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The 3Com 3C10200B NBX V3000, V5000 Gateway Expansion Chassis includes four (4) universal slots, 2 resilient 10/100 uplink ports with failover support, 1 10 Mbps shared Ethernet Uplink port, an SSII Advanced Redundant Power Supply (RPS) uplink port, one auto-sensing 110/220 V, 50/60 Hz AC power supply & one (1) 8-foot power cord (country type must be specified on the order) and 19-inch rack-mounting ears.

• 3Com 3C10200B Gateway Expansion Chassis Sales Guide

• Supports up to 1500 devices (including up to 720 PSTN lines).
• Delivers integrated, simultaneous voice and data over the LAN and WAN.
• Built-in robust call processing, voice mail, computer telephony integration (CTI) and unified messaging.
• Standards-based architecture supports traditional PSTN connections and IP telephony protocols.
• User-friendly interfaces and web-based administration for easy and
  quick administrative and user programming.

• 3C10202 3Com SuperStack 3 NBX V5000 Chassis and Call Processor 250