The standard MTP brand/MPO adapter is what you'll find in the back of any MTP/MPO cassette. You'll also find them in a 4- or 6-pack MTP brand/MPO adapter panel. It essentially allows you to connect two MTP/MPO cable assemblies together (male and female). Standard MTP brand/MPO adaptors are usually black whereas secure MTP brand/MPO adaptors have several different colors in order to match connectors with adaptors. If you want a longer MTP brand/MPO run, try using a adapter, but you'll need male (pinned) and female (unpinned) connectors to accomplish it.