HP J2415A Installation And Reference Manual page 74

Hub Reference
Reset Button
The Reset button resets the hub and performs the power-on self-test. It is
recessed to prevent accidental resets. For a description of the effect of this
reset, see page 2-15.
Distributed Management Chain Extension Ports
The Extension ports are used for chaining multiple hubs together on a
special bus called the Distributed Management Chain. This chain is
independent of any LAN connections, and allows you to manage multiple
hubs from a single management station. Chained hubs can be adjacently
located or physically distributed. The chain can extend up to a total
distance of 185 meters and can connect up to 16 AdvanceStack hubs.
For chaining, standard unshielded twisted-pair cables with RJ-45 connectors
are used. Refer to appendix A for detailed cable information.
Access to hubs on a Distributed Management Chain is accomplished in two
ways:
RS-232 Console Port
A hub's Distributed Management console port is a standard RS-232 serial link
used to connect a Windows-based PC running HP Stack Manager. The
connection can be a direct serial connection, a remote connection using a
modem link, or a connection through a data switching device.
If the hub is connected to other hubs on a Distributed Management Chain,
the console port PC (running HP Stack Manager) can access any hub on the
chain.
4-4
Out-of-Band Management: From a Windows-based PC (running
HP Stack Manager) connected to an RS-232 Console Port on one of the
hubs in the chain.
In-Band Management: From a network management station running a
supported network management utility. For in-band management, an
Expansion Slot module that supports SNMP (Simple Network
Management Protocol) must be installed in at least one of the HP 100VG
hubs in the chain. For more information, refer to the Hub Management
section later in this chapter.