Here are some more information for Ports Switch:

Uninterruptible Power Supply - Automatic And Static Transfer Switches

Automatic Transfer Switches (ATS) are designed to provide resilience in power continuity planning and uninterruptible power supply (UPS) implementations below 10kVA, where UPS cannot be operated in parallel.

Static Transfer Switches are relay-based and can be used in place of PDUs (Power Distribution Units) for plug-and-play loads. Care has to be taken with such devices to ensure a single-point-of-failure is not introduced on the output side of the uninterruptible power supply. Each device is fused or protected by a circuit-breaker and should it open or rupture the load could potentially be dropped. 

Automatic Transfer Switches contain two ac input power sources (A) and (B). One possible mode of operation is that Power source (A) can be supplied from the output of a UPS and (B) from a mains power supply. Another is that both (A) and (B) are supplied from two separate uninterruptible power supply outputs. Another alternative is that both are supplied from two separate mains power supplies.

When one of the power supplies fails, the load/s are automatically transferred to the second. When the two supplies are in phase with one another, the transfer is instantaneous.

 In addition, an Automatic Transfer Switch can provide protection against load short—circuits, the ability to switch its output power connections on and off remotely (over a network) and load measurement locally via an LCD or built-in sub-D type communications port. ATS can also be hardwired for higher operating power.

 This article was compiled using information available in The Power Protection Guide – the design, installation and operation of uninterruptible power supplies (ISBN: 9 780955 442803). By Robin Koffler and Jason Yates of Riello UPS.

About the Author

Robin Koffler is the General Manager for Riello UPS Ltd the UK subsidiary of Riello UPS (RPS S.p.A) a leading European manufacturer of Uninterruptible Power Supplies and a co-author of The Power Protection Guide(ISBN 978-0-9554428-0-3)- available from Amazon.com

how to set up 2 wan into a 24 port switch?Is there a possibility of conflict between this 2 wan?

I have to set up an internet cafe with 2 dsl connection which is already routed into a 24 port switch or more, is it possible to do this?how should i do it?

It appears that you have a DSL connection with a router and it is networked to a 24 port switch. You want to add another DSL connection with a router and network it with the same 24 port switch.

Yes...you can do just that, however the network computers on one DSL connect will have to route over the WAN to talk to the other. Any number of networks can use the same switch. IP devices know how to send/receive data base on their subnet and data being sent to a different subnet that has no known path (route) is sent to the default gateway (usually a router to the internet) to look for the subnet.

You could do this with ONE router from Cisco (model 1812) that has multiple WAN ports and a single LAN port. This router can then be setup to do load balancing. If you want to keep the subnets separate, you just assign both subnets to the LAN interface and you can still plug it in to the 24 port switch.

Users lament state of Ethernet
Network World - SAN JOSE -- Vendors have a lot more work to do to make Ethernet ready for large-scale data center duty. According to users at the Ethernet Technology Summit here this week, Ethernet could be a lot greener and "fabric-friendly."

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