RE: Looking for a Satellite Link Emulator
Folks:
These devices do exist.
Check out www.adtech-inc.com
Adtech is based in Honolulu, Hawaii. They manufacture broadband test and
simulation equipment, including satellite link emulators operating up to
OC-3c rates. The high-end emulator is called the SX/14. Its little brother,
the SX/13, supports rates up to 51 Mbps. These units do channel impairment,
as well as delay simulation well beyond GEO.
We have used the SX/14 extensively to model tests that were performed on
NASA's Advanced Communications Technology Satellite at 155 Mbps and 622
Mbps. Hope this helps.
Regards,
Dave Beering
Infinite Global Infratructures, LLC
[email protected]
630-665-1396 (Office)
630-235-7965 (PCS)
-----Original Message-----
From: [email protected] [mailto:[email protected]]On
Behalf Of Senecal, Mark
Sent: Tuesday, September 28, 1999 9:19 AM
To: [email protected]
Subject: RE: Looking for a Satellite Link Emulator
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]]
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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