VSC7124 Datasheet, PDF (2/8 Pages) Vitesse Semiconductor Corporation – Quad Port Bypass Circuit

Quad Port Bypass Circuit
VITESSE
SEMICONDUCTOR CORPORATION
Advance Product Information
VSC7124
Application Example
A 12-port JBOD is shown in Figure 1. This dual loop application uses one VSC7127R, one VSC7127T and one
VSC7124 on each loop in order to configure the FC-AL disk array. Functional drives are included in the FC-
AL loop while nonfunctional or missing drives (numbers 2, 7, 9) are excluded.
Figure 1: 12-Drive FC-AL JBOD Application
Optics
or
Copper
LOOP A
CONFIGURATION:
VSC7127R #1 & 2: Repeater Mode
SEL0=1, SEL5=1
MODE=0
VSC7124 #3 & 4: No CRU
VSC7127T #5 & 6: Retimer Mode
SEL1=1, SEL5=1
MODE=1
Optics
or
Copper
LOOP B
1
Retimer
Retimer
01
7125
1
SerDes
01
0
7125
SerDes
01
2
01
4
01
3
01
2
1
0
01
4
01
3
01
2
01
01
01
01
01
7125
SerDes
3
7125
SerDes
7125
SerDes
4
7125
SerDes
7125
SerDes
5
7125
SerDes
7125
SerDes
6
7125
SerDes
7
01
7125
SerDes
8
01
1
7125
SerDes
0
0
01
9
01
4
01
3
01
2
01
1
01
01
01
7125
SerDes
10
7125
SerDes
7125
11
SerDes
7125
SerDes
7125
12
SerDes
7125
SerDes
Repeater
Repeater
0
Page 2
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Internet: www.vitesse.com
G52293-0, Rev 2.3
5/7/01