I have a question regarding the link speeds of a laptop.
I recently purchased an SG-200 18 port GB switch. I'm having a problem with a particular laptop's network link speed.
I have a laptop (running Windows 7) with a JMicron PCI Express Gigabit Ethernet Adapter. When this computer is directly plugged into the switch (using a standard Cat-6 cable), all I can get is 100Mbps (FastEthernet - FE) link speeds. This is confirmed by the LEDs on the SG-200 switch and the properties of the network adapter within Windows. I haven't tried any testing to see what kind of speeds I would get with large file transfers or whatnot, but I'm assuming the link light for FE (or lack thereof for the GBE link speed) is correct. Also, it doesn't matter if I plug this laptop into port 1 or port 16, all will link at FE.
Here's where I become confused:
a) If I take the same laptop/cable, just remove the one end from the SG200, and plug that directly into different a HP 1400 Procurve or Linksys EG008W switch, I *do* get GBE link speeds as indicated on those switches and confirmed within the network adapter's properties within Windows.
b) I have another small form HP based laptop, which has a Realtek Gigabet Ethernet network adapter. If I plug this into the Cisco SG200 using the same cable that was used in the laptop mentioned above, I *do* get GBE link speeds. So, I think that rules out the network patch cable as the problem. Note, I get GBE link speeds on all ports (1-16).
I checked the JMicron adapter's properties and tried both Auto-Negotiate as well as Full Duplex 1000MBps without success. Is there anything anyone can suggest to get the SG200 to link to the JMicron network adapter at Gigabit Ethernet speeds?
TIA
-JClausius
