XRT75L06
SIX CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR
MARCH 2004
REV. 1.0.3
GENERAL DESCRIPTION
The XRT75L06 is a six
Interface Unit (LIU) for
The LIU incorporates
Transmitters and Jitter
Lead BGA package.
channel fully integrated Line
E3/DS3/STS-1 applications.
6 independent Receivers,
Attenuators in a single 217
attenuator performance meets the ETSI TBR-24 and
Bellcore GR-499 specifications.
The XRT75L06 provides a Parallel Microprocessor
Interface for programming and control.
The XRT75L06 supports analog, remote and digital
loop-backs. The device also has a built-in Pseudo
Random Binary Sequence (PRBS) generator and
detector with the ability to insert and detect single bit
error for diagnostic purposes.
Each channel of the XRT75L06 can be independently
configured to operate in E3 (34.368 MHz), DS3
(44.736 MHz) or STS-1 (51.84 MHz). Each
transmitter can be turned off and tri-stated for
redundancy support or for conserving power.
The XRT75L06’s differential receiver provides high
noise interference margin and is able to receive data
over 1000 feet of cable or with up to 12 dB of cable
attenuation.
The XRT75L06 incorporates an advanced crystal-
less jitter attenuator per channel that can be selected
either in the transmit or receive path. The jitter
APPLICATIONS
•
E3/DS3 Access Equipment
•
DSLAMs
•
Digital Cross Connect Systems
•
CSU/DSU Equipment
•
Routers
•
Fiber Optic Terminals
F
IGURE
1. B
LOCK
D
IAGRAM OF THE
XRT 75L06
CS
RD
WR
Addr[7:0]
D[7:0]
PCLK
RDY
INT
Pmode
RESET
XRT75L06
XRT75L06
µProcessor
Interface
CLKOUT_n
SFM_en
RLOL_n
E3Clk
DS3Clk
STS-Clk/12M
MUX
Peak Detector
Slicer
Clock & Data
Recovery
LOS
Detector
Clock
Synthesizer
Jitter
Attenuator
HDB3/
B3ZS
Decoder
RTIP_n
RRing_n
AGC/
Equalizer
RxClk_n
RxPOS_n
RxNEG/LCV_n
Local
LoopBack
Remote
LoopBack
RLOS_n
TxClk_n
TxPOS_n
TxNEG_n
TTIP_n
TRing_n
MTIP_n
MRing_n
DMO_n
ICT
Line
Driver
Tx
Pulse
Shaping
Timing
Control
Jitter
Attenuator
MUX
HDB3/
B3ZS
Encoder
Device
Monitor
Tx
Control
TxON
Channel 0
Channel n...
Channel 5
ORDERING INFORMATION
P
ART
N
UMBER
XRT75L06IB
P
ACKAGE
217 Lead BGA
O
PERATING
T
EMPERATURE
R
ANGE
-40
°
C to +85
°
C
Exar
Corporation 48720 Kato Road, Fremont CA, 94538
•
(510) 668-7000
•
FAX (510) 668-7017
•
www.exar.com
EXAR [ EXAR CORPORATION ]
