Data Sheet

VSC7127/VSC7129

Family of Repeater/Retimer and Port

Bypass Circuits for Fibre Channel

VITESSE

SEMICONDUCTOR CORPORATION

Page 2

G52298-0, Rev 4.3

05/01/01

© VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012

Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: prodinfo@vitesse.com

Internet: www.vitesse.com

Application: Fibre Channel Disk Arrays

A 12-port JBOD is shown in Figure 1. This dual loop application uses 3 VSC7127Xs on each loop in order

to configure the FC-AL disk array. Functional drives are included in the FC-AL loop while non-functional or

missing drives (numbers 2, 7, 9) are excluded.

Figure 1: 12-Drive FC-AL JBOD Application

7125

Optics

or

Copper

SerDes

7125

SerDes

1

0

1

0

1

0

1

0

7125

SerDes

7125

SerDes

1

0

1

0

7125

SerDes

7125

SerDes

1

0

1

0

7125

SerDes

7125

SerDes

1

0

1

0

7125

SerDes

7125

SerDes

1

0

1

0

1

0

1

0

7125

SerDes

7125

SerDes

1

0

1

0

1

0

1

0

7125

SerDes

7125

SerDes

1

0

1

0

7125

SerDes

7125

SerDes

1

0

1

0

7125

SerDes

7125

SerDes

1

0

1

0

Repeater

Retimer

Retimer

Repeater

1

2

3

4

5

6

7

8

9

10

11

12

Optics

or

Copper

LOOP A

LOOP B

CONFIGURATION:

7127R #1 & 2: Repeater Mode

SEL0=1, SEL5=1

7127T #5 & 6: Retimer Mode

SEL1=1, SEL5=1

MODE=0

MODE=1

7127R #3 & 4: Bypass Mode

SEL5=0

MODE=x, No REFCLK

0

1

2

3

4

0

0

1

2

3

4

0

1

1

2

3

4

0