Nortel Networks 1000S Ethernet switch customer-supplied, Power over LAN optional, Infrastructure

Page 30 of 44 System architecture

The MG 1000S supports a Small System Controller (SSC) card and four slots for flexible configurations of line, trunk, and application cards.

Note: You can configure the SSC in the MG 1000S for survivability to assume local call processing if the Call Server cannot be accessed. If the MG 1000S is not configured as survivable, then the MG 1000S is out-of-service until the Call Server is again accessible.

Voice Gateway Media Cards are installed in the MG 1000S. A Voice Gateway Media Card provides transcoding between IP and circuit-switched protocol.

Each MG 1000S can support one MG 1000S Expander.

Ethernet switch (customer-supplied)

The customer-supplied Layer 2 Ethernet switch transmits data packets to interconnected Ethernet-attached devices. The switch directs the data only to the targeted device, rather than to all attached devices. See Data Networking for Voice over IP (553-3001-160) for details.

Power over LAN (optional)

An optional Power over LAN unit adds power and data communication over standard Category 5 LAN drops for powering IP Phones. The Power over LAN unit eliminates the need to connect each telephone to an AC power outlet. This saves in desktop wiring and enables the use of a centralized Uninterruptible Power Supply (UPS) for power backups.

Infrastructure

Various infrastructure components are required to support VoIP. These components include switches, routers, and MG 1000S. The data network infrastructure’s engineering and provisioning is critical to achieve satisfactory telephony voice quality. For more information, see Data Networking for Voice over IP (553-3001-160).

553-3031-010 Standard 3.00 August 2005