephone Network
The half of the TLI that controls communication with the telephone
network is divided into five functional blocks.
• Protective circuitry that protects TLI from power surges over the
phone line and conforms to the specifications of FCC Part 68
• Ring detection logic
• Wink detection logic (detection of line current when the phone is off
the hook)
• Hook control logic
• Analog path