Mark,
The numbers you quote are from a North American perspective. Here in
Europe Eutelsat sells 72 MHz wide Ku-Band transponders on their
W-series satellites. We've been operational on one of these for
nearly a year, transmitting IP to and from our international hubs
using 8PSK modulation. It works well.
Regards,
Anthony Stone
Satellite Projects
EUnet International (now KPNQwest)
>Cheryl,
>
> I do not believe there is such a device for that high of a
>Bitrate. The most common Maximum Bitrate used over satellite is
>around 40-50 Mb/s. This is due to the satellite is most cases. For
>example a Ku-Band transponder is 54MHz and is typically split into
>two transponders of 27MHz which would limit you to around 26-30
>Mb/s. Now C-Band is around 36MHz which will allow for a higher
>Msymbols/s rate of around 31Ms/s with an FEC of 7/8 you could
>achieve above 40Mb/s. As you can see this is significantly lower
>than an OC-3 Bitrate. I know some manufactures have been playing
>around with using an entire 54MHz Ku-Band Transponder but I have not
>heard of any positive results.
>
> Now that is all for QPSK modulation if you were to use 8PSK
>you could use an entire C-Band Transponder to get up to 70Mb/s, BUT
>you would have to increase the size and power of your antenna's in
>order to maintain the same quality of signal as the QPSK. (Expensive
>undertaking). This is still less than half of an OC-3.
>
> The only solution that I can see is to split up your uplink
>over multiple transponders then re-multiplex it at your downlink. If
>you have any new information about this I would be very interested
>in hearing it.
>
>Mark Senecal
>Scientific Atlanta Canada Inc.
>[email protected]
>tel (416) 321-7794
>fax (416) 299-7145
>
>-----Original Message-----
>From: Cheryl DeMatteis
>[<mailto:[email protected]>mailto:[email protected]]
>Sent: Monday, September 27, 1999 12:56 PM
>To: [email protected]
>Subject: Looking for a Satellite Link Emulator
>
>
>I need to use a Satellite Link Emulator that can sustaine OC3 data
>rates for a development lab. If anyone has any experience with such a
>product could you share your experiences with me.
>
>Thanks,
>Cheryl
>
>--
>Cheryl K. DeMatteis The Aerospace Corporation, M1/102
>[email protected] Computer Science and Technology
>(310)336-1189 2350 E. El Segundo Blvd.
>(310)336-4402 (fax) El Segundo, CA 90245-4691
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