Toslink 5 mm or 2.2 mm

[Dragonchaser]

I'd like to hook up my TV to my digital speaker (I checked with manufacturer, it works).

I wanted to buy a Toslink but then I noticed there are 2 sizes: toslink 5 mm or 2.2 mm.

Which one should I get or how can I find out?

[redwudz]

I could be wrong, but the 5mm and 2.2mm seem to refer to the cable diameter, not the connectors. That shouldn't have much, if any affect on data transfer.
There is a mini-Toslink connector that resembles a 3.5mm plug, but it's not common. All optical devices I've worked with use a standard Toslink connector.

A Wikipedia article on Toslink: https://en.wikipedia.org/wiki/TOSLINK

[Dragonchaser]

I could be wrong, but the 5mm and 2.2mm seem to refer to the cable diameter, not the connectors.

Thank you so much, redwudz!

I saw the Wikipedia article:

Several types of fiber can be used for TOSLINK: inexpensive 1 mm plastic optical fiber, higher-quality multistrand plastic optical fibers, or quartz glass optical fibers, depending on the desired bandwidth and application.

I had presumed it was the thickness of the cable but 5 mm is 1/5 of an inch. Seems like an awful lot to me.

[redwudz]

I just took a look at one of my fiber optic audio cables and it is about 5mm in outside diameter.

I've worked around the fiber optic cables used by the phone company and they used a single glass thread of less than 1mm with just a surface coating for 'insulation'. The threads were bundled into a six bundle and there were six of them for 36 fibers. The whole cable with covering was a bit more than 1/2 inch in diameter.

[pandy]

Toslink use 1mm plastic fiber (as stated in Wikipedia) and rectangular/trapezoidal shape plug, 3.5mm jack is not Toslink (but anyway it is widely accepted in mobile world). external diameter have no meaning except maybe esthetically and maybe mechanical reasons.