Lantronix M M-GE-PSW-PSE-01 User Guide Rev C - Page 5

Feature Descriptions, Active Link Pass Through (ALPT), Auto Power Reset, Auto-Negotiation

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Lantronix M/GE-PSW-PSE-01 User Guide Feature Descriptions Active Link Pass Through (ALPT) The ALPT (Active Link Pass Through) function is a feature that disables Link Pass Through after the device has first powered up. ALPT allows the user to see the link status with only one media connected (either the Fiber or the Copper link). Once both media ports have established link or are active at the same time, the converter will automatically enable its Link Pass Though feature. The LPT feature now enabled will monitor the link status of each port. If either port's link status changes to down, the converter will disable the other port to indicate to the end device that the link partner is no longer communicating. The ALPT feature is permanently enabled. A power cycle to the device will disable the LPT feature again until both links are established. Auto Power Reset The Automatic Power Reset (APR) feature is enabled after the device has been powered for one minute and the ALPT feature is enabled. When both of these conditions are met, whenever the fiber link goes down due to the fiber partner link status or the ALPT forwarded copper link partner status, the converter will detect that the fiber link is down, disable the POE power for 5 seconds, and then allow the PSE to re-start power negotiation with a PD (powered device). After an APR event the converter will lock out the power reset feature for five minutes to allow time for the PD device to fully boot and re-establish link. When the five minute timeout is complete and the Fiber link has been reestablished, the APR functions will begin monitoring for the next fiber link down event. Circled in red above is the location of LED 4 that can be seen inside the metal. LED 4 will turn solid green when the APR function is enabled and is monitoring the fiber link. Auto-Negotiation The Auto-Negotiation feature is permanently enabled. Auto-MDI/MDIX The Auto-MDI/MDIX feature is permanently enabled. 33830 Rev. C https://www.lantronix.com/ Page 5 of 6

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Lantronix
M/GE-PSW-PSE-01 User Guide
33830 Rev. C
Page
5
of
6
Feature Descriptions
Active Link Pass Through (ALPT)
The ALPT (Active Link Pass Through) function is a feature that disables Link Pass Through after the device has
first powered up. ALPT allows the user to see the link status with only one media connected (either the Fiber or the
Copper link). Once both media ports have established link or are active at the same time, the converter will
automatically enable its Link Pass Though feature. The LPT feature now enabled will monitor the link status of each
port. If either port’s link status changes to down, the converter will disable the other port to indicate to the end
device that the link partner is no longer communicating. The ALPT feature is permanently enabled. A power cycle
to the device will disable the LPT feature again until both links are established.
Auto Power Reset
The Automatic Power Reset (APR) feature is enabled after the device has been powered for one minute and the
ALPT feature is enabled. When both of these conditions are met, whenever the fiber link goes down due to the fiber
partner link status or the ALPT forwarded copper link partner status, the converter will detect that the fiber link is
down, disable the POE power for 5 seconds, and then allow the PSE to re-start power negotiation with a PD
(powered device).
After an APR event the converter will lock out the power reset feature for five minutes to allow time for the PD
device to fully boot and re-establish link. When the five minute timeout is complete and the Fiber link has been re-
established, the APR functions will begin monitoring for the next fiber link down event.
Circled in red above is the location of LED 4 that can be seen inside the metal. LED 4 will turn solid green when the
APR function is enabled and is monitoring the fiber link.
Auto-Negotiation
The Auto-Negotiation feature is permanently enabled.
Auto-MDI/MDIX
The Auto-MDI/MDIX feature is permanently enabled.