User's Manual

SK202 User manual 2 of 7
Figure 2. Physical picture of SK202 non-contact connector
3. Controlled Auto-negotiation
The Network PHY chip embedded in the SK202 is set in Auto-negotiation mode and
is able to support 10/100/1000Mbps. In order for the SK202A and SK202B to
communicate they must operate at the same speed. The Green LED on the RJ45
connector of blinks when a 1Gbps communication is established between the local
and the distant PHY. The Orange LEDs blinks when the communication is at 10Mbps
The PHYs on the SK202 work independently and each one negotiates automatically
with the device it is connected to. So two independent negotiations take place in parallel.
As a consequence, if the two devices, such as a laptop and a camera, advertise
different maximum speeds, the two auto-negotiation results will differ.
Figure 3. Non controlled auto-negotiation may fail
For the SK202 communication to establish correctly between devices
advertising different maximum speed capabilities, the auto-negotiation of the
fastest device has to be controlled.
Thanks to the controlled auto-negotiation on the laptop, one can ensure the link with