Introduction
The Agere Systems Inc. L9313 is a combination full-feature, ultralow-power SLIC, solid-state ringing access relay, and line test matrix. It is part of a pinfor-pin compatible family of devices designed to serve a wide variety of applications. The L9313 is optimized for TR-57 applications where forward and reverse battery and ground start are required.

Features
SLIC
■ 5 V and battery operation
■ Optional automatic battery switch
■ Seven operational modes
■ Appropriate for 58 dB longitudinal balance applications
■ Minimal external components required at all interfaces
■ Ultralow power dissipation
■ Software/hardware adjustable dc parameters and supervision thresholds
■ Ground start compatible

Solid-State Ring Relay
■ Low impulse noise
■ Current-limited switches/thermal protection

Applications
■ Pair Gain
■ Digital Loop Carrier (DLC)
■ Central Office (CO)
■ Fiber-in-the-Loop (FITL)