Data Sheet
July 2001
L9311 Line Interface and Line Access Circuit Full-Feature SLIC with
High Longitudinal Balance, Ringing Relay, and GR-909 Test Access
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 pin-
for-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.
Applications
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Pair Gain
Digital Loop Carrier (DLC)
Central Office (CO)
Fiber-in-the-Loop (FITL)
Description
The L9311 electronic line interface and line access
circuit (LILAC) provides all the functions that are nec-
essary to interface a codec to the tip and ring of a
subscriber loop, integrating the battery feed and ring-
ing access relay and line test access in one low-
power, low-cost package.
The L9311 requires a 5 V and battery supply to oper-
ate. Included is an automatic battery switch. The bat-
tery feed offers forward and reverse battery, on-hook
transmission, and ground start operational modes. It
also has a low-power scan and a disconnect mode.
In all operating states, this IC is designed for minimal
power dissipation. This device is designed to mini-
mize the number of external components required at
all interfaces.
The dc template, current limit, and overhead voltage
and loop supervision threshold are programmable via
an applied voltage source. The voltage source may
be an external programmable voltage source or
derived from the V
REF
SLIC output.
The integrated solid-state switch offers power ringing
access. Impulse noise is minimized, thus eliminating
the need for external zero-cross switching circuitry.
The L9311 provides line test capability, consistent
with GR-909 requirements. The differential or single-
ended ac and dc line voltage or current may be mea-
sured by the L9311.
Features
SLIC
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5 V and battery operation
Optional automatic battery switch
13 operational and test modes
Appropriate for 58 dB longitudinal balance applica-
tions
Minimal external components required at all inter-
faces
Ultralow power dissipation
Software/hardware adjustable dc parameters and
supervision thresholds
Ground start
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Solid-State Ring Relay
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Low impulse noise
Current-limited switches/thermal protection
Line Test Matrix
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GR-909 test capability
Single-ended or differential measurements
Current or voltage sense
ac or dc measurements
Dedicated analog input and output
AGERE [ AGERE SYSTEMS ]
