AMX Enova DGX 8 Instruction Manual page 106

Connecting Switching Systems with DXLink Fiber Connectors
Switching systems with DXLink Fiber support (i.e., Enova DGX Switchers) can be connected via their DXLink Fiber
ports.
Important: This section does not refer to the linking of enclosures from CPU to CPU, which is not supported
in the Enova DGX Switcher.
In an installation with a multiple-stage switching system, the following applies:
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* For example, the path through 3 switchers could be: source device Enova DGX 8 (out a DXLink Fiber port)
Enova DGX 32, DXLink Fiber input (out a DXLink Fiber port) Enova DGX 16, DXLink Fiber input (out a DXLink
Fiber port) DXLink Fiber Receiver display device as an HDMI signal.
Avoiding Network (Ethernet) Loops
Caution: Be careful not to create a network (Ethernet) loop.
Only one connection to a LAN is permitted within a switching system with DXLink Fiber support.* Network loops must
be avoided. A network loop is created when the enclosure and one or more DXLink Fiber units within the system are
connected to a common LAN. The Enova DGX Switcher does not support STP (Spanning Tree Protocol).
* This applies to systems with DXLink Fiber Boards and/or DXLink Twisted Pair Boards.
Example
In the example in FIG. 56, a network loop was created when an Enova DGX 16 was connected to a LAN and one of its
DXLink Fiber Transmitters was connected to the same LAN. The DXLink Fiber Transmitter needs to be disconnected
from the LAN. The same problem would also occur if an enclosure and one (or more) of its DXLink Fiber Receivers
were connected to a common LAN.
Source device
DXLink Fiber TX
FIG. 56
Avoid network loops
Instruction Manual – Enova DGX 8/16/32/64 Digital Media Switchers
When two switching systems with DXLink Fiber support are connected via their DXLink Fiber ports, only
video and audio will be passed through the DXLink Fiber connection.
When a DXLink Fiber input or output on one switching system determines that it is connected to a DXLink
Fiber input or output on another switching system, the DXLink Fiber port will automatically disable all
Ethernet and control on that connection port so that the only things passed down the DXLink Fiber line are
the video and audio signals.
When connecting switching systems via DXLink Fiber ports, AMX recommends no more than 3 switcher
throughputs.*
Network loops must be avoided (see below).
Enova DGX DXLink™ Fiber Boards, Duplex
LAN
Local Area Network
Enova DGX 16
LAN
connection
Destination device
106