Understanding the Functions of the SRX240 Services Gateway with Integrated Convergence Services
The SRX240 Services Gateway with Integrated Convergence Services functions as follows:
- Analog telephones and fax machines are directly connected to the SRX240 Services Gateway with Integrated Convergence Services through Foreign Exchange Station (FXS) interfaces.
- The telephone exchange or PSTN central office (CO) is directly connected to the SRX240 Services Gateway with Integrated Convergence Services through Foreign Exchange Office (FXO) interfaces.
- The media gateway converts analog signals from FXS and FXO ports and digital TDM signals from T1/E1 ports to VoIP packets and sends them to the network after processing through JUNOS Software secure routing and firewall flows. Similarly, the media gateway receives forwarded VoIP packets from the network, converts them into analog signals or digital TDM signals, and sends them across the appropriate interface.
- The media gateway also provides power failover support
in the event of power loss by providing a hardware relay between the
built-in FXS2 port and FXO1 port, which automatically connects the
two ports when the media gateway loses power.
Note: The 2-Port FXS/2-Port FXO Mini-PIM and the 4-Port FXO Mini-PIM do not support failover relay between any of the FXS and FXO ports.
- Telephony interface expansion available through Mini-PIM
interface card options includes a 2–Port FXS/2–Port FXO
Mini-PIM, a 4–Port FXO Mini-PIM, and an IP Flex T1/E1 Mini-PIM
with initial support for T1-CAS (loopstart only).
Note: For more information on Mini-PIMs, see the SRX Series Services Gateways for the Branch Physical Interface Modules Hardware Guide.
