Dell PowerConnect J-SRX240, Hardware Manual

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Understanding the Functions of the J-SRX240 Services Gateway with Integrated
Convergence Services on page 31
Understanding the Functions of the J-SRX240 Services Gateway with Integrated
Convergence Services
The J-SRX240 Services Gateway with Integrated Convergence Services functions as
follows:
• Analog telephones and fax machines are directly connected to the J-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
J-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 J-SRX Series Services Gateways for
the Branch Physical Interface Modules Hardware Guide.
Related Topics Introducing the J-SRX240 Services Gateway with Integrated Convergence Services on
page 29
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Configuring the J-SRX240 Services Gateway with Integrated Convergence Services on
page 32
J-SRX240 Services Gateway with Integrated Convergence Services Interoperability
The J-SRX240 Services Gateway with Integrated Convergence Services aligns with open
convergence architecture and supports different brands of call servers and SIP phones.
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Chapter 5: J-SRX240 Services Gateway with Integrated Convergence Services