Placement options and cables 35• When power is applied to the stack the base unit initializes, typicallywithin sixty seconds, and the entire stack powers up as a single logicalunit.• A RS-232 communications cable can be attached to the console port ofany switch in the stack to establish a console connection.• A software upgrade can be performed on the stack from any switchusing the console interface, a Telnet session, the Web-basedmanagement interface, or any SNMP-based management software.• The stack can be managed using a Telnet session, Web-basedmanagement interface, or any SNMP-based management softwarethrough any stack switch port.Cascade downThe system automatically numbers the physical units based on thedesignated base unit (Unit 1). In a cascade down configuration, thebase unit is physically located as the top unit in the stack. The cableconnected to the Cascade Down connector of the base unit terminates inthe Cascade Up connector on the next unit in the stack which is physicallylocated below the base unit. This next unit is designated Unit 2. Thestack is wired downward through the units and the system continues tonumber in this manner throughout the stack. In this configuration, the baseunit discovers the stack in a cascade down (stack down) direction. Thefollowing illustration shows a cascade down (stack down) configuration.ERS 5000 Series InstallationNN47200-300 04.0313 April 2009Copyright © 2008–2009 Nortel Networks
