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3-6
Installing the Hub
Writer:
Chris Seiter
Project:
Installing the Hub
Comments:
299440-001
File Name:
2824_3.DOC
Last Saved On:
6/26/97 11:00 AM
Interconnecting Hubs
You can interconnect two manageable 2724 hubs to create an unmanaged stack.
Or, you can interconnect up to four manageable 2724 hubs with one managing
2824 hub for a fully managed stack. You can also interconnect the 2724 and
2824 hubs with Netelligent 2524 (manageable) and 2624 (managing) hubs.
NOTE
: Only one managed hub (2824 or 2624) is allowed in a single stack.
CAUTION:
It is recommended that you power down the 2724/2824 stack
before you add another hub to the stack. Adding a hub with the stack
powered on could create unpredictable results.
You can place the 2824 hub in any position (top, middle, bottom) in a two- to
five-hub stack. The 2824 hub has an expansion interface that consists of four
68-pin backplane connection cables (EXPN PORT A, B, C, and D) on the hub's
back panel.
The 2724 hub has one 68-pin backplane connection cable (EXPN PORT) and
three dip switches for UNM/MAN, HOST/TARGET, and SW EN/SW DIS
settings. The switch settings are described in the section “2724 Dip Switch
Settings” in this chapter.
If possible, mount the hubs on a rack or place them on a stable mounting
surface with the supplied rubber feet affixed before you attach the backplane
connection cable. This helps ensure the correct spacing between hubs and helps
prevent stretching and possibly damaging the backplane connection cable
during installation.
2724 Dip Switch Settings
The dip switches on the back of the 2724 hub come factory pre-set so that you
can create a managed stack of up to five hubs (one to four 2724 hubs and one
2824 hub). Or, by reconfiguring the dip switches, you can create an unmanaged
stack of two 2724 hubs. The dip switch settings are described below:
IMPORTANT:
Incorrectly setting the dip switches will
not
damage the hubs, but
may affect switch management.