3Com PS Hub 40, User Manual

Page: 45 / 188

DUA1640-5AAA02
Before You Start 3-5
Connecting PS Hubs (Stacking)
To connect another PS Hub 40 or PS Hub 50 to your hub using the
cascade ports, you need:
■
One cascade cable for each additional hub.
Cascade cables have resilience built into them which protects the
internal segments and management communication that is carried
between the hubs in the stack. You can increase this resilience by using
SuperStack II PS Hub Hot Swap Cascade Units with the cascade cables,
refer to “Using Hot Swap Cascade Units” on
page 3-15
.
Cascade cables are available from your supplier in a variety of lengths,
refer to “Cascade Connections” on page A-6. For information on
connecting another PS Hub to your hub, refer to “Connecting PS Hubs
Together (Stacking)” on page 3-12.
Connecting Different Hubs and Stacks
To connect different hubs or stacks to your hub, you need:
■
One ‘Straight-through’ 10BASE-T cable for each unit or stack —
if using the last port (port 12 or 24) and the MDI/MDIX switch.
■
One ‘Crossover’ 10BASE-T cable for each unit or stack — if using
any 10BASE-T port other than port 24.
For information on connecting a hub or stack to your hub, refer to
“Connecting Different Hubs and Stacks to Your Hub” on page 3-16.
Connecting Management Equipment
For information on what equipment you need to manage the hub,
refer to Chapter 5.