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DaBear · 14-11-2007, 08:51 PM

EVO PA CITAJTE, ima jos na focusrite web sajtu

http://www.focusrite.com/answerbase/article.php?id=186
Multiple Firewire Busses

The Liquid Mix, like the TC PowerCore and SSL Duende, requires a substantial amount of bandwidth from the firewire bus, especially when it is used to its limit. For this reason, it is beneficial to connect additional firewire devices on a separate firewire bus. Apple Macs which have more than one standard firewire port (400MB/s and/or 800MB/s) are actually running them on the same firewire bus. On a PC, any ports on a single PCI card run on the same bus. In order to add a second firewire bus, it is necessary to install a separate PCI firewire card. In order to ensure that each device is running on its own dedicated bus, it is recommended that a separate firewire bus be added.

For Desktop Macs with PCI (G5) or PCIe (MacPro) slots, this can be achieved by the addition of a PCI or PCIe firewire card. We have tested PCI firewire cards for use with Apple Mac G5s. For Apple laptops with PCMCIA slots, it is possible to add a PCMCIA to firewire adapter. The new Mac Book Pro features an ExpressCard/34 slot, which is planned to replace the current CardBus PCMCIA standard. For more information about Apple Mac firewire ports and buses, you can consult the Apple website. Information about the firewire ports and firewire expansion capabilities of specific Mac models is shown in the table below.

ComputerBuilt In FirewireFirewire expansionRecommended Firewire CardsApple Mac Book1 x 400MB/sNoneN/AApple Mac Book Pro1 x 400MB/s1 ExpressCard/34 slotTexas Intruments & NEC & VIA chipsetsApple Intel Core Duo iMac2 x 400MB/sNoneN/AApple Intel Mac Mini1 x 400MB/sNoneN/AApple Mac Pro2 x 400MB/s,1 x 800MB/s3-4 PCI Express (PCIe) slotsTexas Intruments & NEC & VIA chipsetsMac G4 Powerbook1 x 400MB/s,1 x 800MB/s1 CardBus PCMCIA slotTexas Intruments & NEC & VIA chipsetsMac G5 iMac2 x 400MB/sNoneN/AMac Mini PPC1 x 400MB/sNoneN/AMac G5 Desktop2 x 400MB/s, 1 x 800MB/s3-4 PCI slotsTexas Intruments & NEC & VIA chipsetsMac G4 Desktop2 x 400MB/s3-4 PCI slotsTexas Intruments & NEC & VIA chipsets

Information about Windows XP compatible firewire chipsets is presented in the table below.
Recommended Chipsets are:

Firewire Card ManufacturerFirewire ChipsetOHCI Compliant1394 TypeVIAVT6306 VIA Fire IIYes1394aTexas InstrumentsTSB43AB22Yes1394aNECuPD72874Yes1394a

Focusrite do not recommend using 1394b type firewire chipsets with Liquid Mix. However, if you must, it is recommended that you install a Microsoft firewire driver update for Windows XP SP2 available here:

http://support.microsoft.com/kb/885222

An example of a typical 1394b type card is show in the table below. You can check these specifications on your own system by looking at the device details in the Windows XP Device Manager

Firewire Card ManufacturerFirewire ChipsetOHCI Compliant1394 TypeTexas InstrumentsTSB82AA2/TSB81BA3Yes1394b
Firewire Bus Resets

Firewire bus resets occur when a device is added/removed. Certain firewire devices can also request bus resets for one reason or another. When the firewire bus is resetting, all the devices must re-negotiate for firewire bus bandwidth, so it is possible that at this point if another device requests more or gets in first, a device may fail to allocate space at this time.

After a reset, one device is elected to manage the isochronous resource allocation. It can be a different device each time. If no device is chosen, isochronous data transfer will not work. If a device that is elected does not implement it properly, it could lead to excessive allocation of bandwidth which is not actually available.

Provided that all the devices stick to their allocations, the isochronous data is safe and bandwidth is guaranteed. If any device uses more than it allocates, the system may break down resulting in loss of data. This would probably result in audio crackles and possibly some odd behaviour of remote LCD display or other controls.

Firewire Concepts are discussed in more depth on Apple's website here.

14-11-2007, 08:51 PM	#6
DaBear VIP Member Join Date: May 2006 Location: London UK Posts: 5,794	Re: "LIQUID Mix + PowerCore element" PROBLEM EVO PA CITAJTE, ima jos na focusrite web sajtu http://www.focusrite.com/answerbase/article.php?id=186 Multiple Firewire Busses The Liquid Mix, like the TC PowerCore and SSL Duende, requires a substantial amount of bandwidth from the firewire bus, especially when it is used to its limit. For this reason, it is beneficial to connect additional firewire devices on a separate firewire bus. Apple Macs which have more than one standard firewire port (400MB/s and/or 800MB/s) are actually running them on the same firewire bus. On a PC, any ports on a single PCI card run on the same bus. In order to add a second firewire bus, it is necessary to install a separate PCI firewire card. In order to ensure that each device is running on its own dedicated bus, it is recommended that a separate firewire bus be added. For Desktop Macs with PCI (G5) or PCIe (MacPro) slots, this can be achieved by the addition of a PCI or PCIe firewire card. We have tested PCI firewire cards for use with Apple Mac G5s. For Apple laptops with PCMCIA slots, it is possible to add a PCMCIA to firewire adapter. The new Mac Book Pro features an ExpressCard/34 slot, which is planned to replace the current CardBus PCMCIA standard. For more information about Apple Mac firewire ports and buses, you can consult the Apple website. Information about the firewire ports and firewire expansion capabilities of specific Mac models is shown in the table below. ComputerBuilt In FirewireFirewire expansionRecommended Firewire CardsApple Mac Book1 x 400MB/sNoneN/AApple Mac Book Pro1 x 400MB/s1 ExpressCard/34 slotTexas Intruments & NEC & VIA chipsetsApple Intel Core Duo iMac2 x 400MB/sNoneN/AApple Intel Mac Mini1 x 400MB/sNoneN/AApple Mac Pro2 x 400MB/s,1 x 800MB/s3-4 PCI Express (PCIe) slotsTexas Intruments & NEC & VIA chipsetsMac G4 Powerbook1 x 400MB/s,1 x 800MB/s1 CardBus PCMCIA slotTexas Intruments & NEC & VIA chipsetsMac G5 iMac2 x 400MB/sNoneN/AMac Mini PPC1 x 400MB/sNoneN/AMac G5 Desktop2 x 400MB/s, 1 x 800MB/s3-4 PCI slotsTexas Intruments & NEC & VIA chipsetsMac G4 Desktop2 x 400MB/s3-4 PCI slotsTexas Intruments & NEC & VIA chipsets Information about Windows XP compatible firewire chipsets is presented in the table below. Recommended Chipsets are: Firewire Card ManufacturerFirewire ChipsetOHCI Compliant1394 TypeVIAVT6306 VIA Fire IIYes1394aTexas InstrumentsTSB43AB22Yes1394aNECuPD72874Yes1394a Focusrite do not recommend using 1394b type firewire chipsets with Liquid Mix. However, if you must, it is recommended that you install a Microsoft firewire driver update for Windows XP SP2 available here: http://support.microsoft.com/kb/885222 An example of a typical 1394b type card is show in the table below. You can check these specifications on your own system by looking at the device details in the Windows XP Device Manager Firewire Card ManufacturerFirewire ChipsetOHCI Compliant1394 TypeTexas InstrumentsTSB82AA2/TSB81BA3Yes1394b Firewire Bus Resets Firewire bus resets occur when a device is added/removed. Certain firewire devices can also request bus resets for one reason or another. When the firewire bus is resetting, all the devices must re-negotiate for firewire bus bandwidth, so it is possible that at this point if another device requests more or gets in first, a device may fail to allocate space at this time. After a reset, one device is elected to manage the isochronous resource allocation. It can be a different device each time. If no device is chosen, isochronous data transfer will not work. If a device that is elected does not implement it properly, it could lead to excessive allocation of bandwidth which is not actually available. Provided that all the devices stick to their allocations, the isochronous data is safe and bandwidth is guaranteed. If any device uses more than it allocates, the system may break down resulting in loss of data. This would probably result in audio crackles and possibly some odd behaviour of remote LCD display or other controls. Firewire Concepts are discussed in more depth on Apple's website here.