Keysigth Technologies N4903B J-BERT

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19 | Keysight | J-BERT N4903B High-Performance Serial BERT, 7 Gb/s and 12.5 Gb/s - Data Sheet
Error Detector Specications continued
Tunable loop bandwidth 500 kHz to 12 MHz for data rates
1.46 Gb/s to 12.5 Gb/s
100 kHz to 4 MHz for data rates
1 Gb/s to 1.46 Gb/s
Loop bandwidth accuracy 10% typical (at transition density 50%)
Transition density
compensation
25% to 100%. The CDR can automatically
detect the transition density of the
incoming data pattern and compensates the
loop bandwidth accordingly.
Tracking range (SSC) +0.05% to -0.55% (5500 ppm) deviation
of data rate. User can disable/enable SSC
tracking. Loop bandwidth > 1 MHz and
medium or max peaking enabled
Jitter peaking Three customer selectable values between 0
and 3 dB; see frequency response in Figure
27
Fine adjust Manual adjustment -1.0 to + 1.0 of CDR
settings to minimize CDR output jitter
Compliant CDR settings PCIe
TM
, SATA, FC, FB-DIMM, CEI, GE,10 GbE,
XAUI, XFP/XFI, SONET OC-48/192 (see Table
23). User can add own CDR settings
Relax time < 1 sec typical
Table 23. Specications for tunable loop bandwidth
Loop
bandwidth
(MHz)
Tunable loop bandwidth
Data rate
(Gb/s)
12.511.5
1.461.0
0.5
0.1
4.0
7.5
12.0
igure 26. DR loop bandwidth
igure 27. Three selectable freuency response settings. The example shows JT
loop bandwidth of 900 z and 0 dB 1.2 dB 2.8 dB peaing
20 dB/decade
Standard Revision Data rate (Gb/s) JTF loop bandwidth (MHz) Jitter peaking (dB) SSC possible
PCIe 1.0
1.1
2.0
3.0
2.5
2.5
5.0
8.0
1.5
5
8
10
0
1
0.9
TBD
Yes
SATA I
II
III
1.5
3.0
6.0
0.9, 3.0
1.8, 6.0
TBD
1.3
1.7, 1.8
TBD
Yes
FB-DIMM 1
2
3.2, 4.0, 4.8
4.8, 6.4, 8.0, 9.6
11
1
0.9 Yes
Fibre Channel 1
2
4
8
10
1.063
2.125
4.25
8.5
10.518
0.638
1.275
2.55
2.55
4.0
0 No
CEI 6.0
2
11.0
6.0
11.0
4.0 (fbaud/1667)
8.0 (fbaud/1667)
0
0.1
No
1 GbE 1.25 4 0 No
10 GbE 10.312 4 0 No
10 GbE XAUI 3.125 1.875 0 No
SONET/SDH OC-48/STM-16
OC-192/STM-64
9.953 4 0 No
XFP/XFI
9.95
3
RX: 8.0
TX: 4.0
0.1
0
No
1. The standard allows 11 MHz to 22 MHz.
2. EI standard allows data rates of 4.976 to 6.375 Gb/s and 9.95 to 11.1 Gb/s.
3. XP/XI standard allows data rates of 9.95 to 11.2 Gb/s.
Table 24. ompliance settings for DR