Specifications

About Avaya media servers and gateways
Issue 6 February 2007 23
● A duplicated control carrier that also contains the processor circuit pack(s). This type of
carrier is an option of the SCC1 Media Gateway and is used for the DEFINITY SI server
only.
● A port carrier that contains various port circuit packs and does not contain a processor.
The G600 and G650 Media Gateways are exclusively of this carrier type. The CMC1 and
SCC1 Media Gateways may also be of this type. The MCC1 Media Gateway can
simultaneously house this type of carrier along with other carrier types.
● An expansion control carrier that contains an IPSI or tone clock circuit pack and a
maintenance circuit pack. This type of carrier is an option when using expansion port
networks with a DEFINITY SI server. This carrier is also used in all SCC1 and MCC1
Media Gateways for connections to the server or to other media gateways in an S8500 or
S8700-series media server configuration.
● A switch node carrier that holds switch node interface cards to allow an S8700-series
media server to use the center stage switch configuration. Only an S8700-series media
server can support a center stage switch configuration and switch node carriers are one
type of carrier that can be simultaneously housed in an MCC1 media gateway.
The following media gateways all contain only one carrier:
● G600 media gateway
● G650 media gateway
● CMC1 media gateway
● SCC1 media gateway
The MCC1 media gateway contains multiple, up to five, carriers.
Common architectural aspects of media gateways for central
locations
A media gateway consists of the following architectural components:
● TDM bus. The TDM bus has 512 time slots. The TDM bus runs internally throughout each
media gateway and terminates on each end. The TDM bus consists of two 8-bit parallel
buses, bus A and bus B. Bus A and bus B carry circuit-switched digitized voice and data
signals. Bus A and Bus B can also carry control signals to all port circuits and between port
circuits and the SPE. The port circuits place digitized voice signals and data signals on a
TDM bus. Bus A and bus B are usually active simultaneously. However, only one bus is
active at any one time for control signaling.
● Packet bus. The packet bus runs internally throughout each media gateway and
terminates on each end. The packet bus carries logical links and control messages from
the SPE. The links and messages are carried through port circuits, to endpoints such as
terminals and adjuncts. The packet bus carries logical links for both on-switch and
off-switch control between some specific port circuits in the system. These circuits include,