VITESSE
SEMICONDUCTOR CORPORATION
Data Sheet
Family of Repeater/Retimer and Port
Bypass Circuits for Fibre Channel
VSC7127/VSC7129
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
Optics
or
Copper
1
Retimer
LOOP A
Retimer
0
0
0
0
1
1
1
1
7125
SerDes
7125
1
0
0
0
0
1
1
1
1
0
SerDes
2
3
4
7125
SerDes
7125
3
2
SerDes
7125
SerDes
7125
4
CONFIGURATION:
7127R #1 & 2: Repeater Mode
SEL0=1, SEL5=1
SerDes
1
0
0
0
0
1
1
1
1
7125
SerDes
7125
0
5
6
0
0
0
0
1
MODE=0
4
3
SerDes
7125
SerDes
7125
7127R #3 & 4: Bypass Mode
SEL5=0
MODE=x, No REFCLK
1
1
1
SerDes
7
8
2
7127T #5 & 6: Retimer Mode
SEL1=1, SEL5=1
MODE=1
7125
SerDes
7125
1
SerDes
0
9
0
0
0
0
1
1
1
1
0
0
0
0
0
1
4
3
7125
SerDes
7125
10
11
12
1
1
1
SerDes
7125
SerDes
7125
2
SerDes
7125
SerDes
7125
Optics
or
Copper
1
SerDes
LOOP B
Repeater
Repeater
0
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Page 2
G52298-0, Rev 4.3
05/01/01
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