This unit installs a 10/107G optical interface in the MP1590B and MP1591A. Previously, both the MU150121A 10/10.7G Optical Unit (Tx) and the MU150122A Optical Unit (Rx narrow) were required to install a 10/10/7G optical interface in the MP1590B and MP1591A, but now the MU150135A uses an XFP transceiver to support both Rx and Tx with one unit, cutting equipment costs and saving space too.
