Technical Requirements
System Synchronisation
The Centuri Processor requires an external Video Reference Signal to derive various system control and digital audio
timing clocks. Both SD (Standard Definition) and HD (High Definition) sync signals are supported provided they comply
with the following requirements:
Suitable SD sync signals are a standard black-and-burst (75Ω 1 volt pk-pk) signal at either PAL (625 line 50Hz) or
NTSC (525 line, 59.94Hz) frame rates.
The following HD Tri Level sync signals can be used as a valid system reference:
1080i
– 60/59.94/50 Hz
1080p
– 30/29.97/25/24/23.98 Hz
1080PsF – 24/23.98 Hz
720p
– 60/59.94/50 Hz
As standard, C300HD supports both the 48kHz Professional sampling frequency (Fs) and a 96kHz (2Fs) sample rate. A
Variable Sample Rate (VSR) option card adds support for 44.1KHz and 88.2kHz sample rates as well as pull-up/pull-down
multipliers to provide the various additional sampling frequencies that may be required when working with Film and TV
post production in NTSC and HD formats.
Power Connections – Mains Input Voltage & Current
Both the console control surface and the Centuri processor rack are fitted with auto-sensing power supplies and will
function at any voltage from 100 to 240 volts without adjustment.
The console is supplied with one or more detachable mains leads.These leads are 2m in length and the cable diameter is
11mm.The free end of these leads is unterminated for connection to a suitable outlet.
The inrush current present when powering the console can be significant – typically ten times the steady current – so the
use of ‘slow’ or ‘motor’ rated fuses/circuit-breakers is recommended.
Both the Centuri processor rack and the console control surface can be fitted with backup power supplies for PSU
redundancy during live transmissions work.The backup supply works independently from the main supply and the console
will be equipped with two mains input leads. For additional security it is recommended that one of the power sources
should be from an un-interruptable source.
NetBridge (which is a separate 2U unit – see page 23) is fitted with a voltage select switch for 230V or 115V operation.
Confirm that the voltage is correctly set before applying power – see page 23.
See Appendix A for equipment specifications.
Grounding
A standard system should not require any additional grounding over and above that supplied by a correctly installed mains
supply. All rack unit chassis are permanently bonded to mains earth. A permanent mains earth connection via the mains
inlet must be provided.
If, due to the quality of the mains wiring within an installation, it is deemed necessary to improve upon the mains earthing,
chassis ground connection points are provided as follows:
Centuri rack chassis ground can be accessed via a stud located on the rear panel.
Console chassis ground can be accessed via a stud located on the mains power connector panel.
All audio connectors, both analogue and digital, have their screen pins connected directly to the chassis at the point of
entry to comply with AES/EBU grounding and EMC standards.
Pre Installation Information
Section 3
Page 11