improved qsfp and sfp+ connectors -...
TRANSCRIPT
Amphenol1/21/2010 1
Improved QSFP and SFP+ Connectors
Brian Kirk, Greg McSorleyAmphenol Corp
January 26, 2010
Amphenol1/21/2010 2
Current QSFP
QSFP Receptacle Measurement Fixture
Amphenol1/21/2010 3
Measurement: Insertion Loss (TX3) and TX3 to TX1 Crosstalk (includes fixture)
0 2 4 6 8 10 12 14 16 18 20-40
-35
-30
-25
-20
-15
-10
-5
0insertion loss and PSXTALK
Frequency (GHz)
Insertion lossPSNEXTPSFEXT
Amphenol1/21/2010 4
QSFP NEXT Full Cable Assembly
0.00 2.00 4.00 6.00 8.00 10.00 12.00 14.00 16.00 18.00 20.00F [GHz]
-80.00
-70.00
-60.00
-50.00
-40.00
-30.00
-20.00
-10.00
0.00
Y1
Ansoft Corporation Nexxim1QSFP NEXT Tx1Tx3Curve Info
dB20(SDD21)LinearFrequency
dB20(SDD11)LinearFrequency
dB20(SDD22)LinearFrequency
Amphenol1/21/2010 5
Current vs. Enhanced QSFP against SFF-8431 (SFP) spec lines
Amphenol1/21/2010 6
Differential Insertion Loss
0 5 10 15-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
Frequency (GHz)
Mag
nitu
de (d
B)
Current production QSFP socket SDD21
long row insertion lossshort row insertion lossSFF-8431 equivalent fixture thruSFF-8431 spec line (max)SFF-8431 spec line (min)
0 5 10 15-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
Frequency (GHz)
Mag
nitu
de (d
B)
Enhanced QSFP socket SDD21
long row insertion lossshort row insertion lossSFF-8431 equivalent fixture thruSFF-8431 spec line (max)SFF-8431 spec line (min)
*(amplitude fixture corrected – SFF-8431 C.1.1 & C.1.2)
Amphenol1/21/2010 7
Differential Return Loss
0 5 10 15-40
-35
-30
-25
-20
-15
-10
-5
0
Frequency (GHz)
Mag
nitu
de (d
B)
Current production QSFP socket SDD11
long row return lossshort row return lossSFF-8431 spec line
0 5 10 15-40
-35
-30
-25
-20
-15
-10
-5
0
Frequency (GHz)
Mag
nitu
de (d
B)
Enhanced QSFP socket SDD11
long row return lossshort row return lossSFF-8431 spec line
Current Enhanced
Amphenol1/21/2010 8
Common mode return loss
0 1 2 3 4 5 6 7 8 9 10-20
-18
-16
-14
-12
-10
-8
-6
-4
Frequency (GHz)
Mag
nitu
de (d
B)
Current production QSFP socket SCC11
long row return lossshort row return lossSFF-8431 spec line
0 1 2 3 4 5 6 7 8 9 10-20
-18
-16
-14
-12
-10
-8
-6
-4
Frequency (GHz)M
agni
tude
(dB
)
Enhanced QSFP socket SCC11
long row return lossshort row return lossSFF-8431 spec line
Current Enhanced
Amphenol1/21/2010 9
Mode conversion
0 1 2 3 4 5 6 7 8 9 10-40
-35
-30
-25
-20
-15
-10
-5
0
Frequency (GHz)
Mag
nitu
de (d
B)
Current production QSFP socket SCD12
long row mode conversionshort row mode conversionSFF-8431 spec line
0 1 2 3 4 5 6 7 8 9 10-40
-35
-30
-25
-20
-15
-10
-5
0
Frequency (GHz)
Mag
nitu
de (d
B)
Enhanced QSFP socket SCD12
long row mode conversionshort row mode conversionSFF-8431 spec line
0 1 2 3 4 5 6 7 8 9 10-40
-35
-30
-25
-20
-15
-10
-5
0
Frequency (GHz)
Mag
nitu
de (d
B)
Current production QSFP socket SDC12
long row mode conversionshort row mode conversionSFF-8431 spec line
0 1 2 3 4 5 6 7 8 9 10-40
-35
-30
-25
-20
-15
-10
-5
0
Frequency (GHz)
Mag
nitu
de (d
B)
Enhanced QSFP socket SDC12
long row mode conversionshort row mode conversionSFF-8431 spec line
Current Enhanced
Amphenol1/21/2010 10
Individual near-end crosstalk sources
0 5 10 15-60
-50
-40
-30
-20
-10
0
Frequency (GHz)
Mag
nitu
de (d
B)
Current produc tion QSFP socket differential long row NEXT
Long row-long rowLong row - short row (1)Long row - short row (2)SFF-8431 spec line
0 5 10 15-60
-50
-40
-30
-20
-10
0
F requenc y (G Hz )
Mag
nitu
de (d
B)
E nhanc ed Q S F P s oc k et d ifferent ia l long row NE XT
Long row-long rowLong row - s hort row (1)Long row - s hort row (2)S F F -8431 s pec line
0 5 10 15-60
-50
-40
-30
-20
-10
0
Frequency (GHz)
Mag
nitu
de (d
B)
Current production QSFP socket differential short row NEXT
Short row-long row (1)Short row - long row (2)Short row - short rowSFF-8431 spec line
0 5 10 15-60
-50
-40
-30
-20
-10
0
Frequency (GHz)
Mag
nitu
de (d
B)
Enhanced QSFP socket differential short row NEXT
Short row-long row (1)Short row - long row (2)Short row - short rowSFF-8431 spec line
Current Enhanced
Amphenol1/21/2010 11
Individual near-end crosstalk sources
0 5 10 15-60
-50
-40
-30
-20
-10
0
Frequency (GHz)
Mag
nitu
de (d
B)
Current production QSFP socket differential long row NEXT
Long row-long rowLong row - short row (1)Long row - short row (2)SFF-8431 spec line
0 5 10 15-60
-50
-40
-30
-20
-10
0
Frequency (GHz)
Mag
nitu
de (d
B)
Enhanced QSFP socket differential long row NEXT
Long row-long rowLong row - short row (1)Long row - short row (2)SFF-8431 spec line
0 5 10 15-60
-50
-40
-30
-20
-10
0
Frequency (GHz)
Mag
nitu
de (d
B)
Current production QSFP socket differential short row NEXT
Short row-long row (1)Short row - long row (2)Short row - short rowSFF-8431 spec line
0 5 10 15-60
-50
-40
-30
-20
-10
0
Frequency (GHz)
Mag
nitu
de (d
B)
Enhanced QSFP socket differential short row NEXT
Short row-long row (1)Short row - long row (2)Short row - short rowSFF-8431 spec line
Current Enhanced
Amphenol1/21/2010 12
SFP+ Stacked
Amphenol1/21/2010 13
Compliance Board measurements
0 2 4 6 8 10-30
-25
-20
-15
-10
-5
0
Frequency (GHz)
Mag
nitu
de (d
B)
Return Loss for SFP+ on Broadcom Board (Compliance)
Aph New#1#2SFF Compliance Boards Spec. Page 69
End of the cable SOLTComplianceBoard Measurements
Amphenol1/21/2010 14
Effect of Spirent Host Compliance Card
AmphenolSpirent
Paddle Card PCB TraceHost PCB Trace
Connector
Mating Interface Area
Amphenol1/21/2010 15
Receptacle Comparison (12ps)
Standard SFP+ Testcard
500 550 600 650 700 750 800 850 90075
80
85
90
95
100
105
110
115
120
125
Time (ps)
Ohm
s)
SFP+ Receptacle
New Aph#1#2
ImprovedImpedance
Amphenol1/21/2010 16
Stacked SFP Comparison Measurements
TDR – Top port
Via on Motherboard
leadframe
Mating Interface
Amphenol Blue
Older component
Footprint has been improvedIn new release
Amphenol1/21/2010 17
Top port Stacked Sfp+
0 1 2 3 4 5 6 7 8 9 10-12
-10
-8
-6
-4
-2
0
Frequency (GHz)
Sdd
12 M
agni
tude
in d
B
SFP+ Comparison: Differential Insertion Loss
Other Supplier: TX PairAmphenol: TX Pair
Amphenol1/21/2010 18
Common Mode Return Loss
0 1 2 3 4 5 6 7 8 9 10-20
-18
-16
-14
-12
-10
-8
-6
-4
Frequency (GHz)
Mag
nitu
de (d
B)
Stacked SFP Comparision - Common Mode Return Loss (Top Ports)
AmphenolSupplier BSpec Limit
0 1 2 3 4 5 6 7 8 9 10-20
-18
-16
-14
-12
-10
-8
-6
-4
Frequency (GHz)
Mag
nitu
de (d
B)
Stacked SFP Comparision - Common Mode Return Loss (Bottom Ports)
AmphenolSupplier BSpec Limit
Amphenol1/21/2010 19
Differential Return Loss
0 1 2 3 4 5 6 7 8 9 10-40
-35
-30
-25
-20
-15
-10
-5
0
Frequency (GHz)
Mag
nitu
de (d
B)
Stacked SFP Comparision - Differential Return Loss (Top Ports)
AmphenolSupplier BSpec Limit
0 1 2 3 4 5 6 7 8 9 10-40
-35
-30
-25
-20
-15
-10
-5
0
Frequency (GHz)
Mag
nitu
de (d
B)
Stacked SFP Comparision - Differential Return Loss (Bottom Ports)
AmphenolSupplier BSpec Limit
Amphenol1/21/2010 20
NEXT Crosstalk
0 1 2 3 4 5 6 7 8 9 10-60
-55
-50
-45
-40
-35
-30
-25
-20
Frequency (GHz)
Mag
nitu
de (d
B)
Stacked SFP Comparision - NEXT (Bottom Ports)
AmphenolSupplier BSpec Limit
0 1 2 3 4 5 6 7 8 9 10-60
-55
-50
-45
-40
-35
-30
-25
-20
Frequency (GHz)
Mag
nitu
de (d
B)
Stacked SFP Comparision - NEXT (Top Ports)
AmphenolSupplier BSpec Limit
Amphenol1/21/2010 21
Mode Conversion
0 1 2 3 4 5 6 7 8 9 10-40
-35
-30
-25
-20
-15
-10
-5
0
Frequency (GHz)
Mag
nitu
de (d
B)
Stacked SFP Comparision - Mode Conversion (Sdc) (Top Ports)
AmphenolSupplier BSpec Limit
0 1 2 3 4 5 6 7 8 9 10-40
-35
-30
-25
-20
-15
-10
-5
0
Frequency (GHz)
Mag
nitu
de (d
B)
Stacked SFP Comparision - Mode Conversion (Sdc) (Bottom Ports)
AmphenolSupplier BSpec Limit
0 1 2 3 4 5 6 7 8 9 10-40
-35
-30
-25
-20
-15
-10
-5
0
Frequency (GHz)
Mag
nitu
de (d
B)
Stacked SFP Comparision - Mode Conversion (Scd) (Top Ports)
AmphenolSupplier BSpec Limit
0 1 2 3 4 5 6 7 8 9 10-40
-35
-30
-25
-20
-15
-10
-5
0
Frequency (GHz)
Mag
nitu
de (d
B)
Stacked SFP Comparision - Mode Conversion (Scd) (Bottom Ports)
AmphenolSupplier BSpec Limit
Amphenol1/21/2010 22
Insertion loss
0 1 2 3 4 5 6 7 8 9 10-12
-10
-8
-6
-4
-2
0
Frequency (GHz)
Sdd
12 M
agni
tude
in d
BSFP+ Comparison: Differential Insertion Loss
Other Supplier: TX PairAmphenol: TX Pair