TDK Semiconductor Corporation 78P7200, 78P2243 Datasheet

DESCRIPTION

78P2243

Triple E3/DS3/STS-1

Transceiver

Advanced Product Notice

June 2000

FEATURES

The 78P2243 is a triple channel version of the
78P2241. Each of the three ports is a line interface
transceiver for E3, DS3, STS-1, North America T3 and
ATM applications. It includes clock recovery and
transmitter pulse shaping functions for applications
using 75-ohm coaxial cable at distances up to 1100
feet. These applications include DSLAMs, T3/E3 digital
multiplexers, SONET Add/Drop multiplexers, PDH
equipment, DS3 to Fiber optic and microwave modems
and ATM WAN access for routers and switches.

Each receiver recovers clock and data from a B3ZS or
HDB3-coded AMI signal. The receiver can compensate
for over 12dB of cable and 6dB of flat loss. The
transmitter has a B3ZS/HDB3 ENDEC with a receive
line code violation detector, a loop-back mode, a clock
polarity selection mode, and the ability to receive a
DSX3 monitor signal. Signals generated meet the
standard pulse shape requirements.

The 78P2243 is manufactured in an advanced
BiCMOS process and operates at both 3.3V and 5V
power supply voltages.

BLOCK DIAGRAM

• Triple channel transmit and receive interface

for E3, DS3 and STS-1 applications

• Interface to 75 ohm coaxial cable over 1100

feet at speeds up to 51.84 Mbit/s

• Compliant with ANSI T1.102-1993, Telcordia GR-499-

CORE and GR-253-CORE, ITU-T G.703, G.823 and
G.824 for jitter tolerance and G.775 for loss of signal

• Compliant with ATM FORUM af-phy-0034 (E3

public UNI) and af-phy-0054 (DS3 public UNI)

• Easily Interfaced to ATM framer ICs such as

PMC-Sierra 7345 , and 7346 QJET

• Receive DS3-high and DSX3 monitor signals

• Diagnostic loop-back for AMI and digital signals

• Selectable B3ZS/HDB3 ENDEC

• Receive Line Code Violation Detector

• 128-lead TQFP package

• 3.3V or 5V operation

• Input circuit works transformer or AC coupled

TPOS/TNRZ

TNEG

TCLK

RPOS/RNRZ

RNEG/RLCV

RCLK

PWDN

ENDEC

B3ZS/
HDB3

Encoder

ENDEC

B3ZS/

HDB3

Decoder

Biasing

DLPBK

Data

Slicer

Clock

Recovery

LF

LBO

PULSE

SHAPER

Signal from

RXLPBK

Adjacent Port

Adaptive

Equalizer

Signal

Detector

LOS

TXEN

MON

LOUTP
LOUTN

LINP
LINN

Port 1

Port 2

Port 3

78P2243
Triple E3/DS3/STS-1
Transceiver

DESCRIPTION (continued)

The 78P2243 contains all the necessary transmit and
receive circuitry for connection between E3, DS3, or
STS-1 signals and digital Framer/ Deframer ICs.

OPERATING RATE

The DS3 and E3 pins determine which mode the
chip operates in according to the table below. They
control the PLL center frequency, the equalizer
response, the transmitter pulse shape, and the
transmitter amplitude.

Standard DS3 PIN E3 PIN

E3 Low High
DS3 High Low
STS-1 Low Low
STS-1 High High

B3ZS/HDB3 ENDEC with Line Code Violation
Detect

The 78P2243 includes a selectable B3ZS/HDB3
Encoder/Decoder (ENDEC). When the ENDEC pin
is low, the ENDEC is selected and the decoder
generates a composite NRZ logic data stream
following the B3ZS (for DS3/STS-1) or HDB3 (for E3)
substitution codes via the RPOS/RNRZ pin as
shown below.

The decoder also detects Receive Line Code
Violations (RLCV) and outputs a pulse via the
RNEG/RLCV pin. Three different classes of line
code violations are detected.

1) Too many zeros: More than two (three)
consecutive zeros in B3ZS (HDB3) mode.

2) Not enough zeros between bipolar pulse (B)
and bipolar violation pulse (V): (B ,V) for B3ZS.
(B,V) or (B,0,V) for HDB3.

3) Code violation: Even number of bipolar pulses (B)
detected between bipolar violation pulses (V).

On the transmit side, when the ENDEC pin is low,
NRZ input data is encoded to Positive and Negative
logic data following the B3ZS (for DS3/STS-1) or
HDB3 (for E3) substitution codes. The NRZ data is
input to the TPOS/TNRZ pin as shown below.

ENDEC TPOS/TNRZ TNEG

High Positive AMI Negative AMI

Low NRZ data No Connect

ENDEC RPOS/RNRZ RNEG/RLCV

High Positive AMI Negative AMI

Low NRZ data Receive Line

Code Violation

Indicator

No responsibility is assumed by TDK Semiconductor Corporation for use of this product nor for any infringements of patents and trademarks
or other rights of third parties resulting from its use. No license is granted under any patents, patent rights or trademarks of TDK
Semiconductor Corporation and the company reserves the right to make changes in specifications at any time without notice. Accordingly, the
reader is cautioned to verify that the data sheet is current before placing orders.

TDK Semiconductor Corporation, 2642 Michelle Drive, Tustin, CA 92780-7019, [phone], FAX: [phone]

2000 TDK Semiconductor Corporation 06/01/00- rev. A

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