Optoboard System design

ATLAS ITk Pixel Readout Architecture

As defined in the ATLAS ITk Pixel Technical Design Report, the Optoboard System provides connections to all electrical data and command lines from the Inner Tracker (ITk) Pixel RD53 front-end chips. The electrical data signals received from the detector are multiplexed and converted into optical signals and are routed to the off-detector readout cards through optical fibres. The command signals for all modules in the Pixel detector are received through the same opto-electrical transceiver, de-multiplexed and routed from the optobox to the modules through the electrical downlink cables.

More details about the current ITk Pixel readout architecture can be found in the ITk Pixel Services Specification document.

DataTransmission scheme.png
Data transmission scheme

Data transmission chain BERN.JPG
ITk Pixel Data Transmission Chain Setup in Bern

Optoboard System design

The Optoboard System sits at the outside of the ITk. The locations at the end Plate of the ITk at z=350 cm and r=150-230 cm feature an available area of 52x100 cm^2 per quadrant, while the seven locations in-between the LAr boxes are 30x35 cm^2 big each. In z, 9.5 cm (CHECK) are available for the Optoboard System. A total of 154 Optoboxes can fit into the available space per detector side. The Optoboxes are arranged in rows of up to 7, sharing a common bottom plate responsible for cooling of the ASICs and dry air supply to keep humidity low.

Twinax cables carrying the electrical signal from/to the front-end (FE) chips are terminated on the termination boards, which are connected to one Optoboard each. One Optobox contains up to 8 Optoboards. One Optoboard features up to four Gigabit Cable Receiver (GBCR) ASICs, up to four Low-power Gigabit Transceiver ASICs ( LpGBT), one Versatile Link Transceiver Plus ( VTRx+) module and one bPol2V5 DCDC converter. The GBCR is responsible for equalizing/sending the electrical signal. The LpGBT multiplexes/de-multiplexing the high-speed uplinks/downlinks. The VTRx+ converts the high-speed electrical signal to an optical signal and vice-versa. The optical signals from/to the VTRx+ are transmitted in optical fibers, bundled into two MPO24 fiber cables, connecting the Optobox to the FELIX system in the counting room. The bPol2V5 DCDC converter receives 2.5 V power from the Powerbox and converts it to 1.2 V for the ASICs of the Optoboard.

The Powerboxes are located next to the Optobox. In the Powerbox, there is the Power board featuring up to five bPol12V DCDC converter to supply the Optobox with power. The Powerbox is supplied with an input power of 10-12 V from power supplies in USA15/US15 caverns. The bPol12V convert this to 2.5 V for the bPol2V5 on the Optoboard and for the laser drivers and trans-impedance amplifier of the VTR+. The Power board also features a Monitoring of Pixel Detector (MOPS) ASIC to monitor temperatures and DCDC converter output voltages on the Optoboards. The Optoboards are connected with the Power board by the Connector board. Monitoring signals go from the Power board out to PP3.

ITk End Plate Picture of Optoboxes in ITk End Plate location, with twinax and fiber cables. Picture of Optoboxes in-between LAr boxes, with twinax and fiber cables. Use optobox_location.key to edit figure
Optobox locations at the ITk End Plate and
in-between the LAr boxes,
Martin Janda ITk Week September 2019
Optobox arrangement in ITk End Plate location.
Optoboxes are arranged in rows of seven. Two rows share a fiber,
power, interlock and MOPS cables channel,
under which the Powerboxes lie.
Optobox arrangement in-between the LAr boxes.
Optoboxes are arranged in rows of two.
The routing of fiber and power cables still has to be decided.
Each Optoboard features one VTRx+ that converts a 2.56 Gb/s optical downlink signal from the FELIX readout system to an electrical signal. This high-speed downlink is sent to the LpGBT master for de-multiplexing into up to eight 160 Mb/s downlinks. The LpGBT protocol features a 12-bit Forward Error Correction (FEC12) that is used by the LpGBT and the backend LpGBT-fpga firmware to detect and correct transmission errors (CORRECT?). It also scrambles the data to constrain the DC unbalance in the signal and to enable the LpGBT to recover both data and a 40 MHz clock from the downlink (Clock Data Recovery (CDR)). It also includes a header for frame alignment and Clock Data Recovery (CDR). Together with the data and FEC bits, also a 4-bit header for frame alignment and a 80 Mb/s Internal Control field(IC) are embedded in the downlink. The IC data is used to configure the LpGBT master and control its I2C masters, which are used to configure the GBCR's, LpGBT slaves and the VTRx+.

LpGBT downlink frame.png
lpGBT downlink frame structure from the lpGBT Manual

Up to two 160 Mb/s downlinks then go to one of the four GBCR's that drive (DEFINE BETTER) the downlinks to ensure good signal quality over the twinax and flex cables to the FE's. The electrical downlink cables leave the Optoboard System through a connector located on top of the Optoboard that connects to the Cable Termination Board. The uplinks carrying the data from the FE's arrive on the Cable Termination Board as well. Up to six uplinks are equalized (MORE DETAILS) by a GBCR and then are multiplexed in the LpGBT master or one of the three LpGBT slaves to a 10.24 Gb/s high-speed uplink. The uplink frame structure (see LpGBT manual) is very similar to the downlink frame, but is 256 bits long. It also contains an IC field that carries data from the LpGBT or its I2C masters as a response to the FELIX system. The high-speed uplink then goes to the VTRx+ laser driver ( ldq10_I2C.pdf) which drives a vertical-cavity surface emitting laser (VCSEL) array. The downlink and uplink optical signals are guided in 5 optical fibers that are part of the VTRx+ fiber pigtail.

One Optoboard provides connectivity to up to 24 electrical uplinks and 8 downlinks. With 8 Optoboards per Optobox, this results in up to 256 twinax cables per Optobox. Four VTRx+ fiber pigtails are connected together with a fiber fan-out to cables of 24 fibers (MPO24). In this way, two MPO24 cables connect from the outside to the Optobox to guide the optical signals to/from the FELIX system.

Optoboard signal paths.png
Optoboard signal connectivity

Optobox mechanical design

The Optoboxes are equiped with Optoboards and optical cables in the lab. The Powerboxes as well are assembled before installation at the ITk.

Manufacturing procedure:

  1. Add cooling plate
  2. Screw pre-assembled Powerbox to cooling plate
  3. Screw pre-assembled Optobox to cooling plate, connecting the Connector board to the Power board
  4. Connect Vopto bundle, interlock and monitoring signals to Powerbox.
  5. Connect MPO24 patch cords to Optobox.
  6. Connect Cable Termination Boards to top of Optobox

Optobox V1 closed Optobox V1 open OPTOBOX CAD with FIBERS
Optobox V1 CAD drawing closed Optobox V1 CAD drawing open Optobox with fibers
Opto panel CAD drawing Opto panel assembly  



Name Size [mm2] Modularity Layers Schematic
Optoboard   8 per Optobox 12 Optoboard V0 schematics: G6347_lpGBT_TestPCB_V0_final.pdf
Cable termination board   1 per Optoboard    
bPol2V5 carrier board ~21x14 1 per Optoboard 5  
Connector PCB   1 per Optobox 6  
Power board   1 per Optobox 4 PowerBoard.pdf

Optoboard CAD Optoboard CAD   Optoboard CAD Optoboard CAD
CAD drawing of Optoboard V1 front side CAD drawing of Optoboard V1 back side CAD drawing of bPol2V5 carrier board CAD drawing of Connector board CAD drawing of Power board


Name Modularity Operating Voltage
Max/Nom/Min [V]
Current consumption [mA]
(End of life, highest rad.)
Max. magnetic field [T] Max. TID [MGy] 1 MeV neq/cm2 Operating temperature [C]
Package Foot print [mm2]
VTRx+ 1 per Optoboard 2.75/2.5/2.25
40 + 15/channel
5 + 10/channel
4 2 3e15 -35/60 Module 20x10
LpGBT 4 per Optoboard
1 master and 3 slaves
1.32/1.2/1.08 ~260 (CONFIRM)
4 (CONFIRM) 2 ? -20/100 BGA (17x17) 9x9
GBCR 4 per Optoboard 1.32/1.2/1.08 Nom: 150
Max: 300
Could be <100
? ~0.1?     QFN-48 7x7
bPol2V5 1 per Optoboard       0.15 2e15   Naked chip with balls for bump bonding  
bPol12V Up to 5 per Optobox       0.15 2e15   QFN32 5x5
MOPS 1 per Optobox                

Information about VTRx+ and LpGBT radiation hardnes from the data transmission task force report

See information in!master/navigator/document?D:100119946:100119946:subDocs


Type Name Modularity Mating cycles Magnetic field resistance Radiation hardness Current and voltage rating Pins
Elink connector (termination board) Edgerate 8 female 1 per Optoboard         100
Elink connector (Optoboard) Edgerate 8 male 1 per Optoboard         100
Optoboard power connector (Optoboard) SFM 1 per Optoboard         8
Optoboard power connector (Connector board) TFM 1 per Optoboard         8
Power board connector (Connector board) ERM8-025-05.0-L-DV-TR 1 per Optobox         50
Power board connector (Power board) ERF8-025-05.0-L-DV 1 per Optobox         50
Vopto, Vopto sense, interlock (Power board) G125-MS12605L3P 1 per Optobox         26
Vcan and CAN connector (Power board) 2.54mm Pitch Header SMD 1 per Optobox         10


Twinax cables

Twinax cables coming from the pixel PP0's are terminated on the Cable Termination Boards, which is connected to one Optoboard. Each Optoboard can handle a maximum of 24 uplinks and 8 downlinks which results in a maximum of 32 twinax cables per Cable Termination Board and up to 32x8=256 twinax cables connecting to one Optobox.

The twinax cable has a cross section of ~1.12x0.71=0.795 mm2. To calculate the cross section that a bundle of twinax cables needs, a packing factor of 1.6 is applied.

Twinax cable dimensions

Fiber cables and connectors

Name Connector A Connector B Modularity Type Max. TID [MGy] Length [m] Cable diameter [mm] Bending radius [mm]
VTRx+ fiber pigtail ? MT ferrule male One per Optoboard rad. hard fiber 1 TBD (min. 0.2 according to VTRx+ specs) 1.5 to 2 (according to VTRx+ specs) >7.5 (different specs: 1 and 2)
MT Spring Clamp MT ferrule male MT ferrule male One per Optoboard non-magnetic 1 ~0.02 - -
Optical fan-out 4x MT ferrule MT ferrule male Two per Optobox rad. hard fiber TBD TBD TBD >10x cable diameter (TBD)
Optobox fiber connector MT ferrule female MPO24 female Two per Optobox non-magnetic TBD 0.0193 - -
Trunk cable (144) 6x MPO24 male 6x MPO24 male 1/3 per Optobox OM3, standard fiber TBD ~100 (CONFIRM) 9 >60
Trunk fan-out (MPO24) MPO24 male trunk Two per Optobox OM3, standard fiber TBD ~1.5 trunk fan out 3.5 >60

The VTRx+ fiber pigtails are connected with the optical fan-out with a spring clamp. The optical fan-out cable ends in a MT ferrule connector that is inserted into the Optobox fiber connector. The Optobox is connected with the counting room using MPO24 patch cords. In the counting room, the separation of the uplinks and downlinks is taking place, so that MPO24 cables holding only uplinks (downlinks) are connecting to the FELIX system.

VTRx+_with_pigtail.png Fan-out.JPG MT_MPO.png Sample MPO24 cable
VTR+ with fiber pigtail featuring MT ferrule connector Prototype optical fan-out cable from
Versatile Link group, with spring clamp
connection( MTP_Spring_Clamp.pdf)
MPO-MT ferrule connector sitting in the
Optobox wall ( MT_MTP_Adapter.pdf)
MPO24 patch cord with 24 fibers ( Sample MPO24 cable)

Power and monitoring cabels

Signal Name Lines per Optobox Wire gauge Type Cable diameter [mm] Length [m] Destination
Power and
interlock cable
Vopto sense
Vopto and Vopto sense
stranded together
13.5 ~80 (CONFIRM) US/USA15 (Power supplies)
7.5 for 2x(2+2) 40~50 PP3

One Vcan cable includes two CAN buses (power and data lines). Up to four MOPS ASICs are connected on the same CAN bus.

System control and monitoring

The powering and monitoring of the Optoboards of one Optobox is done by the Power board in the Powerbox, sitting next to the Optobox.

Optoboard to Power board connectivity

Optoboard to Power board connectivity

Component configuration

The configuration for the VTRx+, LpGBT and GBCR is sent over the optical downlink from the FELIX system to the VTRx+ and to the LpGBT. In FELIX, the LpGBT-fpga backend firmware is encoding the LpGBT Internal Control (IC) data together with the front-end commands into the downlink. Forward Error Correction with 12 bits is used. The LpGBT decodes the data stream and has its internal registers configured according to the IC data. This IC data also contains data to control the I2C masters of the LpGBT.

I2C addresses of Optoboard components. X is defined by pull-up resitors, Y by internal configuration
Component I2C Address
VTRx+ 10100XX
GBCR 010 00XX

Optoboard V0 Master Slave test marked.JPG
LpGBT master-slave test with two Optoboard V0's

Optobox monitoring

Monitoring of the Optoboard System is done using the MOPS ASIC on the Power board. The MOPS is connected through a CAN bus and up 4 (or 7 as an option, if power supports it) are connected on a common bus. The power for the MOPS is also provided through the CAN cable and is common for all chips on one bus.

Temperature monitoring

Each Optoboard features one NTC which is read by the MOPS. An additional NTC is located on the Power board, which is also read by the MOPS. Further include the bPOL12V a PTAT (Proportional To Ambient Temperature) output. Due to limited number of channels, only two PTAT outputs are monitored by the MOPS. See the bPOL12V datasheet for more details on this output.

Voltage monitoring

All output voltages form the bPOL12V and bPOL2V5 are monitored by the MOPS. To match the input range, voltage dividers are included in the power- and connector board. The five 2.5V supplies are reduced by a factor 10/43 (33k and 10k resistive divider), while the 1.2V supplies are divided by 2 (10k and 10k voltage divider).

The 12V input voltage is monitored by the power supplies in the electronics cavern through sens lines.

Current monitoring

The output current of the bPOL2V5 is measured by the MOPS. This is done by measureing the voltage before and after a 10 mOhm shunt resistor. With an expected current of 1.5A, this generates a voltage drop of 15mV and should give a current resolution of ~20mA.

Humidity monitoring

The optoboxes are flushed with dry air to have a controlled environment inside. Each dry air outflow is foreseen to be measured by a humidity sensor. TO BE DEFINED


There are two temperature sensors (NTC) that go into the interlock system: one on the power board and one on the connector board. If any of them goes above 30C the power of the entire box should be switched off, excluding Vcan for the MOPS. This means that two interlock matrix crate (IMC) inputs control 5 IMC outputs.

In addition to the temperature monitored, the IMC should get an input from the cooling. If the cooling fails, the power for the entire affected opto panel should be switched off. This would be up to 140 power channels at max.

Another point for interlock could be the humidity. The IMC should have an input from the dry-air or nitrogen plant and the humidity monitoring system to have the possibility of interlocking an entire opto panel. The usage of this is

A software interlock should be implemented in WinCC to switch off the front-ends connected to the optobox. This depends if all the optoboards for a SP chain are affected and if a power cycle is ok for the modules. Vice-versa, the optoboards should be switched off, if a SP chain is switched off.

See also PixelUpgradeDCS for more information about the DCS system, including the IMC.


The cooling plate must be below 30C for proper operation of the bPOLs. The lpGBT supports only down to -20C as a lower limit. The goal is to have the box at 15-20C. First tests show that a coolant temperature of about 5-10C is required.

Dry air / Nitrogen

Independent of the location, the optoboxes are flushed with dry air or nitorgen. The entire box volume should be exchanged about once per hour. The goal is to have the same relative humidity as in the inner detector volume and at most 5%.

The requirement comes from experience with the current detector, where humidity was the reason for laser driver (VCSEL) failures in the electronics cavern and most likely also in the detector.

Component and System Tests

The Optoboard test setup firmware is available on gitlab. Both BER tests of the VTRx+ as well as configuration of the components are done with this firmware using a KC705 FPGA board.

The code for the Optobox temperature and humidity monitoring using Arduino's is available on gitlab.

Implementation of Grounding and Shielding Specification

The grounding and shielding of the optoboxes has to follow the ATLAS ITk Grounding and shielding specification document (see EDMS document AT2-I-EP-0001).


The entire optobox has to be surrounded by a Faraday cage, which is connected to the main Faraday cage of the ITk detector. This forms a Faraday cage extension. A good DC and AC tie is required between the extension and the main Faraday cage.

The Faraday cage extension of the Optobox will be an additional cover going around an entire location. Following elements make part of the Faraday cage extension:

  • The cooling plate on the back side at low Z
  • The Opto Patch Panel at high radius
  • The Twinax feedthrough at low radius
  • A U-shaped cover to close along the r-direction and at high Z
All the different elements have to be connected electrically together with a good AC and DC conntact. An EMI gasket might be necessary along the edges.

Opto Patch Panel

All the incoming cables have to be filtered. Therefore the opto patch panel includes connectors with integrated capacitors (e.g. Filtered D-Sub). The filter for DC lines (e.g. power and interlock) should have a capacitance of 1-10 nF, while the capacitance for AC signals (e.g. CAN) can be in the order of 0.1-1 nF. The connectors mounted in the patch panel require a 360 shield connection to the Faraday cage. Further the shield from the cable has to be connected 360 to the connector shield. The D-Sub connector is providing that, with the requirement that a proper EMI backshell is used.

The fibers have to penetrate the opto patch panel. This is done by small cutouts. These cutouts have to respect the shielding baseline described in the [[]G&S specification]]

Twinax shield

The twinax bundle from the detector can not be interrupted by connectors due to signal integrity. Also no filtering can be applied. Therefore the twinax cable run uninterrupted form PP0 to the optoboxes. They penetrate the main Faraday cage at PP1. From there a shield has to be routed around the entire cable bundle going to one optopanel. This shield must be connected at both ends (PP1 and the optopanel) and realised the DC and AC tie between the main Faraday cage and the Faraday cage extension. At the optopanel side, a dedicated wall is foreseen that has an opening for the entire cable bundle and provides the mechanical connection to the shield. A possible shiled for the cable bundle is given here: Zippertube Z-Shield


The ITk grounding point is a single connection of the main Faraday cage. Therfore, the Faraday cage extension of the optopanels including the shield of the twinax cable must be isolated and prevented to make any electrical contact to other systems.

Inside an optopanel, there is one common reference point (ground) which is also the Faraday cage. The power board is directly connected to the cooling plate, which is part of the faraday cage.

Optoboard System modularity/connectivity

The modularity of the Optoboard System can be found here. The base unit for the connectivity are the modules. Multiple modules are powered in series (Serial Powering Chain). Up to three such serial powering chains can be connected to one common Patch Panel 0 (PP0) and share a common ground. Different PP0's have different grounds. Therefore, one Optoboard should not service more than one PP0 according to Grounding and Shielding policy. It is however possible

Production plan

schedule, # of units

QA & QC (basic information)

Failure modes

Failing component Lost downlinks/uplinks/modules Other consequences? Replaceable? Acceptable failure rates
MOPS - No monitoring of output voltages and temperatures (except through interlock) Yes*, replace Powerbox  
bPol12V up to 16/48/15 No Yes*, replace Powerbox  
bPol2V5 up to 8/24/8 Need to disable corresponding bBol12V power? Yes, replace Optobox  
VTRx+ up to 8/24/8 No Yes, replace Optobox  
LpGBT Master up to 8/24/8 No Yes, replace Optobox  
LpGBT Slave up to 0/6/2 No Yes, replace Optobox  
GBCR up to 2/6/2 No Yes, replace Optobox  
Also talk about connector and cable issues here? *Powerbox replacability ?

Safety related information

E.g information on VTRx+ laser?

Documentation and useful links


Documents: The ATLAS ITk TDR:

The lpGBT manual link:

The GBCR specification:

PCB Schematics

Optoboard V0 schematics: G6347_lpGBT_TestPCB_V0_final.pdf

FMC adapter board schematics: G6347A_OB0_Adapter.pdf

FMC + SMA adapter board schematics: G6347B_OB0_Adapter_SMA_Schematics.pdf

Recent talks/presentations


LpGBT Test Schematic lpgbt.png
Topic attachments
I Attachment History Action Size Date Who Comment
PDFpdf 191016_OptoboxPowerConnectors.pdf r1 manage 928.5 K 2019-10-16 - 14:23 NiklausLehmann  
PDFpdf 211021_OptoboxPowerConnectors.pdf r1 manage 953.9 K 2019-10-22 - 08:22 ArminFehr  
PDFpdf BAT_VTRx+_Eye_Diagrams.pdf r1 manage 24378.4 K 2019-10-24 - 15:10 ArminFehr VTRx+ Eye diagrams
JPEGjpg Bern-twinax-irradiation-setup.jpg r1 manage 56.8 K 2019-10-30 - 15:38 MicheleWeber Irradiation setup at the cyclotron for twinax
JPEGjpg ConnectorBoard.jpg r1 manage 38.7 K 2019-12-03 - 12:12 NiklausLehmann Connector board CAD
PDFpdf DataTransmission_scheme.pdf r1 manage 82.3 K 2019-11-22 - 10:32 FranconiLaura Data transmission scheme
PNGpng DataTransmission_scheme.png r1 manage 189.8 K 2019-11-22 - 10:29 FranconiLaura Data transmission scheme
PNGpng DataTransmission_scheme001.png r1 manage 99.2 K 2019-10-04 - 15:36 ArminFehr Data transmission scheme
PDFpdf DataTransmission_scheme002.pdf r1 manage 42.9 K 2019-11-22 - 10:32 FranconiLaura Data transmission scheme _ v2
PNGpng DataTransmission_scheme002.png r1 manage 599.3 K 2019-11-22 - 10:28 FranconiLaura Data transmission scheme
PDFpdf DataTransmission_scheme_Opto_only.pdf r1 manage 54.8 K 2019-11-12 - 15:00 RomanMueller Same scheme but only with Optoboard system parts
JPEGjpg Data_transmission_chain_BERN.JPG r1 manage 5495.4 K 2019-10-30 - 10:39 ArminFehr ITk Pixel Data Transmission Chain Bern
JPEGjpg Fan-out.JPG r1 manage 4835.8 K 2019-10-04 - 10:33 ArminFehr  
PDFpdf G6347A_OB0_Adapter.pdf r1 manage 330.6 K 2019-10-24 - 15:03 ArminFehr FMC adapter board schematics
PDFpdf G6347B_OB0_Adapter_SMA_Schematics.pdf r1 manage 118.0 K 2019-10-24 - 15:03 ArminFehr FMC + SMA adapter board schematics
PDFpdf G6347_lpGBT_TestPCB_V0_final.pdf r1 manage 379.1 K 2019-10-24 - 14:59 ArminFehr Optoboard V0 schematic
PDFpdf GBCR2_Status_20191009_v1.pdf r1 manage 4172.6 K 2019-11-08 - 13:48 RomanMueller  
PNGpng ITk_End_plate_09_2019.png r1 manage 2508.9 K 2019-10-03 - 16:55 ArminFehr  
PNGpng LpGBT_downlink_frame.png r1 manage 212.7 K 2019-10-14 - 18:19 ArminFehr From
PNGpng MPO24_cable.png r1 manage 365.0 K 2019-10-17 - 10:34 ArminFehr Sample MPO24 cable from
PDFpdf MTP_Spring_Clamp.pdf r1 manage 106.8 K 2019-10-04 - 13:34 ArminFehr  
PDFpdf MT_Ferrule.pdf r1 manage 105.8 K 2019-10-04 - 13:34 ArminFehr  
PNGpng MT_MPO.png r1 manage 184.7 K 2019-10-04 - 13:38 ArminFehr  
PDFpdf MT_MTP_Adapter.pdf r1 manage 100.9 K 2019-10-04 - 13:35 ArminFehr  
JPEGjpg OPTO_Box_V1_Assembly.jpg r1 manage 60.2 K 2019-12-03 - 09:30 NiklausLehmann Optobox V1 CAD drawing
JPEGjpg OPTO_Box_V1_Assembly_open.jpg r2 r1 manage 108.9 K 2019-12-03 - 09:37 NiklausLehmann Optobox V1 CAD drawing open
JPEGjpg OPTO_Panel.jpg r1 manage 99.3 K 2019-12-03 - 09:53 NiklausLehmann CAD Drawing for opto panel
PDFpdf OptoBoard_V1_0_schematic.pdf r1 manage 2071.9 K 2019-11-11 - 17:13 NiklausLehmann Optoboard V0 schematic
Unknown file formatpptx OptoBoard_V1_20181009.pptx r1 manage 5013.5 K 2019-10-11 - 17:24 ArminFehr Optoboard V1 Update
PDFpdf OptoBoard_V1_20191016.pdf r1 manage 1298.1 K 2019-10-18 - 09:17 ArminFehr Optoboard Design Status
JPEGjpg OptoBoard_back.jpg r1 manage 51.7 K 2019-12-03 - 11:43 NiklausLehmann Optoboard CAD back
JPEGjpg OptoBoard_front.jpg r1 manage 77.1 K 2019-12-03 - 11:43 NiklausLehmann Optoboard CAD front
Unknown file formatpages Optoboard_System.pages r1 manage 278.9 K 2019-10-18 - 11:15 RomanMueller Source file for the power board connectivity
PDFpdf Optoboard_System_Status.pdf r1 manage 16914.8 K 2019-10-24 - 15:12 ArminFehr Optoboard System Status June 2019
JPEGjpg Optoboard_V0_Master_Slave_test.JPG r1 manage 6775.1 K 2019-10-30 - 09:40 ArminFehr Optoboard V0 test setup not marked
JPEGjpg Optoboard_V0_Master_Slave_test_marked.JPG r1 manage 6758.9 K 2019-10-30 - 09:40 ArminFehr Optoboard V0 test setup
PNGpng Optoboard_signal_paths.png r2 r1 manage 55.3 K 2019-10-18 - 10:40 ArminFehr Optoboard Signal Paths
PNGpng PowerBoard.png r1 manage 596.5 K 2019-12-03 - 11:45 NiklausLehmann Power board CAD
PDFpdf PowerBoard_schematic.pdf r1 manage 594.6 K 2019-11-11 - 17:12 NiklausLehmann Powerboard schematics
PDFpdf The_VTRx+,_an_Optical_Link_Module_for_DataTransmission_at_HL-LHC.pdf r1 manage 653.5 K 2019-11-08 - 14:30 RomanMueller Short paper on the VTRx+
PNGpng Twinax_dimensions_ITk_Week_Sep_2019.png r1 manage 51.0 K 2019-10-08 - 09:01 ArminFehr Su Dong's talk at ITk Week Sep. 2019:
PNGpng VTRx+_with_pigtail.png r1 manage 342.4 K 2019-10-04 - 10:38 ArminFehr From
PNGpng image_2019_10_16T09_44_40_606Z.png r1 manage 55.3 K 2019-10-18 - 10:39 ArminFehr Optoboard Signal Paths
PDFpdf ldq10_I2C.pdf r1 manage 221.1 K 2019-10-15 - 15:55 ArminFehr LDQ10 configuration description
PNGpng optobox_location.001.png r2 r1 manage 255.8 K 2019-10-11 - 12:07 ArminFehr Picture of Optoboxes in ITk End Plate location, with twinax and fiber cables. Use optobox_location.key to edit figure
PNGpng optobox_location.002.png r1 manage 97.6 K 2019-10-11 - 17:02 ArminFehr Picture of Optoboxes in-between LAr boxes, with twinax and fiber cables. Use optobox_location.key to edit figure
Keykey optobox_location.key r2 r1 manage 449.5 K 2019-10-11 - 12:07 ArminFehr Picture of Optoboxes in ITk End Plate location, with twinax and fiber cables.
PDFpdf powerboard_connectivity.pdf r1 manage 80.9 K 2019-10-11 - 12:21 ArminFehr Optoboard to Powerboard connectivity
PNGpng powerboard_connectivity.png r1 manage 561.3 K 2019-10-11 - 16:33 ArminFehr Optoboard to Powerboard connectivity
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