An adapter housing for receiving a plurality of multi-fiber connectors, the adapter housing comprising: a rectangular, box-like housing structure having opposing side walls (24, 26) and a back wall; and a bank of adapters comprising at least one grouping of a plurality of adapters, wherein each adapter is configured to receive two multi-fiber connectors (46, 48), wherein each adapter includes an adapter body having a first connector end for receiving one multi-fiber connector of the two multi-fiber connectors (46, 48) and a second connector end for receiving the other multi-fiber connector of the two multi-fiber connectors (46, 48), wherein the adapter body further includes a first minor sidewall, a second minor side wall, a first major side wall and a second major side wall that extend between the first and second connector ends (54, 56), and wherein each adapter is aligned side-by-side in the grouping with first and second major side walls (62, 64) of adjacent adapters facing each other, further comprising one or more shelves, the bank of adapters comprising multiple adapter rows, wherein at least one adapter row is supported by the one or more adapter shelves; characterized in that housing structure is adapted to mount in a 2-U space in an equipment rack, wherein the housing structure has a width of no greater than about 45,09 cm (17.75 inches) and a height of no greater than about 8,89 cm (3.50 inches); the bank of adapters comprises individual connector-adapter-connector locations of at least 200 adapters configured to receive up to 2400 connector pairs within the housing structure, wherein the adapter housing includes five adapter rows, wherein each adapter row includes at least 40 individual connector-adapter-connector locations, wherein the individual connector-adapter-connector locations are configured to receive MTP-type connectors (46, 48), wherein the multi-fiber adapter is configured to receive a multi-fiber connector comprising at least 12 optical fibers, wherein a connector channel extends between the first connector end and the second connector end, wherein the multi-fiber adapter is configured to receive the MTP-type connectors (46, 48) within the connector channel, wherein the adapters of the grouping are formed together as an integral group. a rectangular, box-like housing structure having opposing side walls (24, 26) and a back wall; and a bank of adapters comprising at least one grouping of a plurality of adapters, wherein each adapter is configured to receive two multi-fiber connectors (46, 48), wherein each adapter includes an adapter body having a first connector end for receiving one multi-fiber connector of the two multi-fiber connectors (46, 48) and a second connector end for receiving the other multi-fiber connector of the two multi-fiber connectors (46, 48), wherein the adapter body further includes a first minor sidewall, a second minor side wall, a first major side wall and a second major side wall that extend between the first and second connector ends (54, 56), and wherein each adapter is aligned side-by-side in the grouping with first and second major side walls (62, 64) of adjacent adapters facing each other, further comprising one or more shelves, the bank of adapters comprising multiple adapter rows, wherein at least one adapter row is supported by the one or more adapter shelves; characterized in that housing structure is adapted to mount in a 2-U space in an equipment rack, wherein the housing structure has a width of no greater than about 45,09 cm (17.75 inches) and a height of no greater than about 8,89 cm (3.50 inches); the bank of adapters comprises individual connector-adapter-connector locations of at least 200 adapters configured to receive up to 2400 connector pairs within the housing structure, wherein the adapter housing includes five adapter rows, wherein each adapter row includes at least 40 individual connector-adapter-connector locations, wherein the individual connector-adapter-connector locations are configured to receive MTP-type connectors (46, 48), wherein the multi-fiber adapter is configured to receive a multi-fiber connector comprising at least 12 optical fibers, wherein a connector channel extends between the first connector end and the second connector end, wherein the multi-fiber adapter is configured to receive the MTP-type connectors (46, 48) within the connector channel, wherein the adapters of the grouping are formed together as an integral group.