The MT8920AE is a Subscriber Line Interface Circuit (SLIC) manufactured by Mitel Networks Corporation. It is designed to provide the necessary interface between a telephone line and telecommunications equipment. SLICs are essential components in telephone systems, PBXs, and other voice communication devices.

Applications:

• PBX systems
• Central office telephone exchanges
• Voice over IP (VoIP) gateways
• Customer Premises Equipment (CPE)
• Analog telephone adapters (ATAs)

Features:

• Battery feed and supervision
• Ringing generation
• Loop supervision
• Overvoltage protection
• Two-wire to four-wire hybrid
• Programmable parameters

Benefits:

• Provides a complete interface to telephone lines
• Enables reliable voice communication
• Protects equipment from overvoltage conditions
• Allows for customization of line parameters
• Compatible with various telephone standards
• Reduces system complexity

Technical Specifications:

The MT8920AE provides battery feed to the telephone line, ensuring proper operation of the telephone handset. It generates the ringing signal to alert the subscriber of an incoming call. Loop supervision monitors the status of the telephone line (on-hook or off-hook). Overvoltage protection safeguards the equipment from lightning strikes and other electrical surges. The two-wire to four-wire hybrid converts between the two-wire telephone line and the four-wire internal circuitry. Programmable parameters allow for customization of the SLIC to meet specific application requirements.

Specifically, the MT8920AE supports a battery voltage of -48V. It offers adjustable ringing frequencies and amplitudes. It also provides a variety of diagnostic features for monitoring line conditions. The device is typically packaged in a through-hole or surface-mount package. Mitel provides detailed application notes and technical documentation to facilitate the design process.