RME HDSP 9632 [52/87] Cabling and termination
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User's Guide HDSP System HDSP 9632 © RME
26.3 Cabling and Termination
Word clock signals are usually distributed in the form of a network, split with BNC T-adapters
and terminated with resistors. We recommend using off-the-shelf BNC cables to connect all
devices, as this type of cable is used for most computer networks. You will find all the neces-
sary components (T-adapters, terminators, cables) in most electronics and/or computer stores.
Ideally, the word clock signal is a 5 Volt square wave with the frequency of the sample rate, of
which the harmonics go up to far above 500 kHz. To avoid voltage loss and reflections, both the
cable itself and the terminating resistor at the end of the chain should have an impedance of 75
Ohm. If the voltage is too low, synchronization will fail. High frequency reflection effects can
cause both jitter and sync failure.
Unfortunately there are still many devices on the market, even newer digital mixing consoles,
which are supplied with a word clock output that can only be called unsatisfactory. If the output
breaks down to 3 Volts when terminating with 75 Ohms, you have to take into account that a
device, of which the input only works from 2.8 Volts and above, does not function correctly al-
ready after 3 meter cable length. So it is not astonishing that because of the higher voltage,
word clock networks are in some cases more stable and reliable if cables are not terminated at
all.
Ideally all outputs of word clock delivering devices are designed with very low impedance, but
all word clock inputs with high impedance, in order to not weaken the signal on the chain. But
there are also negative examples, when the 75 Ohms are built into the device and cannot be
switched off. In this case the network load is often 2 x 75 Ohms, and the user is forced to buy a
special word clock distributor. Note that such a device is generally recommended for bigger
studios.
The HDSP 9632's word clock input can be high-impedance or terminated internally, ensuring
maximum flexibility. If termination is necessary (e.g. because the card is the last device in the
chain), push the switch at the back beside the BNC socket (see chapter 26.1).
In case the HDSP 9632 resides within a chain of devices receiving word clock, plug a T-adapter
into its BNC input jack, and the cable supplying the word clock signal to one end of the adapter.
Connect the free end to the next device in the chain via a further BNC cable. The last device in
the chain should be terminated using another T-adapter and a 75 Ohm resistor (available as
short BNC plug). Of course devices with internal termination do not need T-adaptor and termi-
nator plug.
Due to the outstanding SteadyClock technology of the HDSP 9632, we recommend not to
pass the input signal via T-adapter, but to use the card's word clock output instead. Thanks
to SteadyClock, the input signal will both be freed from jitter and - in case of loss or drop out
– be reset to a valid frequency.
26.4 Operation
The HDSP 9632's word clock input is active when Pref. Sync Ref in the Settings dialog has
been set to Word Clock, the clock mode AutoSync has been activated, and a valid word clock
signal is present. The signal at the BNC input can be Single, Double or Quad Speed, the HDSP
automatically adapts to it. As soon as a valid signal is detected, the green LED at the bracket is
lit, and the Settings dialog shows either Lock or Sync (see chapter 33.1). In the status display
AutoSync Ref the display changes to Word. This message has the same function as the green
Lock LED, but appears on the monitor, i.e. the user can check immediately whether a valid
word clock signal is present and is currently being used.
In the line Freq., the AutoSync Ref shows the frequency of the reference signal, measured by
the hardware. In this case the frequency of the current wordclock signal is measured and dis-
played.
Содержание
- Dsp system hdsp 9632 1
- Hammerfal 1
- User s guide 1
- Driver installation and operation windows 2
- General 2
- Connections and totalmix 3
- Driver installation and operation mac os x 3
- Technical reference 4
- General 5
- Hdsp 9632 5
- User s guide 5
- Brief description and characteristics 6
- Introduction 6
- Package contents 6
- System requirements 6
- External connectors 7
- Hardware connectors 7
- Hardware installation 7
- Internal connectors 8
- Accessories 9
- Warranty 9
- Appendix 10
- Ce fcc compliance 11
- Iso 9001 11
- Note on disposal 11
- Driver installation and operation windows 13
- Hdsp 9632 13
- User s guide 13
- Deinstalling the drivers 14
- Driver and firmware 14
- Driver installation 14
- Driver update 14
- Configuring the hdsp 9632 15
- Firmware update 15
- Settings dialog 15
- Settings dialog dds 18
- Clock modes synchronisation 19
- Operation and usage 21
- Playback 21
- Dvd playback ac 3 dts under mme 22
- Notes on wdm 23
- Multi client operation 24
- Digital recording 25
- Analog recording 26
- General 26
- Known problems 26
- Operation under asio 2 26
- Operation under gsif gigasampler interface 27
- Windows 2000 xp 27
- Digicheck 28
- Using more than one hammerfall dsp 28
- General 29
- Hotline troubleshooting 29
- Installation 30
- Channel routing asio at 96 khz 31
- Diagrams 31
- Channel routing wdm at 96 khz 32
- Driver installation and operation mac os x 33
- Hdsp 9632 33
- User s guide 33
- Driver and flash update 34
- Driver installation 34
- Driver update 34
- Flash update 34
- Configuring the hdsp 9632 35
- Settings dialog 35
- Settings dialog dds 37
- Clock modes synchronisation 38
- Mac os x faq 40
- Midi doesn t work 40
- Round about driver installation 40
- Pci card and pci slot compatibility 41
- Repairing disk permissions 41
- Supported sample rates 41
- Various information 41
- Hotline troubleshooting 42
- Diagram channel routing at 96 khz 43
- Connections and totalmix 45
- Hdsp 9632 45
- User s guide 45
- Analog connections 46
- Line inputs 46
- Headphones 47
- Line outputs 47
- Digital connections 48
- Word clock 50
- Word clock input and output optional word clock module 50
- Technical description and usage 51
- Cabling and termination 52
- Operation 52
- Overview 53
- Totalmix routing and monitoring 53
- The user interface 55
- Elements of a channel 56
- Tour de totalmix 56
- Mute und solo 58
- Submix view 58
- Presets 59
- The quick access panel 59
- Preferences 61
- The monitor panel 61
- Editing the names 62
- Hotkeys 63
- Menu options 64
- Level meter 65
- Elements of the matrix view 66
- Operation 66
- Overview 66
- Totalmix the matrix 66
- Advantages of the matrix 67
- Asio direct monitoring windows only 67
- Totalmix super features 67
- Copy routings to other channels 68
- Delete routings 68
- Selection and group based operation 68
- Recording a subgroup loopback 69
- Using external effects devices 70
- Mapping 71
- Overview 71
- Totalmix midi remote control 71
- Operation 72
- Simple midi control 73
- Loopback detection 74
- Hdsp 9632 75
- Technical reference 75
- User s guide 75
- Tech info 76
- Analog 77
- Technical specifications 77
- Digital inputs 78
- Digital outputs 78
- Digital 79
- Lock and synccheck 80
- Technical background 80
- Latency and monitoring 81
- Ds double speed 82
- Aes ebu spdif 83
- Qs quad speed 83
- Noise level in ds qs mode 84
- Steadyclock 84
- Block diagram hdsp 9632 85
- Diagrams 85
- Connector pinouts 86
- Overview channels expansion boards 87
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