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# Multi-pin Connectors for use on FMC front panels
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-----
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## Requirements
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The connector type for a multi-pin connector for use on FMC cards has
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the following requirements:
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- Must be a standard
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- PCB mounted connector 9.5mm height max. Up to 40mm width preferred
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- Lock or thumbscrew mechanism to fix cable to connector
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- Halogen-free cable (a hard CERN requirement)
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- Twisted pairs, 10 or more
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- also available in an individually shielded version (twinax) to
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be able to use in sensitive analog applications
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-----
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## Possible solutions
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### CameraLink - [Wikipedia](http://en.wikipedia.org/wikis/Camera_Link)
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- 26-pin connector
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- 11 individually shielded twisted pairs (twin-ax pairs)
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- 4 shield connections
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- Cable assembly fixed to connector with screws
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- [Example of a non-halogen-free
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cable.](http://fr.farnell.com/3m/14t26-szlb-100-olc/serial-cable-assembly/dp/1345142)
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- Remark: let us know if *you* are interested in participating in
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purchasing a large quantity of halogen-free
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cables.
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- Vendors
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- [3M](http://solutions.3m.com/wps/portal/3M/en_US/electronics/home/productsandservices/CameraLink/)
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- *Issues to obtain this cable in a halogen-free version.*
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Erik is in contact with 3M about this (June 2010).
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- Have at CERN samples of
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- [14T26-SZLB-0LC High-speed MDR cable
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assembly](http://multimedia.mmm.com/mws/mediawebserver.dyn?6666660Zjcf6lVs6EVs666_gqCOrrrrQ-)
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(add a '-' at end of link in browser: wikis problem)
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- N10226-5215-PC MDR connector 26p., Boardmount Thru-Hole
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Right Angle (about 36mm wide)
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- Special productions may have 13 individually shielded
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twisted pairs.
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- No flat-cables for this connector exist (3M, 16/7/10).
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- Clips-shells are preferred by 3M. Camera link standardises
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on fixing shells with
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screws.
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- [Cicoil](http://www.cicoil.com/cables/product.asp?idCategoryId=5&idSeriesId=9&idProductId=13#get-quote)
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- Halogen-free, LSZH.
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- Special: flatcable.
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- [Loram Cable
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Connection](http://www.cable-connection.com/link_cables.html) -
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Erik asked if can be halogen-free (July 2010).
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- [OCP](http://www.ocp.com/machinevision/camera_link.html) (is
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[Specialty
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cables](http://www.specialty-cables.com/camera-link-cable-specs.html))
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- Can build custom version in LSZH. Will receive quote (July
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2010).
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- Recommends thumbscrew version as is much more secure.
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- Requested for quote (31/7/10 - 6/9/10)
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- [Northwire](http://www.northwire.com/assembly_CLstd.php)
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- Can produce cables with outer jacket in LSZH.
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- Standard cables are flame retardant, but not halogen-free.
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- Can produce cables using 13 twinax pairs.
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- Erik has received a sample of standard cable and a quote
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(August 2010).
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- [Technical Cable
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Concepts](http://www.techcable.com/HTML/camera-link.htm).
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- Received quote for special LSZH assembly (14/9/10).
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-----
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## Not retained possibilities
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- [OpenLDI](http://en.wikipedia.org/wikis/OpenLDI)
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- OHR thread on
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http://lists.ohwr.org/sympa/arc/fmc-dio-16chttla/2010-03/msg00000.html
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- not easily available, outdated
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standard.
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<!-- end list -->
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- [VHDCI](http://www.cablesondemand.com/pcategory/64/category/CSVHDCI/URvars/Catalog/Library/InfoManage/SCSI_-_VHDCI_CABLES.htm)
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- Not available in halogen-free.
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- Cheap (30$ for 2 meters long cable), standard & popular
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- 34 twisted pairs with overall shielding. Not individually
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shielded.
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- small connector with mounting screws
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- not sure if cable with individually shielded pairs is easily
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available (besides the National Instruments: [NI high
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performance
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cables](http://sine.ni.com/nips/cds/view/p/lang/en/nid/201628))
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<!-- end list -->
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- PCI Express cable
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- [PCI-SIG
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standard](http://www.pcisig.com/specifications/pciexpress/pcie_cabling1.0/)
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- [PCI Express® External Cabling
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Specification](http://cdsweb.cern.ch/record/1247944?ln=en) -
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CERN only
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- Only overall shield (see section 6.3 of the specification)
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- Likely not available in halogen-free
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-----
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Erik van der Bij, Maciej Fimiarz - 15 September 2010.
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### Files
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* [3M_MDR_connector.pdf](/uploads/036ba8c67916bb63eb83be9d6363e28d/3M_MDR_connector.pdf)
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* [3M_3341-31_MDR_screw.pdf](/uploads/9d870a60dc05a984666cc8f975254ae0/3M_3341-31_MDR_screw.pdf) |
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