Transition Networks SGPAT10xx-x05 PoE+ Converter User Guide
33719 Rev. C https://www.transition.com Page 19 of 49
Remote Fault Detect (RFD)
The RFD feature applies to 1000Mbps operation only. Remote Fault Detect (RFD) is a troubleshooting feature
found on Gig Ethernet copper-to-fiber media converters. By enabling RFD on the remotely located media
converter, the status of the fiber link will be monitored and any link failures will be reported back to the local
converter. If the remote converter loses its fiber RX signal, RFD will force the converter to shut down its fiber TX
port. If Link Pass Though is enabled on both ends, then the copper ports will also be shut down to notify both
end devices of the link failure. (With Remote Fault Detect enabled, if the converter only loses an RX Fiber signal,
LPT will still notify both linked devices.)
Auto Power Reset (APR)
During an Active Link Pass Through event, the Auto Power Reset feature will re-set the power to the end PD
device, ensuring it is ready to go when the LPT event is corrected. When a fiber port loses link, the PoE power
will be cycled on the copper (TP) port.
Auto Power Reset requires both Dual Converter mode and ALPT mode to be enabled. Also, there are timers that
must complete before a first ALPT event can trigger a power-reset and also before subsequent ALPT events can
trigger subsequent power resets. The timers prevent link flapping on devices where the link goes up and down
during the boot process.
Active Link Pass Through (ALPT)
Active Link Pass Through (ALPT) is supported, which is an automatically activated version of Link Pass Through
(LPT) that allows the converter to detect the loss of Receive (Rx) signals on either fiber or copper port and
propagate the failure to the end devices, preventing the media converter from isolating those link failures.
During an ALPT event, the Auto Power Reset feature will re-set the power to the end PD device, ensuring it is
ready to go when the ALPT event is corrected.
Note: ALPT is only operational in specific modes or ports counts; see DIP switch description for details).
Link Pass-Through is a troubleshooting feature that allows the media converter to monitor both the fiber and
copper RX ports for loss of signal. With the loss of RX signal on one media port, the converter will automatically
disable the TX signal of the other media port, thus “passing through” the link loss. With LPT, the end device
automatically notified of link loss; this helps prevent loss of valuable data unknowingly transmitted over invalid
link.
Active LPT is a form of LPT that requires the links to become Active before LPT becomes Active. ALPT has two
states: Diagnostic and Active. The media converter enters the Diagnostic state when either of the following
conditions is met:
Upon power-up of the converter.
Upon removing the converter’s SFP module (if equipped).
In the Diagnostic state, the link for each of the media converter’s ports can come up independently of each
other, just like a converter that has no LPT functionality, or a converter that has LPT is disabled. The Diagnostic
state is helpful during first power up, before all links of a circuit are connected, as it allows the installer to see
each link turn on as the cables are plugged in. It’s also helpful for finding the location of a fault, if one exists.
The media converter remains in the Diagnostic state until the link status for both of the media converter’s ports
are up, simultaneously.
To Next Page
Loading...
