I ran two cat 5 cables from my computer room to my tv room, don't ask. I have been using a temporary cable across the carpet and it runs perfectly. The pinouts on the temporary and permanent wires are correct. yes 100% correct for a straight cable. All I can put it down to is that this 40 metre length of cable in the wall is of poor quality. I have just ordered two ready made 40 metre leads, CAT 6 (yes CAT 6 with the shielding). What is your opinion?