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2 - 8 ONline 10BASE-T Security Module Installation and Operation Guide
❑ You must add a bridge if you exceed four full repeaters. The
four-repeater rule for Ethernet limits the number of 10BASE-T
modules between any two transceivers. 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. Therefore, you must add a bridge if the
path from one transceiver to another exceeds the four-repeater rule.
❑ The equivalent fiber distance for the ONline Ethernet Fiber Modules
(see Rule 4) is:
– 140 meters for signals that externally enter a Fiber Module
port
– 50 meters for signals that internally enter a Fiber Module
through the ONline Concentrator backplane
❑ The equivalent fiber distance for the Security Module (see Rule 4) is:
– 420 meters for signals that externally enter a Security
Module
– 165 meters for signals that internally enter a Security
Module through the ONline System Concentrator
backplane
For every pair of Security Modules that a signal goes through, deduct a
fiber equivalent distance of 585 meters (420 m + 165 m = 585 m) from the
overall alllowable network diameter. This is also true if a signal makes a
roundtrip through a single Security Module (enters the Security Module
through one port and exits another port of the same Security Module). This
counts as 585 meters of fiber equivalent distance, and as a full repeater.
Fiber Backbone, Twisted Pair To-The-Desk Example
In the sample configuration shown in Figure 2-1, we determine if the
transceivers are within legal Ethernet limits. 22-gauge unshielded twisted
pair cable is used to connect 10BASE-T Transceivers to the Security Modules
in the concentrators.