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AAC Access Concentrators have a flexible, modular architecture that allows you to choose the most cost-effective service for each application and manage them all from a single platform. The systems have three (AAC-2 ) or seven (AAC-3 ) user slots that can be filled with modules of your choice. Each slot contains a protocol module that determines the traffic type (cell, CBR, packet, or Ethernet) and a physical layer module that determines the physical interface. This is the Physical Layer module with DS3 port for AAC-2/AAC-3.