A fiber optic apparatus, comprising: a chassis for supporting a plurality of fiber optic components ; an equipment rack on which the chassis is mounted, wherein the equipment rack has one or more spaces for mounting the chassis , and wherein a space that has a width dimension of 48.26 cm or 58.42 cm and a height dimension of 4.45 cm is a 1-U space; up to three fiber optic equipment trays disposed in the height of the 1-U space; tray guides disposed in the chassis , wherein each of the up to three fiber optic equipment trays includes tray rails that are configured to be received in the tray guides , and wherein up to three fiber optic equipment trays can be independently moved about the tray guides in the chassis in the 1-U space; each fiber optic equipment tray supporting one or more fiber optic modules , and each fiber optic module supporting a plurality of the fiber optic components ; wherein each of the fiber optic modules has a height H such that three fiber optic modules can be disposed in a 1-U space height, each of the fiber optic modules having a main body and cover , and an internal chamber disposed inside the main body and the cover and in which a fiber optic cable harness is received; and the plurality of fiber optic components is disposed in the chassis in a configuration that provides for at least one hundred forty-four fiber optic connections in the 1-U space, based on using at least one simplex fiber optic component or duplex fiber optic component, or in a configuration that provides for at least five hundred seventy-six fiber optic connections in the 1-U space, or at least one thousand one hundred fifty two fiber optic connections in the 1-U space, based on using at least one multiple fiber component, wherein the at least one multiple fiber component is comprised of at least one twelve fiber connector, at least one twelve fiber adapter, at least one twenty-four fiber connector, or at least one twenty-four fiber adapter. a chassis for supporting a plurality of fiber optic components ; an equipment rack on which the chassis is mounted, wherein the equipment rack has one or more spaces for mounting the chassis , and wherein a space that has a width dimension of 48.26 cm or 58.42 cm and a height dimension of 4.45 cm is a 1-U space; up to three fiber optic equipment trays disposed in the height of the 1-U space; tray guides disposed in the chassis , wherein each of the up to three fiber optic equipment trays includes tray rails that are configured to be received in the tray guides , and wherein up to three fiber optic equipment trays can be independently moved about the tray guides in the chassis in the 1-U space; each fiber optic equipment tray supporting one or more fiber optic modules , and each fiber optic module supporting a plurality of the fiber optic components ; wherein each of the fiber optic modules has a height H such that three fiber optic modules can be disposed in a 1-U space height, each of the fiber optic modules having a main body and cover , and an internal chamber disposed inside the main body and the cover and in which a fiber optic cable harness is received; and the plurality of fiber optic components is disposed in the chassis in a configuration that provides for at least one hundred forty-four fiber optic connections in the 1-U space, based on using at least one simplex fiber optic component or duplex fiber optic component, or in a configuration that provides for at least five hundred seventy-six fiber optic connections in the 1-U space, or at least one thousand one hundred fifty two fiber optic connections in the 1-U space, based on using at least one multiple fiber component, wherein the at least one multiple fiber component is comprised of at least one twelve fiber connector, at least one twelve fiber adapter, at least one twenty-four fiber connector, or at least one twenty-four fiber adapter. <EOS>