The idDAS MTDI is a Multi-Technology Digital Interface unit that digitizes and filters all the cellular carriers and sends them over CPRI links to the digital central hub of the system (MSDH). Each MTDI shelf consists of eight plug-in band-modules covering all frequencies. Each MTDI interfaces with up to two A-POI units and routes digitized services towards the MSDH. Thus, each MTDI can support up to 32 BTS sector ports. (The MTDI can also be connected directly to low power BTSs or small cells.)