Filter
Top Products
Fiber Backbone, Twisted Pair To-The-Desk 2-5
Fiber Backbone,
Twisted Pair
To-The-Desk
When you configure a network with unshielded twisted-pair cabling to
the desk and fiber for the backbone, pay particular attention to the
following rules:
■ You must add a bridge if you need to exceed four full repeater
hops. When traffic goes into a port on any repeater-based module
and out the backplane it counts as a 1/2 repeater. When the traffic
goes into the module through one port and out another port on the
same or a different module, it counts as one full repeater hop.
■ There is an equivalent fiber distance for the 3Com Ethernet fiber
modules (see Rule 4). The equivalent is:
■ 140 meters for signals that enter a fiber module port at the front
panel
■ 50 meters for signals that internally enter a fiber module via the
CoreBuilder 5000 hub backplane
■ There is an equivalent fiber distance for the 24-Port modules (see
Rule 4). The equivalence is:
■ 420 meters for signals that enter the 24-Port module port at the
front panel
■ 165 meters for signals that internally enter a 24-Port module
using the CoreBuilder 5000 hub backplane
Thus, for every pair of 24-Port modules that a signal goes through,
there is a fiber equivalent distance of 585 meters (420 m + 165 m =
585 m) that must be deducted from the overall allowable network
diameter. This is also true if a signal enters the 24-Port module through
one port and exits another port of the same 24-Port module. This
counts as 585 meters of fiber equivalent distance, and as a full repeater
hop.