Installation manual

Overview

Segmented

Backplane

In a 7-slot chassis with a segmented backplane, you can install up to six

TurboStack hubs (i.e., one Master and ﬁve manageable modules). The

seventh slot is available for a switch.

As shown in Figure 5, the 7-slot TurboStack department concentrator

chassis incorporates a factory-installed segmented backplane.

In a department concentrator conﬁguration with segmented backplane,

the Master unit provides management through the management bus. The

ﬂow of data to/from each port on an installed hub module and the network

backbone is governed by the switch module in the bottom chassis slot. (As

shown in Figure 5, the backplane receptacle for the switch module is offset

from the other backplane receptacles.)

Master

Module

TurboStack chassis slots are numbered from 1 through 7, top to bottom.

The Master is deﬁned as the module in the lowest-numbered (physically

topmost) occupied chassis slot. Typically this is slot 1, but it could be any

one of slots 2 through 6 if the slot(s) above are vacant.

Backup

Module

A second management-capable hub may be installed in the slot directly

below the Master (except slot 7) to serve as a Backup management unit.

This special module always occupies the next higher-numbered slot

position below the Master so it can immediately take over the Master’s

functions if necessary.

Figure 5: Segmented

Backplane (detail)

SEGMENTED

Segmented

label

Offset

data bus