Alcatel OS6850-P48 User Guide - Page 180

Stack Cabling Managing OmniSwitch 6850/6850E Series Stacks Stack Cabling Switches in a stack are connected to each other by stacking cables. The stacking cables come in various sizes as listed below and provide high-speed, dual-redundant links between switches in a stack. Cable Description OS6850-CBL-30 30 centimeters long stacking cable. OS6850-CBL-60 60 centimeters long stacking cable. OS6850-CBL-150 150 centimeters long stacking cable. OS6850-CBL-300 300 centimeters long stacking cable. (Supported on the 24 port models only.) Stacking Cables Stacking cables for can be connected in any pattern. In other words, the cable connected to stacking port A of one switch can be connected to either stacking port A or stacking port B of the adjacent switch. However, it is strongly recommended that the cabling pattern remains consistent across the stack. In addition, for a stack to have effective redundancy, a redundant stacking cable must be installed between the upper-most and bottom-most switch at all times. This provides effective failover in the event of a stacking link or module failure within the stack. The diagram below shows two recommended stacking cable patterns. For detailed information on assembling a stack and connecting the cables, refer to Chapter 2, "OmniSwitch 6850 Series Chassis and Hardware Components." page 6-18 OmniSwitch 6850/6850E Series Hardware Users Guide June 2011