AES/EBU and ADAT at 96kHz

Welcome to the Pyramix MassCore discussion forum.
Forum rules
The Merging Technologies team cannot be held responsible for support queries logged on the public forums. If a support query is logged here and only here, it may not be found and dealt with by the appropriate team.
To ensure that your support issue or bug report is dealt with properly and in good time, please use the link to the tech support request form page on the Merging website.
Make sure to let us know what version you are using when you send your mail. THANKS!
RKoschnicke
Posts: 48
Joined: Wed Jul 12, 2006 17:29
Location: Woellstein / GERMANY
Contact:

AES/EBU and ADAT at 96kHz

Postby RKoschnicke » Thu Jul 13, 2006 17:13

Hello, perhaps someone here is able to answer me this two questions:

1. Is it possible to use one Mykerinos with 24 channels AES/EBU-I/O at 96kHz and a second
Mykerinos with 8 channels ADAT-I/O at 96kHz in one system and with HDTDM-Bus?

2. If the AES/EBU card only gives 12 channels at 96kHz with HDTDM, is this still possible with single wire 96kHz or must it have a dual wire 96kHz input?

Tank you very much!

Many greetings - Ralf Koschnicke

Gerhard
Posts: 76
Joined: Wed Nov 19, 2003 15:12
Location: Landau/Pfalz, Germany

Postby Gerhard » Thu Jul 13, 2006 19:33

Guten Tag Ralf,

it's one of advantages of Pyxramix that you can freely combine different I/O formats (including format conversion), so:
1. yes

2. "If the AES/EBU card only gives 12 channels at 96kHz"...

12 channels at 96 kHz was the limitation of PMX up to Ver. 4.3
Ver. 5 finally allows 24 inputs at 96 kHz.
24 inputs are (physically) possible with single wire only, since there are 3 D-Sub connectors à 8 I/O. In any other respect you can freely select single or dual wire.

Welcome in the world of Pyramix!

Regards,
Gerhar

RKoschnicke
Posts: 48
Joined: Wed Jul 12, 2006 17:29
Location: Woellstein / GERMANY
Contact:

Postby RKoschnicke » Thu Jul 13, 2006 19:57

Danke Gerhard!

basically I see the advantages of freely combining I/O formats. But did you have checked this configuration? At the manual I have found a chart and there it seems so that 24 channel 96kHz needs the new XDTDM Bus and ADAT I/0 has with XDTDM only 4 channels output at 96kHz. But this information is not very clear. The conjunction of 24 channels 96KHz and XDTDM is described nowhere a second time.

But the information that I can definitvely use 12 channels "single-wire" is great, thank you!

Best regards - Ralf

Gerhard
Posts: 76
Joined: Wed Nov 19, 2003 15:12
Location: Landau/Pfalz, Germany

Postby Gerhard » Thu Jul 13, 2006 22:34

Hi Ralf,

I admit I am working with AES only and didn't check für ADAT.
The following information is copied from this website (goto >Mykerinos > I/O Availability > ADAT). I don't know if it's still valuable for Ver. 5:
ADAT I/O Option
This I/O daughter card features two sets of Toslink Optical connectors each carrying up to eight channels of 24-bit Audio in the ADAT compatible format.
This provides 16 channels of input and 16 channels of output up to 48kHz and 8 channels up to 96kHz in S/MUX compatible format.
One of the sets can be programmed in software to carry SPDIF (or AES-EBU) formatted signals instead of ADAT. In this mode, total I/O is limited to 2 + 8 = 10 Digital Audio channels.

Regards,
Gerhard

P.S. Private mail!

Pascal
Posts: 43
Joined: Thu Jun 03, 2004 20:56
Location: Montreal, Qc, Canada
Contact:

Postby Pascal » Fri Jul 14, 2006 15:08

Hi there,

in multi-board configuration (XDTDM), the ADAT daughter card cannot be used for input and is then only capable of 8 ADAT outputs via Optical
Output A with the same 8 duplicated on Optical Output B. (as of version 5.0.17 SP2 RC1 )

Also, please take note that the ADAT daughterboard requires modification before use with XDTDM mode. Failure to do this may result in data loss.


Pascal
*****************************
Sound Engineer/Product Specialist
Sonotechnique PJL Inc
Montreal, Canada

Gerhard
Posts: 76
Joined: Wed Nov 19, 2003 15:12
Location: Landau/Pfalz, Germany

Postby Gerhard » Fri Jul 14, 2006 16:18

Hallo,

I apologise for my bad informations. I never worked with ADAT, just relied on what I thought to be common sense.
Merging's hardware information about ADAT continues as follows:
SPECIFICATIONS
Optical I/O configuration
INPUT Modes
* ADAT Channel 1–8 (Optical A) - ADAT Channel 9–16 (Optical B)
* SPDIF Channel 1–2 (Optical A) - ADAT Channel 9–16 (Optical B)
[...]
Compatibility with the HDTDM Bus in order to connect it to other Mykerinos boards.
(ADAT daughtercards with serial number < 20300 are not compatible with the HDTDM bus and therefore are not multiboard capable.)


If I understand Pascal's comment right, the above mentioned specs are valuable for Version 4.x only?
And, back to Ralf's original question, what happens in 96 kHz (multiboard) mode? Still 8 inputs available, if working with Version 4?

Regards,
Gerhard

Pascal
Posts: 43
Joined: Thu Jun 03, 2004 20:56
Location: Montreal, Qc, Canada
Contact:

Postby Pascal » Fri Jul 14, 2006 17:12

Hi Gerhard,

the available IOs aren't dependent on the version but on the bus type chosen. In other words, the ADAT daughter card will work fine in version 5 when used in HDTDM mode.

In version 4, only HDTDM mode is available. The ADAT daughter card has up to 8 channels at 96kHz-24bit in S/MUX compatible format.

To clear up things:

Version 4:


- HDTDM mode only
- 16 ADAT IOs at 48kHz-24bit OR 8 ADAT IOs at 48kHz-24bit + 2 SPDIF IOs for a total of 10 channels

Version 5

HDTDM OR XDTDM mode available

In HDTDM mode:
Fully supported as in version 4 (Same choices of IOs)

In XDTDM mode:
Supports the XDTDM mode with a hardware rework ONLY. In this mode,
the ADAT daughter card offers 8 output channels through optical output A (replicated on the optical output B) and NO INPUTS.
This hardware rework consists to add a shield to the ADAT like for the DUAL daughter card.

Finally:
When running in a HDTDM multi-board system, the ADAT I/O daughter card offers audio in ADAT format ONLY. The SPDIF format is only available
in STANDALONE (mono-board) mode.

All the best,

Pascal
*****************************
Sound Engineer/Product Specialist
Sonotechnique PJL Inc
Montreal, Canada

Gerhard
Posts: 76
Joined: Wed Nov 19, 2003 15:12
Location: Landau/Pfalz, Germany

Postby Gerhard » Fri Jul 14, 2006 18:31

Thanks Pascal,

that's quite clear now :wink:

I wish Merging would have expressed it as well. From Ver 5.0 user manual: "The inter-board bus has been enhanced in terms of bandwidth and is now called XDTDM" - I suspected XDTDM was essential for full functionality (multiboard or whatsoever).

After all, given a combination of AES and ADAT cards, at 2fs it's getting a hard decision:

HDTDM AES: 12 inputs
HDTDM ADAT: 8 inputs

XDTDM AES: 24 inputs
XDTDM ADAT: 0 inputs

Regards,
Gerhard

RKoschnicke
Posts: 48
Joined: Wed Jul 12, 2006 17:29
Location: Woellstein / GERMANY
Contact:

Postby RKoschnicke » Fri Jul 14, 2006 23:36

Thank you Pascal, thank you Gerhard,

I think it is clear now. But Gerhard you are right, it is not very satisfying.

At the moment i want to use three boards, one with AES/EBU and two with ADAT. So i will get 12 channels AES/EBU I/O at 2fs and 16 channels ADAT at 2fs with HDTDM. But later i want to use more AES/EBU. And then the only possibility to do so in combination with ADAT inputs is an upgrade of one of the ADATs to AES/EBU.
Now you could think that this is O.K. But i need four brackets with Sub-Ds and two of them are only used with 4 channels I/O!!! (12ch/"Single wire"/2fs). This requires very special cable configurations and extra space for brackets.
I think all in all it is not a very good solution.
Perhaps MERGING could at least offer a special Sub-D-bracket with a cable set which connects one Sub-D with two AES/EBU cards.

regards - Ralf

Olivier Auberson
Site Admin
Posts: 12
Joined: Tue Apr 30, 2002 08:10
Location: Puidoux, CH
Contact:

Postby Olivier Auberson » Tue Jul 18, 2006 17:34

Dear Ralf,

It is not Merging’s policy to announce new products before they are market-ready. However, in consideration of your forward-looking future upgradeability concerns, it may be useful for you to know that Merging is actively working on a new design of the ADAT daughter card fully XDTDM compatible and which should be available within the next 6 months. This new ADAT will offer more than 16 I/O channels, but the definitive amount of channels is still in discussion.

Now, I totally agreed with your post above; but, to be sure I understand well your way to count the Sub-D brackets, let me clarify how the repartition of the channels is made through the Front and Rear0 connectors:

- CH 1/2 – 3/4 – 5/6 and 7/8 are located on the on-board Front connector, and
- CH 9/10 and 11/12 are located on the Rear0 connector (= 1 extension Sub-D bracket)

So, the number of Sub-D brackets (including the on-board “Front” connector) needed to have 24 I/O in HDTDM mode with 2 AES/EBU daughter cards running at 2fs in single wire is 2 per board, which made effectively a total of 4 (the 2 on-board front connectors and 2 more extension Sub-D brackets connected to the Rear0 connectors). The Rear 1 connectors are not used.

Regarding your request to have a special cable using half of the channels of each Rear 0 connector of both AES/EBU daughter cards, Merging does not recommend doing it, because this kind of cable will be fully useable in 2fs - single wire mode only ! This is why we have not planned to manufacture such a cable.

I hope to have answered and clarified most of your questions and remarks above. Please, also, have a look on pages 438-439 of the Pyramix User Manual for the internal bussing & I/O capabilities in HDTDM and XDTDM modes.

Best Regards.
Olivier Auberson
Hardware Engineer
Merging Technologies
CH-1070 Puidoux

RKoschnicke
Posts: 48
Joined: Wed Jul 12, 2006 17:29
Location: Woellstein / GERMANY
Contact:

Postby RKoschnicke » Thu Jul 20, 2006 08:32

Dear Olivier,
thank you very much for this information. It is very helpful for me!

I like a policy not to announce new products before they are market-ready. But in this case (the current situation isn´t satisfying like the remaining product) I think it is the adequate policy. A new ADAT card will be the very best solution for the described problem.

Best regards - Ralf