Nortel Media Gateway 4000 spans TDM and ATM domains by accepting TDM trunk signaling and translating the output into ATM formats. The TDM-to-packet gateway can reduce tandem/transit trunking congestion and help lower network operating costs. This gateway uses open system interfaces, offering both high-speed (OC-3/STS-1) and low-speed (DS-1) access, with an OC-3c interface to the ATM switching fabric.

• Delivers scalable trunking capacity
• Enables a smooth transition to a broadband network
• Supports switched virtual circuits (SVCs)
• Facilitates delivery of IP end-to-end services
• Significantly reduces cost of ownership