78P2244 Просмотр технического описания (PDF) - TDK Corporation
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78P2244 Datasheet PDF : 2 Pages
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DESCRIPTION
The 78P2244 is a quad channel version of the
78P2241. Each of the four channels is a complete line
interface transceiver for E3, DS3, STS-1, North
America T3 and ATM applications. Each channel
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. Each
transmitter has the 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 78P2244 is manufactured in an advanced
BiCMOS process and operates at both 3.3V and
5V power supply voltages.
BLOCK DIAGRAM
78P2244
Quad E3/DS3/STS-1
Transceiver
Advanced Product Notice
FEATURES
June 2000
• Quad channel transmit and receive interface
for E3, DS3 and STS-1 applications
• Interfaces 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
PULSE
SHAPER
Data
Slicer
Clock
Reco ver y
Adaptiv e
Equalizer
Signal
Detector
LOUTP
LOUTN
LINP
LINN
Port 1
Port 2
Port 3
Port 4
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