81250 Datasheet, PDF (29/64 Pages) Keysight Technologies – Agilent ParBERT 81250 Parallel Bit Error Ratio Tester

Clock data recovery
The analyzer module has integrated
CDR capabilities, which allow the
recovery of either clock or data.
Before the CDR can lock onto the
incoming data stream, the data
rate must be defined within the
user interface; common data rates
are pre-defined. In CDR mode,
phase alignment to the center of
the eye is done automatically
during synchronization. For cor-
rect operation, the CDR output
must be connected to the clock
input of the E4809A central clock
module. In addition the generator
clock source and the analyzer
clock source must be independent.
AUX OUT
The AUX OUT provides data or
recovered clock signals.
AUX IN
Gating functionality: if a high level
is applied at AUX IN, comparison
is disabled and internal counters
are stopped. After resuming a
low level at AUX IN, comparison
is enabled and internal counters
continue. The internal sequencing
is not stopped.
ERROR OUT
Whenever one or more bit errors
are detected, the error out signal is
high for one segment resolution.
A high period is always followed
by a low period (RZ-format) in
order to ensure trigger possibility
on continuous errors.
Table 24. Parameters for N4873A ParBERT 13.5 Gb/s analyzer - clock data recovery
Common data rates
OC-192:
9.953 Gb/s
10GbE:
10.3125 Gb/s
Fiber channel:
10.51875 Gb/s
G.709/G.975:
10.664 Gb/s/10.709 Gb/s
S-ATA:
1.5/3.0/6.0 Gb/s
PCI-Express:
2.5/5.0/8.0 Gb/ss
OC-48:
2.488 Gbit/s
10GbE (XAUI):
3.125 Gbit/s
SAN:
3.187 Gbit/s
Frequency ranges
9.9 GHz …10.90 GHz
4.23 GHz ... 6.4 GHz
2.115 GHz … 3.2 GHz
1.058 GHz....1.6 GHz
(1)
The CDR works with specified PRBS patterns up to 2³¹ - 1,
The CDR expects a DC balanced pattern,
The CDR expects an average transition density of one transition
for every second bit.
(1) Available for hardware S/N DE43A00401 and software rev. 5.62 and above
Table 25. Parameters for N4873A 13.5 Gb/s analyzer - AUX OUT
Interface
Amplitude
Output jitter (clock @ AUX OUT)
Connector
AC Coupled, 50 Ω nominal
600 mV nominal
0.01 UI rms typical
SMA female
ParBERT 81250 Main Overview
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