Sony HDC-25 Series Technical Information page 11

Technical Information: Sony HD System Cameras
1080i (50Hz or 59.94Hz/ 2:1-interlaced), 1080PsF (23.98; 24; 25; 29.97 PsF) and
720P (50P and 59.94P) HDTV signals occupy a data rate of about 1 Gbps. These
signals can easily be transmitted within an HD-SDI data stream and can be handled
by a standard HD-SDI interface.
The new HDTV formats marked with yellow color in Picture 4 cannot be handled by a
conventional HD-SDI infrastructure. Here, either a dual-link HD-SDI or a 3G HD-SDI
interface is requested. The fibre transmission system of the HDC-series supports 3G
data rates as a standard, so all future HDTV formats can be transmitted in their
native form, without using compression or data reduction.
However, in many locations, triax cables are pre-installed and there is no other
choice for a broadcaster than using these cables for his production. To satisfy these
specific production requirements, Sony has developed special converters to adapt the
triax cables in the field (HDTX-200 on the camera side and HDFX-200 on the CCU-
side).
All HDCU-models feature fibre transmission technology so that in case a triax
infrastructure is used, the HDFX-200 converts the signal back into the digital fibre
domain to be accepted by the HDCU.
Picture 5 illustrates the compatible use of fibre and triax cables (HDC-range)
By using the digital triax technology, some limitations occur compared to the fibre
transmission system. The following charts explains the major differences of both
transmission technologies:
Camera Head
Transmission Technology
HD Prompter Channel
HD-Trunk Channel
Ethernet Trunk Channel
RS-422/RS-232 Trunk
VBS Prompter Channels
Utility Power Output
V6.0 / 03-2014
HDC-2500 HDC-1700
HDC-2400
3G Fibre
Yes
Yes
Yes
1-CH: 150 kbps 1-CH: 150 kbps
2-CH: 75 kbps 2-CH: 75 kbps
2
12V / 2.5A
HDC-2570
HDTX-200/HDFX200
3G Fibre Digital Triax (3G)
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1-CH: 38.4 kbps
2-CH: 19.2 kbps
1
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1
12V / 2.5A
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