With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
gbicEncoding
gbic Encoding
1.3.6.1.4.1.3646.1300.2.15.3.1.4
The encoding value indicates the serial encoding mechanism that is the nominal design target of the particular GBIC. value 0 - Unspecified 1 - 8B10B 2 - 4B5B 3 - NRZ 4 - Manchester 5 - SONET Scrambled
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IPHost Network monitor allows you to monitor gbicEncoding 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.