Installation and Reference Guide HP AdvanceStack 100Base-THub-12TX, Hub-12TXM, and Switch Modules 1997-06

HP Hub-12TX/Hub-12TXM Installation and Reference Guide
Setting Up Network Connections 3-5
Sample Network Configurations
The AdvanceStack Hub-12TX/Hub-12TXM hubs are designed
to provide flexibility in configuring network connections. This
hub can be used as a simple standalone hub or connected to
other network interconnection devices in various configurations.
This section includes sample applications, most of which take
advantage of the hub’s isolation technique, using the Switch
Port Modules. Pay attention to the examples that illustrate how
to isolate a hub from the stack.
Connecting Hubs to the Stack
All hubs in a stacked system are by definition connected with
the Stacking Cable. In this example, a stacked system using the
Stacking Cable through the Stacking Ports, connects five hubs
together in a single collision domain.
Note that connecting all hubs in the same stack groups all nodes
attached to the stack in a single collision domain. All Ethernet
frames transmitted by any node are seen by every other node in
the stack. For a heavily loaded network, you can significantly
improve performance by isolating a hub from the stack. For
more information on isolating a hub, see the next procedure.
Figure 3.1 Attaching All Hubs to the Stack Collision Domain