In article ,
"rb" wrote:

Are RJ11 and RJ14 modular plugs the same size?

Yes.

Do they physically fit the same jack?

Yes.

The RJ14 jack can accommodate six conductors.

So can the RJ11 jack.

If you use a single line, four conductor phone cord (assumes a four
conductor plug) into an RJ14 jack, does it work OK (assumes the
device the jack is in is a single line phone?

Yes. That assumes the wiring is correct.

Will a two line, four conductor phone cord (assumes a four conductor
plug) work OK in an RJ14 jack (assumes the device the jack is in is
a two line phone)?

Yes.
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JR

Mean Evil Bell System
Historical Society