With a six-slot modular chassis, including one T1/PRI Network Interface Module (NIM), a second NIM option slot, and four user option slots, the Atlas 550 is designed to improve and lower the costs of your voice/data, video and Internet communications. The Atlas 830 features an eight-slot modular chassis, including 2 T1/PRI ports and a 10/100BaseT Ethernet port, making it a powerful choice to reduce your overall telecommunication expenses.
         
Stand-alone ISDN service unit that connects data terminal equipment (DTE) to the ISDN network.