78P2352
Dual Channel
OC-3/ STM1-E/ E4 LIU
DATA SHEET
SEPTEMBER 2006
DESCRIPTION
FEATURES
The 78P2352 is Teridian’s second generation Line
Interface Unit (LIU) for 155 Mbps SDH/SONET
(OC-3, STS-3, or STM-1) and 140 Mbps PDH (E4)
telecom interfaces. The device is a dual channel,
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
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ITU-T G.703 compliant cable driver for 139.264
Mbps or 155.52 Mbps CMI-coded coax
transmission
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Integrated adaptive CMI equalizer and CDR in
receive path handles over 12.7dB of cable loss
Serial, LVPECL system interface with integrated
CRU in transmit path for flexible NRZ to CMI
conversion.
transceiver module using NRZ coding.
The
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4-bit parallel CMOS system interface with
master and slave Tx clock modes.
78P2352 is compliant with all respective ANSI, ITU-
T, and Telcordia standards for jitter tolerance,
generation, and transfer.
Selectable LVPECL compatible NRZ media
interface for 155.52 Mbps optical transmission.
Configurable via HW control pins or 4-wire serial
port interface
APPLICATIONS
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.
Receiver Loss of Signal (LOS) detection
compatible with ITU-T G.783
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Central Office Interconnects
DSLAMs
Add Drop Multiplexers (ADMs)
Multi Service Switches
Digital Microwave Radios
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Operates from a single 3.3V supply
Standard and thermally enhanced 128-pin
JEDEC LQFP package options
BLOCK DIAGRAM
EACH CHANNEL: Tx
Lock Detect
ECLxP/N
Tx CDR
SIxDP/N
TXxCKP/N
FIFO
CMI
Encoder
SIxCKP/N
CMIxP/N
PIxCK
PIx[3:0]D
PTOxCK
PMOD, SMOD[1:0], PAR
RLBK
SOxCKP/N
SOxDP/N
CMI
Rx CDR
Decoder
Adaptive
Eq.
RXxP/N
POx[3:0]D
POxCK
Lock Detect
LOS Detect
CMI
LLBK
EACH CHANNEL: Rx
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2006 Teridian Semiconductor Corporation
Rev. 2.4