Hard drive computer apollo 16, Computer, Apollo 16 fw repeater hard drive hard drive – Universal Audio Apollo 16 User Manual

Page 25: Fw800, Firewire bus connections via repeater, Firewire bus connections via daisy chain

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Apollo 16 Hardware Manual

FireWire Basics

25

Mixing FireWire Speeds
Although FireWire 400 and FireWire 800 devices can be connected to the same FireWire bus via a repeater or
daisy chain, special precautions must be observed to maximize bandwidth in these situations.

FireWire 800 devices on a FireWire 400 bus

FireWire 800 devices are backwards-compatible and can be connected to a FireWire 400 bus using a 9-pin to
6-pin FireWire cable or adapter. However in this scenario any 800 megabit-capable devices on the bus (includ-
ing Apollo 16) will operate at a maximum of 400 megabits because FireWire bandwidth cannot exceed the
maximum bus speed of the host computer.

FireWire 400 devices on a FireWire 800 bus

FireWire 400 devices can be connected to a FireWire 800 bus using a 6-pin to 9-pin FireWire cable or adapter.
However, if the FireWire 800 devices are located after the FireWire 400 devices in the daisy chain, all FireWire
devices will operate at a maximum of 400 megabits because the FireWire 400 devices force all subsequent
devices to run at FireWire 400 speeds.

FireWire bus connections via repeater

Computer

Hard Drive

Hard Drive

Apollo 16

FW Repeater

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FireWire bus connections via daisy chain

Hard Drive

Computer

Apollo 16

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Computer

FireWire bus connections via repeater and daisy chain in a “tree chain”

Apollo 16

FW Repeater

Hard Drive

Hard Drive

METER I/O

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This FireWire bus runs @ 400 MB because host computer is FW400

FW400

FW800

FW800

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This FireWire bus runs @ 400 MB because 1st device in chain is FW400

FW800

FW800

FW800

FW400

FW bus @ 400 MB

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This FireWire bus runs @ both 800 MB and 400 MB because the

FW400 device is located AFTER the FW800 devices in the chain

FW bus @ 800 MB

FW bus @ 400 MB

FW800

FW800

FW800

FW400

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FireWire bus connections via repeater

Computer

Hard Drive

Hard Drive

Apollo 16

FW Repeater

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POWER

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FireWire bus connections via daisy chain

Hard Drive

Computer

Apollo 16

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OFF

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Computer

FireWire bus connections via repeater and daisy chain in a “tree chain”

Apollo 16

FW Repeater

Hard Drive

Hard Drive

METER I/O

POWER

OFF

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This FireWire bus runs @ 400 MB because host computer is FW400

FW400

FW800

FW800

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This FireWire bus runs @ 400 MB because 1st device in chain is FW400

FW800

FW800

FW800

FW400

FW bus @ 400 MB

METER I/O

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This FireWire bus runs @ both 800 MB and 400 MB because the

FW400 device is located AFTER the FW800 devices in the chain

FW bus @ 800 MB

FW bus @ 400 MB

FW800

FW800

FW800

FW400

METER I/O

POWER

OFF

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-9

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FireWire bus connections via repeater

Computer

Hard Drive

Hard Drive

Apollo 16

FW Repeater

METER I/O

POWER

OFF

METER

1

2

3

4

5

6

7

8

C
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-9

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FireWire bus connections via daisy chain

Hard Drive

Computer

Apollo 16

METER I/O

POWER

OFF

METER

1

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EXT

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MONITOR

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0

-6

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-9

-12

-15

-18

-21

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Computer

FireWire bus connections via repeater and daisy chain in a “tree chain”

Apollo 16

FW Repeater

Hard Drive

Hard Drive

METER I/O

POWER

OFF

METER

1

2

3

4

5

6

7

8

C
0

-6

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-9

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RATE

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192

9

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C
0

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HOST

CLOCK

INT
EXT

METER

IN

OUT

MONITOR

1

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C
0

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-9

-12

-15

-18

-21

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This FireWire bus runs @ 400 MB because host computer is FW400

FW400

FW800

FW800

METER I/O

POWER

OFF

METER

1

2

3

4

5

6

7

8

C
0

-6

-3

-9

-12

-15

-18

-21

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88.2

RATE

44.1

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176.4

96

192

9

10

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12

13

14

15

16

C
0

-6

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-9

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-15

-18

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-27

HOST

CLOCK

INT
EXT

METER

IN

OUT

MONITOR

1

2

C
0

-6

-3

-9

-12

-15

-18

-21

-27

This FireWire bus runs @ 400 MB because 1st device in chain is FW400

FW800

FW800

FW800

FW400

FW bus @ 400 MB

METER I/O

POWER

OFF

METER

1

2

3

4

5

6

7

8

C
0

-6

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-9

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88.2

RATE

44.1

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176.4

96

192

9

10

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12

13

14

15

16

C
0

-6

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-9

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-27

HOST

CLOCK

INT
EXT

METER

IN

OUT

MONITOR

1

2

C
0

-6

-3

-9

-12

-15

-18

-21

-27

This FireWire bus runs @ both 800 MB and 400 MB because the

FW400 device is located AFTER the FW800 devices in the chain

FW bus @ 800 MB

FW bus @ 400 MB

FW800

FW800

FW800

FW400

METER I/O

POWER

OFF

METER

1

2

3

4

5

6

7

8

C
0

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-9

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RATE

44.1

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176.4

96

192

9

10

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14

15

16

C
0

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HOST

CLOCK

INT
EXT

METER

IN

OUT

MONITOR

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0

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