Black Box LE2700A, User Manual, Page: 22 / 154

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Page 22
Chapter 3: Hardware Installation
3.4.2 SFP
The switch comes with fiber optical ports that can connect to other devices using SFP modules. The fiber optical ports are in
multimode (0 to 550 m, 850 nm with 50/125-µm, 62.5/125-µm fiber) and single-mode with LC connectors. Remember to
connect the TX port of Switch A should be connected to the RX port of Switch B.
Figure 3-9. Fiber optic ports.
3.4.3 B-Ring/B-Chain
B-Ring
You can connect three or more switches to form a ring topology to gain network redundancy capabilities through the following
steps.
1. Connect each switch to form a daisychain using an Ethernet cable.
2. Set one of the connected switches to be the master and make sure the port setting of each connected switch on the
management page corresponds to the physical ports connected. For information about the port setting, please refer to
Section 4.1.2, Configuration.
3. Connect the last switch to the first switch to form a ring topology.
B-Ring
Figure 3-10. B-Ring.
Coupling Ring
If you already have two B-Ring topologies and would like to connect the rings, you can form them into a coupling ring. All you
need to do is select two switches from each ring to be connected, for example, switch A and B from Ring 1 and switch C and D
from ring 2. Decide which port on each switch to be used as the coupling port and then link them together, for example, port 1
of switch A to port 2 of switch C and port 1 of switch B to port 2 of switch D. Then, enable Coupling Ring option by checking
the checkbox on the management page and select the coupling ring in correspondence to the connected port. For more
information on port setting, refer to Section 4.1.2, Configuration. Once the setting is completed, one of the connections will act
as the main path while the other will act as the backup path.