Connecting Additional Hubs ("Cascading") - HP J2415A Installation And Reference Manual

Connecting Additional Hubs ("Cascading")

To add additional 100VG network ports, HP AdvanceStack 100VG hubs can
be "cascaded" together. To cascade HP 100VG hubs, connect a LAN
downlink port on the upper-level hub to the "Uplink A" port on the
lower-level hub. You can either use one cable or you can add a second cable
to act as a redundant link. For a one or two cable setup, follow these rules:
Cascading Hubs With One Link
Upper-Level Hub
Unbundled 4-Pair LAN Cable
Lower-Level Hub
The type of cable you select depends on the optional transceiver you
install in the upper-level hub. For a twisted-pair connection, use a
standard four-pair LAN port cable. For a fiber connection, see the quick
reference card that is shipped with the hub.
Caution. When connecting a promiscuous end node or cascaded hub,
use an "unbundled" cable. Use of a bundled cable with a promiscuous
device (such as a cascaded hub) will cause signal interference and result
in unreliable operation.
You can use any or all 100VG LAN downlink ports on the upper-level hub
to cascade to an uplink port on a 100VG lower-level hub.
Try to minimize the number of levels of cascaded hubs. We recommend
that you use no more than three levels of cascading (see the 100VG
AnyLAN Technology Guide for more information on topology rules).
Do not exceed the cable lengths specified for your LAN cable (typically
up to 100 meters for category 3 UTP cables). For more information on
cable lengths, see the HP 100VG AnyLAN Technology Guide.
Standard LAN Port ("Downlink")
Uplink A
Installing the HP AdvanceStack Hub
Level 1
Level 2
1-17