81250 Datasheet, PDF (46/64 Pages) Keysight Technologies – Agilent ParBERT 81250 Parallel Bit Error Ratio Tester

Table 53. Pattern and sequencing features of E4832A
Patterns:
Memory based
Up to 2 Mbit
PRBS/PRWS
2ⁿ - 1, n = 7, 9, 10, 11, 15, 23, 31
Mark density
1/8, 1/4, 1/2, 3/4, 7/8 at 2ⁿ - 1, n = 7, 9, 10, 11, 15
Errored PRBS/PRWS 2ⁿ - 1, n = 7, 9, 10, 11, 15
Extended ones or zeros 2ⁿ - 1, n = 7, 9, 10, 11, 15
Clock patterns
Divide or multiply by 1, 2, 4
User patterns
Data editor, file import
Analyzer
On PRBS or memory-based data
auto-synchronization (2): manual or automatic by:
Bit synchronization (1) with or without automatic
phase alignment
Automatic delay alignment around start sample
delay (range: ±50 ns)
BER threshold: 10^-4 to 10^-9
(1) Bit synchronization on data is achieved by detecting a 48 bit unique word at the beginning of the
segment. “Don’t cares” within the detect word are possible. In this mode no memory-based data
can be sent within the same system. If several inputs synchronize, the delay difference between
the terminals must be ±5 segment length resolution.
(2) Condition: frequency > 20.8 MHz and by using the finest segment length resolution.
Table 54. Data rate range, segment length resolution, available memory for synchronization and
fine delay operation
Data rate range
Mb/s
20.834 ... 41.666
41.667 ... 83.333
83.334 ... 166.666
166.667 ... 333.333
333.334 ... 666.667
Segment
length
1 bit
2 bits
4 bits
8 bits
16 bits
Maximum memory
resolution depth, bits
131,008
262,016
524,032
1,048,064
2,097,152
In general, it is possible to set higher values for the segment length resolution and also at
lower frequencies than are indicated in the table. In this case the fine delay function and
the auto-synchronization function are unavailable.
Table 55. between the capability of generating PRWS and port width, almost all the combinations
are possible except the following:
PRWS
2⁷ - 1
2⁹ - 1
2¹⁰ - 1
2¹¹ - 1
2¹⁵ - 1
2²³ - 1
2³¹ - 1
Port width
No restriction
7
3, 11, 31, 33
23
7, 31
47
No restriction
Page 46/64
ParBERT 81250 Main Overview