CP50 1.5 meter Differential Pair Cable Assembly
Test 256
JFSawdy 12/19/02, revised 1/7/03
Scope of Testing
The following differential measurements were made:
Eye diagram at 2.5 Gb/s (also includes simulations at 5Gb/s)
Frequency Domain Attenuation from 1MHz to 10GHz
Crosstalk with 3 aggressor lines, 84 and 150pS risetime
Test Equipment
Tektronix CSA-803/SD-24 TDR Signal Analyzer
Anritsu MP1701B 10Gb/s Pattern Generator
Avtech AVP-AV, 6 channel, bipolar Pulse Generator
TDA Systems' IConnect
TM
interconnect and lossy cable characterization software atSpeed’s Oculus eXtractor
M
S-parameter extraction software
Tested Assembly
The tests were performed on a 1.5-meter assembly with CP-50 connectors terminating each end. These CP-50 connectors were plugged into right angle CP-50 connectors mounted to pc boards with vias to receive the connector pins. There are no traces or ground planes in the pc boards. Semi-rigid coax was soldered to the connector pins on the backside of the pc board. The cable is a 28awg parallel pair (part number 700219-
01).
MERITEC
•
1359 WEST JACKSON STREET
•
POST OFFICE BOX 8003
•
PAINESVILLE, OHIO 44077
888-MERITEC (888-637-4832) / (440)-354-3148
•
FAX: (440) 354-0509
•
WWW.MERITEC.COM
•
INFO@MERITEC.COM

Measured Eye Patterns
Fixture
Eye pattern through fixture (includes semi-rigid coax)
Stimulus is 2.5Gb/s, 400mv peak to peak, 2^7-1 PRBS
- 2 -
Cable Output
Eye pattern through fixture, connectors and cable
Stimulus is 2.5Gb/s, 400mv peak to peak, 2^7-1 PRBS
Eye opening = 380mv Eye height is 250mv out = 63%
Risetime < 40 psec
Jitter < 50ps = 12.5% or .125UI
MERITEC
•
1359 WEST JACKSON STREET
•
POST OFFICE BOX 8003
•
PAINESVILLE, OHIO 44077
PHONE: 888-MERITEC or (888-637-4832) / (440)-354-3148
•
FAX: (440) 354-0509
•
WEBSITE: WWW.MERITEC.COM

Simulated Eye Patterns
- 3 -
Eye diagram at 2.5Gb/s, 40psec risetime, 400mv input
Shows eye height to be >250mv and jitter to <.12UI
This eye is generated using IConnect software and is based on TDT measurements
This can be compared to the preceding measured eye to note the excellent correlation between the software-extracted eye and the measured eye.
MERITEC
•
1359 WEST JACKSON STREET
•
POST OFFICE BOX 8003
•
PAINESVILLE, OHIO 44077
PHONE: 888-MERITEC or (888-637-4832) / (440)-354-3148
•
FAX: (440) 354-0509
•
WEBSITE: WWW.MERITEC.COM

- 4 -
Eye diagram at 2.5Gb/s, 120psec risetime, 800mv input
Shows eye height to be >500mv and jitter to <.12UI
This eye is generated using IConnect software and is based on TDT measurements.
MERITEC
•
1359 WEST JACKSON STREET
•
POST OFFICE BOX 8003
•
PAINESVILLE, OHIO 44077
PHONE: 888-MERITEC or (888-637-4832) / (440)-354-3148
•
FAX: (440) 354-0509
•
WEBSITE: WWW.MERITEC.COM

- 5 -
Eye diagram at 5.0Gb/s, 50psec risetime, 800mv input
Shows eye height to be >300mv and jitter to <.25UI
MERITEC
•
1359 WEST JACKSON STREET
•
POST OFFICE BOX 8003
•
PAINESVILLE, OHIO 44077
PHONE: 888-MERITEC or (888-637-4832) / (440)-354-3148
•
FAX: (440) 354-0509
•
WEBSITE: WWW.MERITEC.COM

Attenuation
- 6 -
S21 extracted from TDT measurements using atSpeed’s Oculus software
Includes effects of semirigid coax attachment to pc boards
MERITEC
•
1359 WEST JACKSON STREET
•
POST OFFICE BOX 8003
•
PAINESVILLE, OHIO 44077
PHONE: 888-MERITEC or (888-637-4832) / (440)-354-3148
•
FAX: (440) 354-0509
•
WEBSITE: WWW.MERITEC.COM

- 7 -
Crosstalk
Longest pins Pin 1
G S3b G S3a G S2b G S2a G S1b G S1a
S6b G S6a G S5b G S5a G S4b G S4a G
G S9b G S9a G S8b G S8a G S7b G S7a
S12b G S12a G S11b G S11a G S10b G S10a G
Front view of pc board right angle connector
G G G G G G
S12b S12a S11b S11a S10b S10a
S9b S9a S8b S8a S7b S7a
G G G G G G
G G G G G G
S6b S6a S5b S5a S4b S4a
S3b S3a S2b S2a S1b S1a
G G G G G G
Pin 1 Longest pins
Bottom view of pc board
S5 quiet
Aggressor is a 1000mv pulse
FEXT
Aggressor
S2
S3
S6
150 ps
Risetime
84psec
5.3mv 0.5% 6.3mv 0.6%
4.2mv 0.4% 4.6mv 0.5%
5.2mv 0.5% 5.2mv 0.5%
NEXT
Aggressor
S2
S3
S6
Risetime
150 ps 84psec
13.7mv 1.4% 16.7mv 1.7%
11.7mv 1.2% 14.3mv 1.4%
5.0mv 0.5% 5.0mv 0.5%
MERITEC
•
1359 WEST JACKSON STREET
•
POST OFFICE BOX 8003
•
PAINESVILLE, OHIO 44077
PHONE: 888-MERITEC or (888-637-4832) / (440)-354-3148
•
FAX: (440) 354-0509
•
WEBSITE: WWW.MERITEC.COM