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DCS 992 User Manual

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dCS 992
Master Clock
User Manual
Software version 2.0x
January 2001
© 1999, 2000, 2001 dCS Ltd
All rights reserved. Reproduction of this manual in any manner whatsoever,
1
without the written permission of dCS
is strictly forbidden. Additional copies of
this manual may be obtained from dCS.
Information contained in this manual is subject to change without notice, and
whilst it is checked for accuracy, no liabilities can be accepted for errors.
1
dCS Ltd is Data Conversion Systems Ltd. Company registered in England No. 2072115

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Summary of Contents for DCS 992

  • Page 1 Information contained in this manual is subject to change without notice, and whilst it is checked for accuracy, no liabilities can be accepted for errors. dCS Ltd is Data Conversion Systems Ltd. Company registered in England No. 2072115...

  • Page 2: Product Features

    992 User Manual Manual for Software Version 2.0x dCS Ltd January 2001 RODUCT EATURES Formats PCM from 96 kS/s down to 32 kS/s Formats supported are: AES/EBU (XLR and BNC), Dual AES (XLR) and SDIF-2 Word Clock (BNC). Syncing Master mode or can sync to Word Clock or 1MHz, 5MHz or 10MHz GPS source, in Slave mode or Learn mode.
  • Page 3 992 User Manual Manual for Software Version 2.0x dCS Ltd January 2001 Page 3 Manual part no: DOC063992 iss 2A1 file 063992ma2a1.pdf available from website Contact on + 44 1799 531 999 email to: more@dcsltd.co.uk (inside the UK replace + 44 with 0)

  • Page 4: Table Of Contents

    Using a dCS 992 to Sync a dCS 904 Using a dCS 992 to Sync a dCS 972 Upsampling a CD Using a dCS 992 to Sync a dCS 972 Converting PCM to DSD 8 Channel P3D DSD Set Up with Monitoring Operating Several Units on One Remote Chain Multi-channel Sample Rate Conversion –...

  • Page 5: About This Manual

    992 User Manual Manual for Software Version 2.0x dCS Ltd January 2001 Troubleshooting Your System dCS Support.......................68 I wish ..If You Need More Help Other Information Indexes and Software Version Numbers............70 Definitions of Units Abbreviations Used Full Contents...

  • Page 6: Using Your Dcs 992 For The First Time

    Remote software, running on a PC – perhaps at base. These setups may then be stored in the dCS 992, and recalled from its front panel without a PC, perhaps on location. We strongly recommend this mode of operation.

  • Page 7: Installing Unit In A Rack

    2, otherwise set it to 1. Dual AES requires only one Reference connection. Set up like this, the dCS 992 will operate in Master mode, and the system it is connected to will (have to) lock to it. You should have audio.

  • Page 8: The Hardware - Architecture, Controls And Connectors

    – A ARDWARE RCHITECTURE ONTROLS AND ONNECTORS dCS 992 Architecture The dCS 992 is capable of generating some extremely complex clocking arrangements. To help understand some of its features, the architecture is described below. AES generators AES3 outputs AES 1...

  • Page 9: Table 1 - Agens, And What Can Be Programmed

    992 User Manual Manual for Software Version 2.0x dCS Ltd January 2001 TCXOs and AGENs The unit contains several TCXOs, only one of which is active at any time. The active one is temperature compensated and controlled by a DSP. Its output is routed to four independent AGEN AES3 generators (AGEN 1–4).

  • Page 10: Figure 2 - Sgen Generators And Word Clock Outputs

    12.288 MHz (or 11.2896 MHz – the 256 Fs superclock). Sync Link The dCS 992 is capable of Sync Link operation with dCS 972s – see Figure 14 page 41. This operates for all supported sample rates of 44.1kS/s or higher 48kS/s, 88.2kS/s, 96kS/s, 176.4kS/s, 192kS/s are all okay), and needs no...
  • Page 11 992 User Manual Manual for Software Version 2.0x dCS Ltd January 2001 Page 11 Manual part no: DOC063992 iss 2A1 file 063992ma2a1.pdf available from website Contact on + 44 1799 531 999 email to: more@dcsltd.co.uk (inside the UK replace + 44 with 0)

  • Page 12: Rear Panel

    Loop Out may be connected to another suitably equipped dCS unit, allowing several units to controlled by the same PC. The Remote software will allow the unit to be software upgraded without removing the lid by downloading new software via the Remote In connector.
  • Page 13 There will be a label on the underside of the unit that contains a number such as 992-4B1-6B2-2A1-3A2-12345. This is the serial number, but it also contains vital configuration information. We will need this number (all of it) to give you support over the phone, or to ship you software updates.

  • Page 14: Front Panel

    Data Conversion Systems dCS 992 Master Clock Figure 4 – Front Panel The dCS 992 uses a combination of front panel buttons for frequently changed functions and a step through menu for features you might set and forget. Sample Rate Button...

  • Page 15: Slave Mode

    The unit will continue to operate and the drift in sample frequency caused by crystal ageing may not be important in your application. To have your dCS 992 re-calibrated, please contact dCS. You may be able to re-calibrate your unit locally.

  • Page 16: Table 2 - Output Data Format Indication, Higher Sample Rates

    992 User Manual Manual for Software Version 2.0x dCS Ltd January 2001 Single AES is the only option available if the sample rate is set to 32, 44.1 or 48kS/s so the Output Format button has no effect. As the...
  • Page 17 992 User Manual Manual for Software Version 2.0x dCS Ltd January 2001 Page 17 Manual part no: DOC063992 iss 2A1 file 063992ma2a1.pdf available from website Contact on + 44 1799 531 999 email to: more@dcsltd.co.uk (inside the UK replace + 44 with 0)

  • Page 18: The Software - The Menu

    OFTWARE Overview The dCS 992 has many other functions that either need to be accessed only occasionally, or are informative in nature. These functions can be accessed either by the Remote software, running on a PC and connected to the unit by an RS-232 link - or (in most cases) by the Menu.

  • Page 19: The Menu Sequence

    992 User Manual Manual for Software Version 2.0x dCS Ltd January 2001 The Menu Sequence Sample Rate Func Test Generator Parameter Opens the Selects tone Level Adjusts Test Sets the output Function Menu Turns the tone or Frequency for...

  • Page 20: Menu Items

    1-9) and five dCS pre-loaded stores nine user programmable stores (Stores A-E). The dCS pre-loaded stores may not be overwritten – the user (Stores stores may be loaded by the user when setting up the unit with the remote from a PC.

  • Page 21: Table 3 - Store A-E Contents

    Displays the internal temperature of the unit. Press menu to toggle between Fahrenheit and Celsius. Phone – dCS Phone Number dCS telephone number scrolls across the display. Page 21 Manual part no: DOC063992 iss 2A1 file 063992ma2a1.pdf available from website Contact on + 44 1799 531 999 email to: more@dcsltd.co.uk...

  • Page 22: Dcs Fax Number

    – Internal Number The control board part number (version) scrolls along the display. Although this is recorded at dCS with the serial number, it is a good double check to give us both these numbers when calling for help. S-No –...

  • Page 23: Figure 6 - Aes G Menu Command Operation

    992 User Manual Manual for Software Version 2.0x dCS Ltd January 2001 AES G AGEN 1 AGEN 2 88.2 AGEN 3 AGEN 4 44.1 PHASE Chnge +/-128 Figure 6 – AES G Menu Command Operation AES O – AES3 Output Selector...

  • Page 24: Figure 8 - Sdif Menu Command Operation

    992 User Manual Manual for Software Version 2.0x dCS Ltd January 2001 SDIF – SDIF Output Adjuster This menu entry allows the phase and sample rate of each SGEN generator to AES G be set up. As with the command, it is an emergency only control method –...
  • Page 25 992 User Manual Manual for Software Version 2.0x dCS Ltd January 2001 - Menu Exit Exits the menu. Alternatively, the menu may be left to time out. Page 25 Manual part no: DOC063992 iss 2A1 file 063992ma2a1.pdf available from website...

  • Page 26: Remote Software

    January 2001 EMOTE OFTWARE Overview The dCS Windows Remote is the recommended way of setting up unit to make full use of it’s extended features. It consists of 2 main screens, as below: AGEN Generator Control There are four independent AES generators on the 992 (AGEN 1-4), of which AGEN 1 is of special note.
  • Page 27 992 User Manual Manual for Software Version 2.0x dCS Ltd January 2001 To change the sample rate, click on the Sample Rate drop down list, which will show the available frequencies for this output: Pressing the Edit button allows you to modify the messaging on this generator,...
  • Page 28 992 User Manual Manual for Software Version 2.0x dCS Ltd January 2001 If this is the AGEN 1 generator, a Tone Generator section is displayed. Pressing the Setup button allows you to configure the signal generator, by displaying the...
  • Page 29 992 User Manual Manual for Software Version 2.0x dCS Ltd January 2001 In this case, this output has “Link to AGEN 1” selected, which means that this SGEN generator will track the frequency output by the AGEN 1 generator (which...
  • Page 30 992 User Manual Manual for Software Version 2.0x dCS Ltd January 2001 Assigning Generators to Outputs Each AGEN generator can be routed to between 0 and 4 AES outputs simultaneously. The mechanism for this is as follows. In each AGEN generator box is the Setup button, and below it is a box showing the frequency of that generator.
  • Page 31 The dCS 992 has the capability of remembering up to 9 user-definable stores, and also has an additional 5 stores which are pre-loaded by dCS and cannot be changed by the user. The user stores are Store 1-9, and the fixed stores (dCS Stores) are Store A-E.
  • Page 32 992 User Manual Manual for Software Version 2.0x dCS Ltd January 2001 The “Info” section shows the contents of the store. To see more detail on a particular output in a store, click on it’s associated button, e.g. AES 2:...
  • Page 33 January 2001 Offset The dCS 992 offers the facility to offset it’s absolute frequency by ±5ppm. It can only do this when in “Master Mode”, i.e. not Slave or Learned modes. To access this, press the Offset button, which will display the following dialog: In this case, the unit has a +1ppm offset –...
  • Page 34 This gives two pages of settings – the first page covers behaviour when sync is lost: “Revert to Master Mode” – when the input goes away, the unit reverts to the 992 native master frequency. “Revert to Learned Mode” – when the input goes away, the unit reverts to its stored learned frequency.
  • Page 35 992 User Manual Manual for Software Version 2.0x dCS Ltd January 2001 The setting tells the unit the bandwidth to use whilst in “Fine Lock”. Note that these bandwidths are very low – you may wish to look at section...

  • Page 36: Using A Dcs 992 To Sync A Dcs 904

    The “base” sample rate (44.1, 48, 88.2 or 96kS/s) generated by the dCS 992 may be multiplied internally by a dCS 904, allowing it to lock at sample rates up to 192kS/s. Another output from the dCS 992 may be used to synchronise a recorder.

  • Page 37: Using A Dcs 992 To Sync A Dcs 972 Upsampling A Cd

    To pre or power amplifier Figure 10 - Using a dCS 992 to Sync a dCS 972 Upsampling a CD The dCS 992 synchronises the CD player and the dCS 972 to its 44.1kS/s outputs. The dCS 972 upsamples the CD player’s digital output to 88.2, 96, 176.4 or 192kS/s in Dual AES format.

  • Page 38: Using A Dcs 992 To Sync A Dcs 972 Converting Pcm To Dsd

    To pre or power amplifier Figure 11 - Using a dCS 992 to Sync a dCS 972 converting 16 bit / 44.1kS/s data from a CD to DSD The dCS 992 synchronises the CD player, the dCS 972 and the dCS 954 to its 44.1kS/s Word Clock outputs.

  • Page 39: Channel P3D Dsd Set Up With Monitoring

    PCM Meter feed for Ch 7 & 8 Figure 12 – 8 Channel P3D DSD Set Up A dCS 992 with four P3D capable dCS 904 units can be used as above to give 8 channel DSD with additional simultaneous AES3 PCM outputs to give level monitoring on PCM equipment.

  • Page 40: Operating Several Units On One Remote Chain

    Digital I/O Figure 13 – Multi-unit Remote Daisy Chain The PC can control several dCS units (up to about 5) on each daisy chain. To make them individually addressable, each unit needs its RS232 address to be different. They can then be identified, and grouped, in the Remote window. The units may be of different types.

  • Page 41: Multi-Channel Sample Rate Conversion - With Multiple Sample Rates Out

    992 User Manual Manual for Software Version 2.0x dCS Ltd January 2001 Multi-channel Sample Rate Conversion – with multiple sample rates out AES1 AES2 AES CLK AES2 PU SH PU SH PU SH MAINS F USE 2A(T) ON SPDIF 1...

  • Page 42: Synchronising The Dcs 992 To A Gps Clock

    Sync Figure 15 – Synchronising dCS 992 to a GPS clock. The dCS 992 may be slaved to the very accurate 10MHz signal generated by a Clock. The microwave carrier from the satellite is derived from an atomic frequency standard, giving a long-term accuracy of the order of 0.1ppt (parts per trillion).
  • Page 43 992 User Manual Manual for Software Version 2.0x dCS Ltd January 2001 Page 43 Manual part no: DOC063992 iss 2A1 file 063992ma2a1.pdf available from website Contact on + 44 1799 531 999 email to: more@dcsltd.co.uk (inside the UK replace + 44 with 0)

  • Page 44: Dcs 992 Technical Information

    PLL provides a high degree of "clock cleaning". Even a poor quality source may be cleaned up and used by a dCS 992 to re-generate an excellent one, if necessary. A consequence of the narrow (possibly very narrow) bandwidth is that it takes quite a long time for the PLL to lock to a new clock frequency.

  • Page 45: Figure 16 - Learn Mode Performance

    The scope has been left recording the reference and the dCS 992 output, over a period of half an hour. The dCS 992 has changed in phase relative to the reference less than 3 usecs – so the learning and subsequent temperature compensation was accurate to about 0.002 ppm.

  • Page 46: Calibration Data From A Typical Unit

    992 User Manual Manual for Software Version 2.0x dCS Ltd January 2001 Calibration data from a typical unit Master Clock turn on transient -1.0 -2.0 Time (Hours) Figure 17 – Turn On Transient Master Clock accuracy at room temperature - started 17-8-2000 -1.0...

  • Page 47: Figure 19 - Typical Frequency Accuracy Over Temperature

    992 User Manual Manual for Software Version 2.0x dCS Ltd January 2001 dCS 992 Typical Frequency Accuracy vs. Temperature 44.1 kS/s 48 kS/s Ambient Temperature (Celsius) Figure 19 – Typical frequency accuracy over temperature Page 47 Manual part no: DOC063992 iss 2A1 file 063992ma2a1.pdf available from website...

  • Page 48: Digital Interface Specifications

    992 User Manual Manual for Software Version 2.0x dCS Ltd January 2001 Digital Interface Specifications Outputs AES/EBU (AES3) Type Balanced, differential Impedance Ω Output level (unloaded) V pk-pk Connector XLR3 male Connections Pin 1 Ground or shield Pin 2...

  • Page 49: Aes3 (Aes/Ebu) Format

    Destination: null For more information on the way dCS implement the AES3 system message to handle higher sample rates, see the Appendix to this manual. For the formal definition of the AES3 interface, see footnote , from the AES.

  • Page 50: Figure 20 - Aes3 Format At 48 Ks/S Over 16 Metres

    992 User Manual Manual for Software Version 2.0x dCS Ltd January 2001 Figure 20 - AES3 format at 48 kS/s over 16 metres Figure 21 – AES3 format at 48 kS/s over 94 metres Page 50 Manual part no: DOC063992 iss 2A1 file 063992ma2a1.pdf available from website...

  • Page 51: Figure 22 - Aes3 Format At 96 Ks/S Over 16 Metres

    992 User Manual Manual for Software Version 2.0x dCS Ltd January 2001 Figure 22 – AES3 format at 96 kS/s over 16 metres Figure 23 – AES3 format at 96 kS/s over 94 metres Page 51 Manual part no: DOC063992 iss 2A1 file 063992ma2a1.pdf available from website...

  • Page 52: Power Consumption

    January 2001 Power Consumption The dCS 992 has a linear power supply, and so power consumption changes as the mains voltage changes. The internal regulation is comparatively efficient for a linear supply, so these changes are kept to a minimum.

  • Page 53: Size, Weight And Operating Conditions

    Operating Conditions The case of the dCS 992 has no ventilation slots or fan cooling, to give: • quiet operation (does not need to be installed in a machine room) •...

  • Page 54: General Technical Information

    Figure 26 below. 250 mHz is the default PLL bandwidth for a dCS 992. It should be remembered that this jitter is very low frequency, and corresponds to very slow and gradual timing changes. It is very substantially below the audio band.

  • Page 55: Figure 24 - Low Frequency Timing Jitter, 1 Hz Pll Bandwidth

    992 User Manual Manual for Software Version 2.0x dCS Ltd January 2001 Figure 24 – Low Frequency Timing Jitter, 1 Hz PLL bandwidth Figure 25 – Low Frequency Timing Jitter, 250 mHz PLL bandwidth Page 55 Manual part no: DOC063992 iss 2A1 file 063992ma2a1.pdf available from website...

  • Page 56: Figure 26 - Low Frequency Timing Jitter, 62.5 Mhz Pll Bandwidth

    992 User Manual Manual for Software Version 2.0x dCS Ltd January 2001 Figure 26 – Low Frequency Timing Jitter, 62.5 mHz PLL bandwidth Page 56 Manual part no: DOC063992 iss 2A1 file 063992ma2a1.pdf available from website Contact on + 44 1799 531 999 email to: more@dcsltd.co.uk...
  • Page 57 992 User Manual Manual for Software Version 2.0x dCS Ltd January 2001 Page 57 Manual part no: DOC063992 iss 2A1 file 063992ma2a1.pdf available from website Contact on + 44 1799 531 999 email to: more@dcsltd.co.uk (inside the UK replace + 44 with 0)

  • Page 58: Options

    Having Your Options Changed dCS support modifications, updates and option changes to supplied units. Major changes are normally carried out at dCS as we have extensive test facilities and can verify the changes. Please contact your Distributor or dCS for details.
  • Page 59 992 User Manual Manual for Software Version 2.0x dCS Ltd January 2001 Page 59 Manual part no: DOC063992 iss 2A1 file 063992ma2a1.pdf available from website Contact on + 44 1799 531 999 email to: more@dcsltd.co.uk (inside the UK replace + 44 with 0)

  • Page 60: Maintenance And Support

    • no dust deposits build up to degrade performance. All parts are replaceable or upgradeable by dCS, for a period of at least five years from the date you purchased your unit. If your unit is damaged in some way, please contact your Distributor or dCS.

  • Page 61: Software

    (www.dcsltd.co.uk). In general, software updates are free. Manuals for updated software can be downloaded from our web site, or just call us. During An Update … As soon as the download starts, the 992 will display Prog. The Windows programme will say Erasing Flash...

  • Page 62: Warranty

    Owner Registration form at the time of sale and returning it to dCS. If you do not receive an Extended Warranty Certificate for this unit within 30 days of purchase, please note the serial number on the underside of the unit and contact dCS.

  • Page 63: Hardware Update Or Calibration

    In order to ensure speedy turn around please contact us prior to returning the unit. Safety and Electrical Safety There are no user serviceable parts inside the dCS 992 and so there is no need to remove the covers. If for some reason you do: IMPORTANT! Disconnect from the mains before removing any covers or changing the fuse.

  • Page 64: Troubleshooting

    ROUBLESHOOTING Error Codes and Messages The error codes reported by dCS 992 provide an effective means to diagnose the majority of problems that may be encountered in use - including problems with the overall system the unit operates in, internal device warnings and internal device failures.

  • Page 65: System Messages And Error Codes

    992 User Manual Manual for Software Version 2.0x dCS Ltd January 2001 System Messages and Error Codes Some other messages may be displayed that give indications of errors from other sources (outside the unit): Display Description The unit is overheating, and performance may suffer. See page 53.

  • Page 66: Troubleshooting Your System

    The synchronised equipment reports the wrong sample rate • If the dCS 992 is set to 88.2 or 96kS/s but the synchronised equipment reports 44.1 or 48kS/s, the Output Format may be set to Dual AES (2 on the Format display) while the synchronised equipment is set to Single AES.
  • Page 67 There is no real-time clock inside the dCS 992, so it can log how long it has been powered for but does not know how old it is. Crystals age slowly with time, as well as use.

  • Page 68: Dcs Support

    We value our customers, and we want to make products that do what you want. If You Need More Help Contact dCS. Our office hours are 8:00 am to about 7:00 pm, Monday to Friday, UK time (UTC in summer, or UTC + 1hr in winter). Contact us by phone or fax...
  • Page 69 992 User Manual Manual for Software Version 2.0x dCS Ltd January 2001 Page 69 Manual part no: DOC063992 iss 2A1 file 063992ma2a1.pdf available from website Contact on + 44 1799 531 999 email to: more@dcsltd.co.uk (inside the UK replace + 44 with 0)

  • Page 70: Indexes And Software Version Numbers

    992 User Manual Manual for Software Version 2.0x dCS Ltd January 2001 NDEXES AND OFTWARE ERSION UMBERS This manual is for software version 2.0x. V2.0x versions differ from version 1.0x in having: • multiple clock generators, for multiple sample rate operations, •...

  • Page 71: Full Contents

    Syncing Functions Test Generator Ease of Use Contents ......................4 About this Manual Using Your dCS 992 For The First Time ............6 Product Overview What’s in the Box? Mains Voltages Installing Unit in a Rack Getting Started The Hardware – Architecture, Controls and Connectors .......8...

  • Page 72: Error Code

    Using a dCS 992 to Sync a dCS 904 Using a dCS 992 to Sync a dCS 972 Upsampling a CD Using a dCS 992 to Sync a dCS 972 Converting PCM to DSD 8 Channel P3D DSD Set Up with Monitoring Operating Several Units on One Remote Chain Multi-channel Sample Rate Conversion –...

  • Page 73: Keywords And Phrases

    January 2001 The unit fails to slave to an external reference Equipment does not lock reliably to the dCS 992 The synchronised equipment reports the wrong sample rate The main display blanks out a few seconds after pressing a button...

  • Page 74: Tables

    Figure 9 – Syncing a dCS 904 to a dCS 992............36 Figure 10 - Using a dCS 992 to Sync a dCS 972 Upsampling a CD.....37 Figure 11 - Using a dCS 992 to Sync a dCS 972 converting 16 bit / 44.1kS/s data from a CD to DSD ..............38 Figure 12 –...

  • Page 75: Keywords And Phrases

    992 User Manual Manual for Software Version 2.0x dCS Ltd January 2001 Keywords and Phrases Fuse, replacement .......60, 66 Fuse, type ..........60 Accuracy, sample rate ....42, 44, 45 Address, RS-232 ........22 AES G............22 Getting started ..........7 AES O............
  • Page 76 992 User Manual Manual for Software Version 2.0x dCS Ltd January 2001 Part number ..........22 Software version ........49, 70 Parts, user serviceable ......60, 63 Software, updating ........61 PC.............. 40 Standard speed........15, 16 Phone, dCS ..........68 Store, recalling ...........20 PLL Pull in range ........

  • Page 77: Owner Registration Transfer

    To transfer the balance of the Extended Warranty to a new owner, please complete the form below in block capitals and forward it, with the Extended Warranty Certificate, to dCS at the address below within 30 days of the sale. dCS Ltd...

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