xrt75r12 Exar Corporation, xrt75r12 Datasheet - Page 29

• Manufacturer Part Number: xrt75r12
• Description: Twelve Channel E3/ds3/sts-1 Line Interface Unit With Jitter
• Manufacturer: Exar Corporation

REV. 1.0.4
The decoder block takes the output from the clock and data recovery block and decodes the B3ZS (for DS3 or
STS-1) or HDB3 (for E3) encoded line signal and detects any coding errors or excessive zeros in the data
stream. Whenever the input signal violates the B3ZS or HDB3 coding sequence for bipolar violation or
contains three (for B3ZS) or four (for HDB3) or more consecutive zeros, an active “High” pulse is generated on
the RLCV_n output pins to indicate line code violation.
3.6
SYMBOL
RxClk
t
t
t
LCVO
t
RRX
FRX
CO
B3ZS/HDB3 Decoder
Duty Cycle
RxClk Frequency
E3
DS-3
STS-1
RxClk rise time (10% o 90%)
RxClk falling time (10% to 90%)
RxClk to RPOS/RNEG delay time
RxClk to rising edge of LCV output delay
TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR
PARAMETER
26
MIN
45
34.368
44.736
51.84
TYP
2.5
50
2
2
MAX
55
4
4
4
XRT75R12
UNITS
MHz
MHz
MHz
ns
ns
ns
ns
%