28333-BRF-001-A_15 Datasheet, PDF (1/4 Pages) M/A-COM Technology Solutions, Inc. – DS3/E3/STS-1 Line lnterface Unit

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A CONEXANT BUSINESS
DS3/E3/STS-1 Line lnterface Unit
CX28333/28332/28331
Complete Single-Chip, Multiport Line
Interface Units
The CX28333/28332/28331 line interface units (LIUs)
from Mindspeed Technologies’^™ provide data transceiver
capability over coaxial cable up to 900 feet in an on-
premises environment. The use of programmable pulse
filtering in each independent transmit section simplifies
system implementation by ensuring full compliance with
ANSI T1.102-1993 cross-connect pulse-mask standards.
Independent on-chip band-gap references are included
to enable precise pulse-shape generation. The large
receiver, dynamic range, and minimal requirement for
external components reduce the cost and complexity of
test and monitoring functions in a typical DS3 or E3
front-end design.
The receiver sections for each port of the CX28332 and
CX28333 are completely separate and feature automatic
gain control provided by a variable gain amplifier, clock
recovery phase-locked loop (PLL), receive equalizer
and signal slicer. The sophisticated receive equalizer
recovers the signal attenuated by several different
cable types (such as types 734 and 728) as well as “flat
loss” introduced by many in-service testing and redun-
dant cabling configurations. These line interfaces are
intended to meet all applicable requirements for DS3/E3
and STS-1 data rates. Current ANSI, ETSI, ITU-T and
Bellcore standards are supported.
> KEY FEATURES
> Receive equalizer requires
no user configuration
> Programmable pulse
filtering to meet cross-
connect pulse mask
standards (ANSI
T1.102-1993)
> Meets jitter specifications
of Bellcore GR-499 and
GR-253
> Large input dynamic range
> Full-loopback capability
Integrated Alarms and Maintenance
The CX28333, CX28332 and CX28331 feature alarms
for coding violations and loss of signal, a built-in
B3ZS/HDB3 encoder/ decoder, and full-loopback
capability. On-chip facilities for network management
and testing eliminate the need for external circuitry.
Many external components have been eliminated, with
the exception of coupling transformers, termination
resistors and supply bypass capacitors. The devices
meet interoperability requirements as defined by the
Bellcore GR-499 and GR-253 jitter specifications.
Each channel has an independent equalizer on the receive
side, requiring no user configuration. Also, each channel
has a programmable transmit pulse shaper that can be
set to ensure the cross-connect pulse mask requirement
is met for transmit cable lengths of up to 450 feet.
Superior input receiver sensitivity allows for a minimum
25 mV receive level.
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