Test of optical links on CN V.3 David M unchow for the Gieen Group - - PowerPoint PPT Presentation

▶

Oct 08, 2022 31 likes •132 views

Test of optical links on CN V.3 David M unchow for the Gieen Group Belle II PXD/SVD Workshop 5. February 2013, Wetzlar, Germany 1 Test Setup 2 Hardware Modifications 3 Software Issues 4 Test Results Test Setup In final setup input rate of

SLIDE 1

Test of optical links on CN V.3

David M¨ unchow

for the Gießen Group

Belle II PXD/SVD Workshop

5. February 2013, Wetzlar, Germany

1 Test Setup 2 Hardware Modifications 3 Software Issues 4 Test Results

SLIDE 2

Test Setup

In final setup input rate of 6.25 Gbit/s is needed Test of CN V.3 with 4 SFP cages Tested with IBERT core generated with Xilinx Core Generator

David M¨ unchow (JLU Gießen) Test of optical links on CN V.3

5. Fabruary 2013

2 / 10

SLIDE 3

Hardware Modifications: Oszillator

Change of oszillator

Board was delivered with 200 MHz quarz

Possible data rate i.e.: 4 Gbit/s (workes, error ratio not checked)

Changed to 156.25 MHz quarz (IHEP will use this in future)

Possible data rate i.e.: 3.125 Gbit/s or 6.25 Gbit/s

Risk of braking conductor path during replacement

David M¨ unchow (JLU Gießen) Test of optical links on CN V.3

5. Fabruary 2013

3 / 10

SLIDE 4

Hardware Modifications: SFP Speed Settings

Removal of resistors

SFP connector have two pins to select limitation to 4.25 Gbit/s or allow speed up to 8.5 Gbit/s We had to remove 8 resistors to be shure the limitation is off. IHEP changed resistors for future production to meet our needs

David M¨ unchow (JLU Gießen) Test of optical links on CN V.3

5. Fabruary 2013

4 / 10

SLIDE 5

Software Issues

Problems with IBERT of ISE 13 or ISE 14 (current version)

settings were correct for 6.25 Gbit/s test software shows 4.883 Gbit/s and connection is reality 3.125 Gbit/s (crosscheck by counting received bits)

IBERT works correct with ISE 12 (2 years old)

David M¨ unchow (JLU Gießen) Test of optical links on CN V.3

5. Fabruary 2013

5 / 10

SLIDE 6

Test Results 6.25 Gbit/s

Connections in test setup:

X0Y3 0 ←→ X0Y3 1 X0Y4 0 ←→ X0Y4 1

Result after > 77 hours:

X0Y3 0 X0Y3 1 X0Y4 0 X0Y4 1 bit error count 1 99 bit error ratio 5.735 · 10−16 < 5.735 · 10−16 5.677 · 10−14 < 5.735 · 10−16

David M¨ unchow (JLU Gießen) Test of optical links on CN V.3

5. Fabruary 2013

6 / 10

SLIDE 7

Test Results 3.125 Gbit/s

Connections in test setup:

X0Y3 0 ←→ X0Y3 1 X0Y4 0 ←→ X0Y4 1

Result after > 24 hours:

X0Y3 0 X0Y3 1 X0Y4 0 X0Y4 1 bit error count bit error ratio < 1.851 · 10−15 < 1.851 · 10−15 < 1.851 · 10−15 < 1.851 · 10−15

David M¨ unchow (JLU Gießen) Test of optical links on CN V.3

5. Fabruary 2013

7 / 10

SLIDE 8

Check for error source for bit error

SFP tranceiver switched Cables switched

Result: error source at receiving side

Currently using speed grade -1

Xilinx garuantees support up to 6.5 Gb/s only with speed grade -2 or -3

In future speed grade -2 will be used

David M¨ unchow (JLU Gießen) Test of optical links on CN V.3

5. Fabruary 2013

8 / 10

SLIDE 9

Summary

CN V.3 tested for 6.26 Gb/s Some hardware changes needed

szillator, resistors

Software issues

With ISE 13 or 14 the IBERT does not work for 6.25 Gb/s Using old ISE 12 the IBERT works fine

Result for 6.25 Gb/s (77 hour test)

3 channels bit error ratio ≤ 5.735 · 10−16 1 channel bit error ratio 5.677 · 10−14

Result for 3.125 Gb/s (24 hour test)

All channels bit error ratio < 1.851 · 10−15 (0 errors)

David M¨ unchow (JLU Gießen) Test of optical links on CN V.3

5. Fabruary 2013

9 / 10

SLIDE 10

Test of optical links on CN V.3

Thank you for your attention!

David M¨ unchow (JLU Gießen) Test of optical links on CN V.3

5. Fabruary 2013

10 / 10