3Com SuperStack 3870 Installation Manual

SuperStack
(3C17462)
Installation Guide
Introducing the Stacking Cable
The Stacking Cable enables you to stack together two
switches, up to three rack units apart. You can stack any
combination of 3870 24 and 48 port switches, up to a max-
imum of eight units.
The Stacking Cable is 30 cm (11.8 in.) long and marked
with a yellow label for the Up and a blue label for the
Down D-Type connectors.
Only one switch in the stack can operate as the master
switch, all other switches operate in slave mode. If more
than one switch in the stack is selected as the master, or if
no switches are selected, the stack will not operate.
Figure 1 The Stacking Cable
Up Connector (Yellow Label)
Securing Screws
®
3 Switch 3870 Stacking Cable
Down Connector (Blue Label)
Installing the Stacking Cable
Connect the Stacking Cable as shown in Figure 2.
Always secure the Stacking Cable to the device by tighten-
ing its securing screws.
!
Figure 2 Connecting Switches in a Stack
D O W
N
U P
D O W
N
U P
D O W
N
U P
D O W
N
U P