Introduction
The Agere Systems Inc. L9311 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 L9311 is optimized for North American access applications where TR-57 longitudinal balance and GR-909 line test are required.

FEATUREs
SLIC
■ 5 V and battery operation
■ Optional automatic battery switch
■ 13 operational and test 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

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

Line Test Matrix
■ GR-909 test capability
■ Single-ended or differential measurements
■ Current or voltage sense
■ ac or dc measurements
■ Dedicated analog input and output

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