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11
Installing the Express Hub
CHAPTER 2
Stacking Hubs
You can install a maximum of six hubs in an equipment rack or on a
shelf or a table. Once the hubs are stacked and secured, connect them
using Intel cascade cables. The cascade cable is a unique cable for
Express Stackable Hubs.
If you install an optional Network Management Module (NMM), it
assigns unit numbers starting from the top of the stack. Position the hub
you want to designate number 1 at the top of the stack.
Notes on cascading
A stack of hubs functions as a single repeater or collision domain. The
cascade cables form a cascade bus that carries the following
information to each hub in the stack:
• Stack management information that allows one NMM to manage
every hub in a stack.
• Port statistics that distribute configuration and status information
for each port in the stack to an NMM and network management
system.
• Daisy chain unit number information that provides a sequential
numbering convention for a stack of up to six hubs. For
information about the unit numbering convention, see “Unit
Numbering Convention” in Chapter 3.
• Network data.
NOTE
If you include Intel Express
100BASE-TX and 100BASE-T4
Stackable Hubs in the same
stack, make sure you attach
only the appropriate devices
(TX or T4) to each type of
hub.
NOTE
Use Intel cascade cables to
connect Express Stackable
Hubs. Do not use UTP cabling
to connect hubs.