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Automatic Mode
When a bypass card is jumpered to operate in Automatic mode, it monitors both of its
external connectors. If it detects that at least one of its connectors is connected to a
powered-on SSA attachment or device, it switches to Inline state; that is, it connects the
internal SSA links to the external connector.
If the bypass card detects that neither of its connectors is connected to a powered-on
SSA attachment or device, it switches into Bypass state; that is, it connects the internal
strings together, and disconnects them from the external connectors. Therefore, when a
7133 that has all its bypass cards jumpered for Automatic mode is not connected
externally, all 16 disk drive module slots are connected in one internal SSA loop.
In figures 23 and Figure 24 on page 43, two strings of four disk drive modules in a 7133
are connected to two SSA adapters. If power is on at both adapters, the loop is
connected as shown in Figure 23:
Adapter 1
A
1
16
13
Disk
Disk
16
15
Disk
Disk
1
2
Figure 23. Automatic Mode: Power at Both SSA Adapters
42
7133 Models D40 and T40 Service Guide
B
12
Disk
Disk
14
13
Disk
Disk
3
4
Adapter 2
A
B
4
Disk
Disk
Disk
Disk
12
11
10
9
Disk
Disk
Disk
Disk
5
6
7
8
5
9
8
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