Instruction manual

Network Configuration
66
Instruction Manual – DXLink™ Twisted Pair Transmitters/Receiver
Offline Recovery Mechanism for DXLink Devices
Offline Recovery Mechanism – A new, optional, recovery mechanism for DXLink Twisted Pair Transmitters and
Receivers in the rare occurrence that these devices move from online to offline status for an extended period of time.
The default setting for the recovery mechanism is OFF, but may be enabled for environments where the DXLink device
could lose connectivity to the Master for 5 minutes or longer.
Important: A reboot is required after setting the recovery mechanism before the new setting takes effect.
The following Telnet Commands enable, disable, and query the Offline Recovery Mechanism:
Set recovery mechanism to ON: WD ON
Set recovery mechanism to OFF: WD OFF
Query recovery mechanism’s current status: WD
Once the device’s recovery mechanism is set to the ON state via Telnet, the recovery mechanism monitors the ICSP
connection to the Master. The recovery mechanism is not armed until the DXLink device is brought online. Entering an
offline state triggers an internal timer in the DXLink device which, after 5 continuous minutes in the offline state, in turn
triggers the recovery mechanism to issue a full reboot command to the DXLink device. During this time the DXLink
device will reboot and all functions (including video and audio delivery) will be disabled while the reboot occurs. This
process takes up to 45 seconds to complete.
This functionality is an option intended to be a safety net for the rare occasions when a device falls offline and remains
there for a long enough period of time that the likelihood of the device coming back online on its own diminishes. The
reboot is intended to restart the device and allow it another opportunity to connect with the Master it is bound to.
Usage considerations include:
Once a device reboots, the recovery mechanism will not become armed again until the device reaches an
online state with a Master.
Because video is lost during the reboot process, consideration should be given to certain installation designs
where a Master or the network connection between the Master and a DXLink endpoint might regularly be
disabled or turned off, but video might continue to flow through the DXLink device. In these environments,
we recommend not enabling the Offline Recovery Mechanism.
Additional capabilities of recovery mechanism – Although highly unlikely, the recovery mechanism also
monitors the following states and provides a self-recovery mechanism if these states are ever encountered.
If a DXLink device processor enters an unstable processing condition
If the DXLink device’s allowable minimum memory threshold is exceeded