2-7
Wall-Mounting Installation
Follow these steps to mount the unit to a wall or other flat surface.
1. Use a screwdriver to remove the two screws that secure the DIN-Rail clip to the back of the
switch.
2. Use a screwdriver to attach the wall-mounting plate to the rear panel of the switch using the
six screws provided. Tighten these screws to secure the switch to the wall-mounting plate.
3. Use the slotted holes at each corner of the wall-mounting plate to attach the unit to the wall
or other flat surface.
4. To remove the unit from the wall and from the wall-mounting plate, reverse steps 1-3.
Setting Up a Redundant Media Ring
This switch supports a simplified, plug-n-play, redundant media ring methodology that can
accomplish media fail-over recovery in less than 300ms, helping to secure communications with
critical network devices. This algorithm is similar to the Spanning Tree Protocol (STP) and Rapid
Spanning Tree Protocol (RSTP), but with a much faster recovery time.
To keep things simple, redundant ring operation utilizes ports 7 and 8 of this model. When
interconnecting these switches to complete a loop, all switches must use ports 7 and 8, and all
switches in the loop must be of the same type (have the same redundant ring method). Only one
switch should be set to Ring Master.
When you complete a media loop, the Ring Master switch will automatically sense the presence
of the loop, disable the second message path (block it), and hold it as a backup path should the
primary path fail. If the primary path later fails, the Ring Master switch will switch communications
to the redundant backup path within 300ms. Note that ports 7 and 8 operate identical to the other
ports when the loop switches are not connected in a loop. You are not required to enable or
disable the redundant ring function, as its operation is automatic. You are only required to set
one of the loop switches to Ring Master by setting its “RM” DIP switch to ON. The Ring Master
will be responsible for negotiating and sending commands to the other switches in the ring to
manage the redundancy. If there happens to be more than one switch in the same ring that is set
to be the Ring Master, the switch with the smallest MAC address range will be automatically
selected as the Ring Master. Optionally, you can enable or disable the port alarm for each port of
the switch with its other DIP switches. In this way, you can signal that a path has failed via the
SPST alarm relay contacts, which will close upon alarm. Note that the alarm relay contacts will
also close for a failure at input power 1 and/or 2, or when the unit is not powered.
