With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
gbicLength62-5um
gbic Length62-5um
1.3.6.1.4.1.3646.1300.2.15.3.1.8
This value specifies the link length that is supported by the GBIC while operating in compliance with the applicable standards using 62.5 micron multi-mode fiber. The value is in units of 10 meters. A value of 255 means that the GBIC supports a link length greater than 2.54 km. A value of zero means that the GBIC does not 62.5 micron multi-mode fiber or that the length information must determined from the transceiver technology. It is common for GBICs to support both 50 micron and 62.5 micron fiber.
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IPHost Network monitor allows you to monitor gbicLength62-5um on D-Link device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring D-Link switches right now.