ETC 78P234X

DS3 / E3 / STS-1 Line Interface
U n i t w i t h J i t t e r A t t e n u a t o r.
7 8 P 2 3 4 2 J AT ( d u a l )
7 8 P 2 3 4 3 J AT ( t r i p l e )
7 8 P 2 3 4 4 J AT ( q u a d )
T h e F r o n t E n d o f B r o a d b a n d Te c h n o l o g y
78P234xJAT
FEATURES
– Transformer or AC-coupled
with capacitors
– Standards-based LOS
function
The 78P234xJAT is TDK Semiconductor’s next generation of Line Interface Unit
with integrated Jitter Attenuator. It is designed and manufactured in state of the
art CMOS process technology, delivering per port the industry's lowest power
consumption line interface transceiver to the market. These devices provide the
greatest flexibility, and offer lower cost solution to the network system designer.
– Optional serial-port based
mode selection and channel
status monitoring
– Receiver AGC corrects for up
to 6dB of flat loss
– Adaptive digital clock
recovery (requires line-rate
precision reference clock
input)
– Receive output clock
maintains nominal line-rate
frequency at all times
– Fully integrated Jitter
Attenuation function provided
for all line rates (no external
VCXO required)
– Jitter Attenuator configurable
for transmit or receive path
PRODUCT DESCRIPTION
The 78P234xJAT is a low-power,
2/3/4-port DS3/E3/STS1 transceiver
IC with integrated Jitter Attenuator
(JAT). It includes clock recovery and
transmitter pulse shaping functions for
applications using 75-ohm coaxial
cable at distances up to 1200 feet long
end-to-end or up to 750ft long from a
DS3 cross connect.
The receiver recovers clock and data
from a B3ZS or HDB3 coded AMI
signal. It can compensate for over
12dB of cable and 6dB of flat loss. The
transmitter generates a signal that
meets the standard pulse shape
requirements. It has a selectable
B3ZS/HDB3 ENDEC with a receive
line code violation detector, a local and
remote loop-back mode, an input
STANDARDS
– Compliant with ANSI T1.102-1993,
Telcordia GR-499-CORE and GR253-CORE, ITU-T G.703, G.823
and G.824 for jitter tolerance and
G.775 for loss of signal
– Compliant with ATM FORUM afphy-0034 (E3 public UNI) and afphy-0054 (DS3 public UNI)
– Compliant with TBR-24 1997 for E3
jitter transfer
Block Diagram
– Transmit line fault monitor
– Requires no external currentsetting resistor or loop filter
components
– Single 3.3V supply operation
receive MUX that can select a
redundant channel, a clock polarity
selection mode, and the ability to
receive a DSX3 monitor signal.
Controls Flags
LBO E3 DS3
DLBK
TXEN
TPOS
B3ZS /
HDB3
Encoder
TNEG
TCLK
– Available in 100TQFP
RPOS
RCLK
TXNW
LOUTP
Pulse
Shaper
Jitter
Attenuator
RNEG
Transmit
Monitor
LOUTN
Attenuator
ENDEC
B3ZS /
HDB3
Decoder
Data
Detector
AGC
Adaptive
Equalizer
LINP
LINN
MON
TCLKP
RCLKP
Power
Distribution
Signal
Detector
Clock
Recovery
LOS
RLBKA
RLBKB
PDTX PDRX
CKREF
Signals from
Adjacent Port
Port 1
CS
SCK
SDI
SDO
Control
Registers
Master
Bias
Generator
CKREF
Port 2
Port 3
Port 4
APPLICATIONS
Contact TDK Semiconductor for
the latest product information, to
find a local sales representative,
or to order a 2002 DATA ROM:
– DSLAMs
– T3/E3 digital multiplexers
– SONET Add/Drop multiplexers
support@tdksemiconductor.com
www.tdksemiconductor.com
Telephone: 714-508-8800
Fax: 714-508-8875
– PDH equipment
– DS3 to Fiber optic and microwave modems
– ATM WAN access for routers and switches
A low cost non-JAT version is available with the same features as
above. The 78P2344/43/42 devices are available in 100-pin
TQFP providing an easy upgrade path to 78P234xJAT.
DS3/E3/STS-1 CMOS QUAD LIU
INTERFERING TONE TEST
Figure 1 Input Eye with 9dB SNR
Figure 2 Recovered Eye with 9dB SNR
Figure 1: shows the input eye when 9dB of Signal to Noise Ratio (SNR) is injected. The device is expected to
still recover data when this amount of noise has been injected into the input.
Figure 2: shows the recovered eye and demonstrates the ability of the device to reject the incoming noise and
recovered the data.
PRODUCT BRIEF: This product brief is provided to describe certain component. Although TDK SEMICONDUCTOR CORP. strives for
accuracy in all its publications, this material may contain errors or omissions and is subject to change without notice. This product
brief is provided as is and without any express or implied warranties, including merchantability, fitness for a particular purpose and
non-infringement.
TDK Semiconductor Corp., 2642 Michelle Dr., Tustin, CA 92780
TEL (714) 508-8800, FAX (714) 508-8877, http://www.tdksemiconductor.com
© 2002 TDK Semiconductor Corporation
05/30/02 - rev 1.0