Isn't this a T43/p? See the T43/T43p page & observe the model numbers.
No it is not. T43/p is not the same as T43p
T43/p means the page applies to both the T43 and T43p model. Please look at tabook.pdf for actual model details and you can see that the 2668-C2U is a T43
I'll take your word for it. Sorry for the reverts. Does anyone know why the 1XXX models are only T43 & the 2XXX modes are listed as T43/p? 
What is the difference between a 1XXX series T43, a 2XXX series T43, and a 2XXX series T43p?