Add MDC port type / cables

[Jokersmile4711]

NetBox version

v4.2.4

Feature type

Change to existing functionality

Proposed functionality

Add MDC port type and cables

Use case

There are new port types "mdc" on the market that we would like to map.

In addition, the appropriate patch cables with LC and MDC are required.

Database changes

No response

External dependencies

No response

[jeremystretch]

@Jokersmile4711 could you provide a link to the specification for this form factor please?

[Jokersmile4711]

@jeremystretch this is a specitifcation for the form factor MDC:
http://www.qsfp-dd.com/wp-content/uploads/2020/02/[MDC-Receptacle-Interface-Specification-Rev-4.pdf](http://www.qsfp-dd.com/wp-content/uploads/2020/02/MDC-Receptacle-Interface-Specification-Rev-4.pdf)

Additional, but not for my need, there is one more very small form factor - SN:
http://www.qsfp-dd.com/wp-content/uploads/2020/07/[SN-Receptacle-Specification-Rev1.1.pdf](http://www.qsfp-dd.com/wp-content/uploads/2020/07/SN-Receptacle-Specification-Rev1.1.pdf)

And, as usual with fibre, there are two different polishing methods, APC and UPC for each multimode and singlemode:
https://www.corning.com/catalog/coc/documents/product-family-specifications/LAN-2874-A4-DE.pdf -> page 3

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