The SDX 6320 can be aggregated using high-density aggregation systems including ADTRANft. s SDX 8200 and 8300 Series aggregation switches or used directly as stand alone OLTs. This SDX 6320-16 includes redundant DC power feeds with side to side airflow and 4xQSFP28 100G and 4 x SFP+ 10G interfaces for uplink. Optics sold separately. This unit is designed to into cabinets and CO racks including 19in. ETSI and 23in. racks. This SDX 6320-16 includes a field replaceable fan tray. XGS-PON GPON and COMBO PON optics are sold separately.