CX28333 Datasheet, PDF (1/68 Pages) Conexant Systems, Inc – Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit

Advance Information
This document contains information on a product under development. The parametric information
contains target parameters that are subject to change.
CX28331/CX28332/CX28333
Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit
The CX28333 is a three-channel, E3/DS3/STS-1 fully-integrated Line Interface Unit
(LIU). It is configured via external pins and does not need a microprocessor interface.
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 that the cross-connect pulse mask requirement is met for transmit
cable length up to 450 feet. The CX28332 is a dual-channel, and the CX28331 is a
single-channel LIU with performance identical to the CX28333.
The CX28333 gives the user new economies of scale in concentrator applications
where three DS3 or STS-1 channels are concentrated into a single STS-3 channel. By
including three independent transceivers on a chip, significant external components are
eliminated, with the exception of 1:1 coupling transformers, termination resistors, and
supply bypass capacitors.
NOTE: In this document, "i" is used to represent the number of channels:
i = 1 (CX28331), i = 2 (CX28332), and i = 3 (CX28333).
Functional Block Diagram
XOE
LBO
E3MODE
PDB
TPOS
TNEG
TCLK
TAIS
RLOOP
LLOOP
RPOS
RNEG
RCLK
RLOS
PDATA/
NDATA
ENCODER
TCLK
Pulse
Shaper
DATA
MUX
LINE
DRIVER
TX
Monitor
DECODER
PDATA
NDATA
Clock/
Data
DATCLK _Recovery
P
N Receiver
ALOS
TLINEP
TLINEM/N
TMONP
TMONM
TXMON
TMONTST
REFCLK
RLINEP
RLINEM/N
REQH
LIU #1
LIU #2
LIU #3
Distinguishing Features
• Can be used as a data transceiver
over a maximum of 900 feet of Type
734/728 coaxial cable or equivalent
in an on-premise environment
• Programmable pulse filtering to meet
cross-connect pulse masks (ANSI
T1.102-1993)
• Meets jitter specifications of Bellcore
GR499, GR253, and TBR24 (with
external JAT).
• Large input dynamic range
• Alarms for coding violation and loss
of signal
• Full diagnostic loopback capability
• Uses a minimum of external
components
• Compatible with ITU-T G.703, G.823
• Independent power down mode per
channel
• Easily interfaced to the DS3/E3
Framer IC (CX28342/3/4/6/8 and
CN8330)
• Selectable B3ZS/HDB3
encoding/decoding
• Superior input receiver sensitivity
(< 25 mV)
• Transmit monitor inputs (CX2833i-3x
series only)
Physical Characteristics
• 80- and 100-pin ETQFP package
• Single 3.3 V power supply
• 1 W maximum power dissipation
(CX28333)
• –40 °C to +85 °C temperature range
• 5 V-tolerant pins
• TTL digital pins
Applications
• Digital Cross-Connect Systems
• Routers
• ATM Switches
• Channelized Line Aggregation Units
• Test Equipment
• Channel Service Units
• Multiplexers
NOTE(S): The TX Monitor is only used with the 100-pin CX2833i-3X.
Data Sheet
100985A
June 2, 2000