I have a 10Gb link that is a little over 10Km. I'm using X2-10G-ER transceivers and WS-X6K-5DB-ATT= attenuators. The documentation says to put teh attenuators on the RX side on each end. But purely for convenience and ease of installation I would like to put both attentuators on the same switch - one on the RX and one on TX. Does it make any difference really if I put the attenuator at the TX end or RX end of the fiber?