Regarding all the inputs i received for the request, here is a summary . POS card send laser to a specific wave length but used to have receivers with a large-band that include both 1310 and 1550 nm. . Wave length have nothing to do with laser power nor attenuators but 1550 nm frequency has better performance (less attenuation) in fiber. . Some people reported successful implementation with different wave-length on Cisco. . 1 guy reported successful implementation with Juniper / Cisco using oc48. (It was private mail, off-list) I will keep nanog-list informed for my own implementation !!! Thanks to everyone for the inputs. V