Canon LBP7210Cdn Manual page 537

Press the power switch to turn the printer on.
Make sure that the LNK indicator (B) on the printer's network board is on.
If the printer is connected by 10BASE-T
If the LNK indicator (B) is on, the printer is connected properly.
If the printer is connected by 100BASE-TX
If the LNK indicator (B) and 100 indicator (A) are on, the printer is
connected properly.
NOTE
When all the indicators are off
"All the Indicators on the Network Board Are Off"
When the ERR indicator (C) is on or blinking
"The ERR Indicator on the Network Board Is On"
"The ERR Indicator on the Network Board Blinks at an Interval of Four Times"
"The ERR Indicator on the Network Board Is Constantly Blinking"
Step 2: Setting the IP Address