HOT-303
FIBRE-OPTICAL AUDIO/VIDEO TRANSMISSION
The HOT-303 series of fiber-optical transmission units include the HOT-303/RTX Transceiver, the HOT-303/TX Transmitter and the HOT-303/RX Receiver. All units are available in versions for either single mode or multi mode optical fiber.
HOT-303 handles transmission of one video signal,
a stereo audio signal and a RS-232 data
signal. All signals are transferred in the digital
domain, though inputs and outputs are analog
for video and audio. There is no signal degradation
of any kind as a function of fiber distance.
Transmission distance is up to 2 km for multi
mode fiber and up to 50 km for single mode fiber
(depending on the fiber quality).
There are also an optional choise of front plate
for mounting into a 19”/3 HE card frame. Up to 8
units go into a single card frame.
The Transmitter section has inputs for CVBS
composite video (either PAL, NTSC or SECAM),
two line level audio signals and a RS-232 data
signal up to 115 Kbaud.
The Receiver has corresponding outputs, hence
making the system transparent for both video,
audio and data signals.
In the Transmitter section the video signal is digitized
through a high-speed A/D converter running
at 20 MSa @ 8 bits. There is no compression
of any kind. The balanced audio channels
are digitized through an industry standard A/D
converter running at 40 kHz @ 18 bits. The RS-
232 channel has a single line for transmission
of the TX signal up to 115 Kbaud.
In the Receiver section there is a corresponding
D/A conversion for both video and audio signals.
All input levels are restored on the outputs.
Power supply is from a separate mains adapter,
2 x 9 V AC @ 10 VA. It is available in both
european (230 V) and US (115 V) versions.
The fiber-optical connections are through a pair
of standard SC type connectors. The transmission
wavelength is 1300 nm and allowable attenuation
(power budget) from Transmitter to
Receiver is 16 dB (singlemode version) or 10
dB (multimode version).
The transceiver version uses two parallel optical
fibers for duplex transmission.
| Video bandwidth | 6 MHz (-3 dB) |
| Video input impedance | 75 Ω |
| Video input level | 1 V p-p |
| Video output impedance | 75 Ω |
| Video output level | 1 V p-p into 75 Ω |
| Video resolution | 8 bits |
| Video sample rate | 20 MSa |
| Audio frequency range | 20 Hz -18 KHz (+/-1 dB) |
| Audio dynamic range | 90 dB |
| Audio input impedance | 10 KΩ balanced |
| Audio input level | max. +18 dBu |
| Audio output impedance | 2 x 100 Ω balanced, 1 K ohm unbal. |
| Audio output level | max. +18 dBu |
| Audio resolution | 18 bits |
| Audio sample rate | 40 KSa |
| Data signal format | RS-232 (+/-10 V in) |
| Max. baud rate | 115 Kbaud |
| Fibre optical wave length | 1300 nm |
| Connector | SC type |
| Transmission speed | 200 Mbit |
| Optical mode | multimode/singlemode |
| Power supply | 2x9 V AC @ 10 VA through external PSU |
| Size W x H x D | approx. 112 x 44 x 164 mm excl. Sockets |
| Weight approx. | 500 grams |
 |
HOT-303 datasheet + Manual |
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MARENIUS
ELEKTRONIKUTVECKLING AB
P.O. BOX 5086
SE-42605 V FROLUNDA
SWEDEN
Phone +46 31 691610
Fax +46 31 693188
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