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4. Installation
4.1
Find a location suitable for installing the 2U Auto Bypass Switch, with access to AC power outlets and the
connections you intend to switch through the unit.
4.2
If you intend to use serial control, connect to the RJ11 Gang In RS232 console port using the supplied DB9 to
RJ11 adapter and RJ11 to RJ11 crossover cable. The data rate and format is fixed at 9600 bps, no parity, 8
data bits, and 1 stop bit. See Table 3.2.3 for the RJ11 Gang In port connector pin assignments.
4.3
There are two sets of A/B switch cards per each “path group” within the 2U Auto Bypass Switch. Connect
RJ45 cables or multi mode fiber cables between the 2U Auto Bypass Switch and the devices/network
connections that you intend to switch. The 2U Auto Bypass Switch connects each C (common) port to either
the respective A port or B port for both switching elements. Telecommunications relays and optical switch
mechanisms are used to make these connections between ports, which makes the 2U Auto Bypass Switch
completely transparent to data formats, rates, protocols, etc. Note that the switch provides straight through
RJ45 connections. If your application requires a cross-over cable, use only (1) RJ45 cross-over cable in that
path. Use a straight through RJ45 cable on the other side of the switch. And since non-latching relays are
used in the 2U Auto Bypass Switch, the A-C connection state is typically used for the bypass or failover path
connections, and the B-C connection state is used for the normal path connections.
For example, in Intrusion Prevention System and similar applications, the two “A” ports on the 2U Auto
Bypass Switch are typically connected together with a short patch cable. The “B” ports on the 2U Auto
Bypass Switch are connected to the IN/OUT ports on the IPS. And the “C” ports on the 2U Auto Bypass
Switch are used to provide the connections between the firewall and the 2U Auto Bypass Switch, and
between the 2U Auto Bypass Switch and the first edge router/switch on the network. Thus when in the bypass
mode, data will flow between the firewall and one of the “C” ports, thru the first “A” port to the second “A”
port, and then out the second “C” port to the edge router/switch. And when in the normal mode, the data will
flow between the firewall and one of the “C” ports, thru the first “B” port to the IPS and then back from the
IPS to the second “B” port, and then out the second “C” port to the edge router/switch.
Typical IPS Configuration
Edge Switch
IPS
SW1021A
Firewall
B1
B2
C1
C2
A1
A2
Network
Port
IP & MAC address
Users
Optional
Failover
IPS
Note: The 2U Auto Bypass Switch
PINGs the firewall IP address thru the
edge switch, path C2 – B2, thru the
IPS and path B1 – C1 to detect a
network failure.
NORMAL
BYPASS
