78P2351
Single Channel
OC-3/ STM1-E/ E4 LIU
PRELIMINARY DATASHEET
FEBRUARY 2004
DESCRIPTION
The 78P2351 is TDK’s second generation Line
Interface Unit (LIU) for 155 Mbit/s SDH/SONET (OC-
3, STS-3, or STM-1) and 140Mbit/s PDH (E4)
applications. The device is a single chip solution
that includes an integrated CDR in the transmit path
for flexible NRZ to CMI conversion. The device can
interface to 75Ω coaxial cable using CMI coding or
directly to a fiber optics module using NRZ coding.
The 78P2351 is compliant with all respective ANSI,
ITU-T, and Telcordia standards for jitter tolerance,
generation, and transfer.
APPLICATIONS
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Central Office Interconnects
DSLAMs
Add Drop Multiplexers (ADMs)
PDH/SDH test equipment
Multi Service Switches
FEATURES
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G.703 compliant, adjustable cable driver for
139.264 Mbps or 155.52 Mbps CMI-coded coax
transmission
Integrated adaptive CMI equalizer and CDR in
receive path handles over 15dB of cable loss
Serial, LVPECL-compatible system interface
with integrated CDR in transmit path for flexible
NRZ to CMI conversion.
4-bit parallel CMOS system interface with
master/slave Tx clock modes.
Selectable LVPECL compatible NRZ line
interface for 155.52 Mbps optical transmission.
Configurable via HW control pins or 4-wire serial
port interface
Optional fixed backplane equalizer compensates
for up to 1.5m of trace
Compliant with ANSI T1.105.03-1994; ITU-T
G.751, G.813, G.823, G.825, G.958; and
Telcordia GR-253-CORE for jitter performance.
Loss of Lock (LOL) and standards compliant
Loss of Signal (LOS) detection.
Receive Monitor Mode handles up to 20dB of
flat loss (at max 6dB cable loss)
Operates from a single 3.3V supply
100-pin JEDEC LQFP
BLOCK DIAGRAM
Lock Detect
ECLP/N
SIDP/N
SICKP/N
PICK
PI[3:0]D
PTOCK
Tx CDR
FIFO
CMI
Encoder
TXCKP/N
CMI2P/N
CMIP/N
PMOD, SMOD[1:0], PAR
RLBK,
RDSL
SOCKP/N
SODP/N
PO[3:0]D
POCK
CMI
Decoder
Rx CDR
Lock Detect
CMI
Adaptive
Eq.
RXP/N
LOS Detect
LLBK
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TERIDIAN [ TERIDIAN SEMICONDUCTOR CORPORATION ]
