Nortel Networks 1000S User Manual

 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. 

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.

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.

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).