Advance Information
This document contains information on a product under development. The parametric information
contains target parameters that are subject to change.
CN8331/CN8332/CN8333
Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit
Distinguishing Features
The CN8333 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 CN8332 is a dual-channel, and the CN8331 is a
single-channel LIU with performance identical to the CN8333.
The CN8333 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.
•
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
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Programmable pulse filtering to meet
cross-connect pulse masks (ANSI
T1.102-1993)
Meets jitter specifications of Bellcore
GR499 and GR253
•
•
Large input dynamic range
Alarms for coding violation and loss
of signal
•
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Full diagnostic loopback capability
Uses a minimum of external
components
NOTE: In this document "x" is used to represent the number of channels:
x = 1 (CN8331), x = 2 (CN8332), and x = 3 (CN8333).
•
•
Compatible with ITU-T G.703, G.823
Independent power down mode per
channel
Functional Block Diagram (only one Channel is shown)
•
Easily interfaced to the DS3/E3
Framer IC (CN8342/3/4/6/8 and
CN8330)
Selectable B3ZS/HDB3
encoding/decoding
XOE
LBO
E3MODE
•
•
PDB
Superior input receiver sensitivity
(< 25mV)
TPOS
TLINEP
Pulse
Shaper
LINE
DRIVER
TNEG
TCLK
Physical Characteristics
ENCODER
TLINEM
•
•
•
80-pin ETQFP package
Single 3.3 V power supply
1 W maximum power dissipation
(CN8333)
TCLK
TAIS
•
•
•
–40 °C to +85 °C temperature range
5 V-tolerant pins
TTL digital pins
RLOOP
LLOOP
DATA
MUX
REFCLK
Applications
RPOS
RNEG
RCLK
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•
•
•
•
•
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Digital Cross Connect Systems
Routers
ATM Switches
Channelized Line Aggregation Units
Test Equipment
Channel Service Units
Multiplexers
PDATA
P
N
RLINEP
RLINEM
Clock/
Data
Recovery
Receiver
NDATA
DECODER
DATCLK
ALOS
RLOS
REQH
Data Sheet
100604B
March 23, 2000