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A typical failover application where a redundant or backup connection is required would have the host device
connected to one of the “C” ports, with the normal network connection to the respective “B” port, and the
failover network connection to the respective “A” port. The 2U Auto Bypass Switch provides two separate
A/B switching elements, so two separate host devices can be connected to their own “normal” and “failover”
network ports. However, if the auto bypass/recovery functions of the 2U Auto Bypass Switch are used, both
devices will be simultaneously switched between their normal and failover connections when the auto bypass
or the auto recovery switching functions occur.
4.4
Connect a 12VDC power supply to either power supply connector. If you are using redundant power
supplies, connect one to each power supply connector. Apply AC power to (each) power supply. The
indicators, PS1 and PS2 on the front of the unit will indicate when each power supply is energized. The
switch position indicators (A and B) on the front of the unit will light depending on the position of the A/B
switching elements within the 2U Auto Bypass Switch. LED A lights when the switching elements in the 2U
Auto Bypass Switch are in position A, and LED B lights when the switching elements within the 2U Auto
Bypass Switch are in position B.
4.5
Before you connect the 2U Auto Bypass Switch’s Ethernet remote control port to your Ethernet network, you
must first configure the 2U Auto Bypass Switch TCP/IP related parameters. You should set these parameters
before attaching to your network as the default parameters may not work or could interfere with your
network. See Section 3 for a list of the TCP/IP parameters that need to be configured.
4.6
Once the TCP/IP parameters have been configured, connect the NETWORK port on the 2U Auto Bypass
Switch to your layer 2 switch, HUB, or router. If using the 2U Auto Bypass Switch auto bypass/recovery
switching functions, this same layer 2 switch/HUB/router should also be connected to the appropriate switch
ports on the 2U Auto Bypass Switch in order to create the required normal and/or bypass paths through the
2U Auto Bypass Switch, and to allow the PING packets from the internal Ethernet node on the 2U Auto
Bypass Switch to travel to the desired external Ethernet node on the user’s network. If your network is fiber
optic based, you will need a media converter to convert the 10Base-T signals of the Auto Bypass Switch
NETWORK port to fiber optic Ethernet signals.
Typical Failover Configuration
L2 or L3
Switch
Network Switch
/ Back-up servers
SW1021A
B1
B2
C1
C2
A1
A2
Network
Port
Network switch
/ Primary servers
(Failover network)
Users
Note: The SW1021A Auto bypass switch PINGs an IP
address on the primary network to detect a network path
failure.
NORMAL
BYPASS
