Network Configuration
65
Instruction Manual – DXLink Fiber Transmitters and Receivers
Network Configuration
Overview
DXLink Fiber Transmitters and Receivers support two IP Addressing Modes: Static IP and DHCP (with link-local
fallback*).
To avoid having a large system consume numerous IP addresses, the Transmitters and Receivers default to disabling the
network connection functionality. Therefore, the #3 Toggle
must
be set to ON before the Transmitters or Receivers can
establish a network connection (see page 45).
When #3 Toggle is ON, the DXLink Fiber units are automatically placed in DHCP Mode, but they can be configured for
either of the IP Addressing Modes via two methods:
The front-panel ID Pushbutton (page 68)
Telnet commands (page 104)
*
“Link-local fallback” is a method by which an IP host, as a fallback from DHCP, can derive a local network-unique
IP address by negotiating with the other IP hosts on the same network. Link-local can also be used in its own right as the
primary method of IP address allocation. For details, see “DHCP Mode” below.
Static IP Mode – Default Parameters
DHCP Mode
DHCP Mode requires a connection (indirect) to a network with a DHCP server located on it. The Enova DGX Digital
Media Switcher (Endpoint Mode) can be connected to a DHCP server device; the DHCP connection is then propagated
through the system’s DXLink Fiber layer to the DXLink Fiber unit.
Important:
DHCP Mode will not function until the #3 Toggle on the DIP switch is set to ON (see page 45).
The #3 Toggle must be ON before the device is accessible via SEND_COMMANDs.
When in DHCP Mode (the default setting), the DXLink Fiber unit will attempt to get a DHCP lease (consisting of an
IP address, gateway, and other network parameters). Should the attempt fail, the unit will then configure itself for a
link-local address.
DXLink Fiber units utilize a modified link-local addressing procedure. The first address to be tried is a known
address in the link-local space: 169.254.2.2. That address will be probed, and if unclaimed will be used by
the DXLink Fiber unit.
If 169.254.2.2 is already claimed, the DXLink Fiber unit will choose a random address within the 169.254.x.x
link-local address space (again probing to ensure that it is unclaimed).
Once the unit is operating with a link-local address, it will periodically re-try DHCP and re-assign the IP address to a
valid DHCP grant if successful.
At any time, if the unit determines that its IP address has changed, it will disconnect from the Master (if necessary,
depending on the connection state) and then reconnect to the Master.
Default Parameters For Static IP Mode
Address
192.168.1.2
Netmask
255.255.255.0
Gateway
192.168.1.1
DNS1
192.168.1.1
DNS2
192.168.1.1
DNS3
192.168.1.1
