This is applicable only for VSP8200 & VSP8400. Each octet string contains the value of a port LED status. One octet is used for each port. Each octet contains two nibbles (two 4 bits). From left to right, the first nibble (higher order 4 bits) of the octet represents the Link/Activity LED (The left one of the two for fiber port. Each copper port has only one LED). The second nibble (lower order 4 bits) of the octet represents the Speed/InUse LED (The right one of the two for fiber port). And use the ifIndex as the position starting from 192th octet. Such 192th octet for 1/1, 193 for 1/2, so on so forth. The following shows the meaning for each nibbles: first 4 bits value meaning for activity 0 : port not valid or not present 1 Light Off : admin enabled & no link & no fault on all channels 2 Slow Blinking Green : admin disable or one or more channelized ports admin disable 3 Blinking Amber : remote fault on 10G/40G fiber port 4 Solid Amber : local fault on one or more channels on 10G/40G/100G fiber port 5 Solid Green : link up & no activity on one or more channels on 10G/40G/100G fiber port : link up with 1G speed on 10G copper port 6 Solid Amber : link up with 100M speed on 10G copper port 7 Solid Blue : link up with 10G speed on 10G copper port 8 Random Blinking Green : link up & activity on one or more channels on 10G/40G/100G fiber port : activity with 1G speed on 10G copper port 9 Random Blinking Amber : activity with 100 speed on 10G copper port 10 Random Blinking Blue : activity with 10G speed on 10G copper port second 4 bits value meaning for Speed. 0 : port not valid or not present 1 Blinking Green : 1G speed on 10G fiber port(SFP+) 2 Solid Green : 10G speed on 10G fiber port : channelized on on 40G fiber port : 1G speed on 1G port 3 Light Off : channelized off on 40G fiber port : 10M speed on 1G port 4 Solid Amber : 100M speed on 1G port