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nanoFlash FAQs
10-Apr-10 ©Convergent Design, Inc. Page 39 of 42
169. How do I get it on my Flash XDR/nanoFlash?
The ASI feature is a $995 option added to your Flash XDR/nanoFlash either at the time
of purchase or easily enabled via a firmware update in the field using a compact flash
card. The option is activated via a file loaded into the Flash XDR/nanoFlash tied to the
serial number of your unit.
170. Why use ASI over coax cable when coax can carry uncompressed HD-SDI?
At 270 Mbps, quality coax cable can be run >400 meters with modern, quality SDI/ASI
transmitters/receivers, while at 1485 Mbps (HD-SDI), coax can only be run ~200 meters.
Also, a single coax running ASI can carry eleven, 19 Mbps video streams. ASI
maximum data rate is an aggregate ~214 Mbps over one cable.
171. How do you do wireless HD?
MPEG-2 long-GOP is a very efficient CODEC due to the time based compression
algorithms used. This means that the CODEC only saves the video data that has
changed over time. I-Frame based CODECs such as JPEG, DV, etc. compress each
frame individually, storing extra data that is not necessarily needed. MPEG-2 long-GOP
is about 2-3 time more efficient than I-frame based CODECs. This means low bit-rate
high definition MPEG-2 long-GOP still looks very good. To do wireless over a
reasonable distance, low bit-rate is the key. Wireless modulators/demodulators from
companies like Broadcast Microwave Services (BMS) have been tested and verified to
work with the Flash XDR/nanoFlash.
172. What about decoding the ASI stream?
The Flash XDR/nanoFlash works as both an ASI encoder and decoder. The ASI
decoder is only designed to work with a Flash XDR/nanoFlash encoder.
173. Why not make a universal ASI decoder?
Affordable universal ASI decoders currently exist.
174. Does the Flash XDR/nanoFlash operate in byte or burst mode?
The Flash XDR/nanoFlash currently operates in burst mode.
175. Does the Flash XDR/nanoFlash operate in 188 or 204 byte packets?
188 byte packets are ASI packets without any error correction, while the 204 byte
packets incorporate error correction and are used mainly in wireless application. The
Flash XDR/nanoFlash encodes with 188 byte packets. The ASI decode function
supports both as wireless modulators/demodulators output a 204 byte packet.
176. How do I get the video/audio into the Flash XDR/nanoFlash?