Re: USB 2.0 Streaming through SMA

On 30 Jan 2007 08:48:30 -0800, "bkamakot@xxxxxxxxx"
<bkamakot@xxxxxxxxx> wrote:

Hi Paul,

Thx for your response.

We are trying to add a USB interface to one of our wireless modules(a
transmitter and a receiver). We would like to demonstrate high speed
(480Mbps) data streaming from a PC using USB through the transmitter;
and have the receiver stream to another PC. The transmitter and the
receiver have a SMA interface,Saying that the wireless interface has SMA/SMB/SMC, BNC/TNC, N etc.
interface does not tell anything usable about the voltage levels or
protocol it expects/generates.

The voltage swing should be about 0.6V. The module does not really
expect a specific protocol, it will just stream any data signals that
are sent through the SMA interface. The module consists of a wireless
transmitter and receiver.

Sounds like a simple FSK link with varactor input and ratio detector
(with perhaps a Schmitt trigger) output. Such systems are usable in
communication systems between ground and space at any data rate and at
very low data rates 1200-9600 bit/s as used in amateur radio packet
networks used for decades.

Any ground based systems using high data rates must somehow deal with
the multipath issue.

Anyhow, USB is the worst system for PC to PC communication, since USB
is simply a master (PC) to slave (any small device) hierarchical
communication system in the old IBM SNA tradition :-). With USB you
can not transfer data between two PCs, unless you have an
"intelligent" cable, which emulates two slaves back to back.

If you want to demonstrate your link, why not connect a signal
generator to the transmitter and observe the eye pattern with an
oscilloscope.

Paul

.

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