78P2351
Single Channel
OC-3/ STM1-E/ E4 LIU
DATA SHEET
SEPTEMBER 2006
DESCRIPTION
The 78P2351 is Teridian’s second generation Line
Interface Unit (LIU) for 155 Mbps (OC-3, STS-3, or
STM-1) and 140 Mbps PDH (E4) telecom interfaces.
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 75
Ω
coaxial cable using
CMI coding or directly to a fiber optics transceiver
module using NRZ coding.
The 78P2351 is
compliant with all respective ANSI, ITU-T, and
Telcordia standards for jitter tolerance, generation,
and transfer.
FEATURES
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ITU-T G.703 compliant 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 12.7dB of cable loss
Serial, LVPECL-compatible system interface
with integrated CRU in transmit path for flexible
NRZ to CMI conversion.
4-bit parallel CMOS system interface with
master and slave Tx clock modes.
Selectable LVPECL compatible NRZ media
interface for 155.52 Mbps optical transmission.
Configurable via HW control pins or 4-wire serial
interface
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
Operates from a single 3.3V supply
100-pin JEDEC LQFP
APPLICATIONS
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Central Office Interconnects
DSLAMs
Add Drop Multiplexers (ADMs)
PDH/SDH test equipment
Multi Service Switches
Digital Microwave Radios
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
Page: 1 of 42
2006 Teridian Semiconductor Corporation
Rev. 2.4
TERIDIAN [ TERIDIAN SEMICONDUCTOR CORPORATION ]
