Connecting Stacking Cables; Fastening The Switch To The Rack - Enterasys SecureStack A2 A2H254-16 Hardware Installation Manual

2. With the mounting brackets attached, position the switch between the vertical frame
members of the 19‐inch rack as shown in Figure 3‐7. Then fasten the switch securely
to the frame using four mounting screws (user supplied).
Figure 3-7
1 Rails of 19-inch rack
3. If you are installing this switch in a stacked configuration, repeat this procedure for
each switch until all switches have been installed in the stack, then proceed to
"Connecting Stacking Cables" on page 3‐11. Otherwise, proceed to "Connecting AC
and RPS‐SYS Power" on page 3‐15.

Connecting Stacking Cables

The stack of switches can be connected in a closed loop or daisy chained. In a closed loop
all the switches are connected in sequence and the last switch in the stack is connected
back to the first switch. In a daisy chain configuration the cable that would return the
connection back to the first switch in a closed loop is not installed. The advantage of the
closed loop is redundancy, this configuration eliminates any single point of failure. Up to
eight switches can be stacked together and connected by standard UTP Category 5 or
better cables. The stacking cables allow the entire stack to operate with a single IP address.
Figure 3‐8 shows an example of a four‐high stack connected in a closed loop
configuration. All STACK DOWN and STACK UP connectors are used in the installation.
The stacking cable connections are from the STACK DOWN connector of one switch to
the STACK UP connector of the next switch up in the stack. A stacking cable connection
from the STACK DOWN connector of the switch at the top of the stack to the STACK UP
connector at the bottom of the stack closes the loop. In a daisy chain configuration, one
cable connection is not made.

Fastening the Switch to the Rack

2 Mounting screws (supplied by user)
SecureStack A2 Installation Guide

Connecting Stacking Cables

3-11