I friend of mine just obtained the CCU-680 from CAT telecom of Thailand.

CCU-680 delivers rev. A of the CDMA2000 EVDO technology.

After a couple of hours of testing with various equipment we must say that we consider this a considerable improvement compared to previous hardware and technologies available to me, that being the CCU-650 and Sierra Aircard 580.

1. Latency is down, pinging with frames of 1500 bytes only produces a latency of about 100-200 milliseconds to my first point of connection, before this number was around 1000-1500 ms.

2. Upload is considerably better, we are at times almost pusing half a megabit of upload.

3. Download is slightly faster.

4. The entire control of the connection seems to have improved, even when surfing or downloading it does not raise my latency times with any considerable amount when pinging my first point of connection.

This is most likely largely because of the faster upload. Since then TCP control frames have more bandwidth in the upstream connecting, making the connections not having to retransmit alot of data becase control frames getting lost in the stream due to congestion.

The Y-Cable was needed to get this good connection, we only had half the download and upload speeds when the Y-cable were not in use.

Also when using the Y-cable with any kind of laptop is the fact that you might need to connect to two USB ports at opposite side of the board, if the USB ports are too close they might be sharing power from the same hub.