2 - 10 ONline 10BASE-T Security Module Installation and Operation Guide
Do not exceed the distances as defined in Table 2-2 for the link from a
Security Module to a 10BASE-T Transceiver.
Twisted Pair Backbone, Twisted Pair To-The-Desk
In constructing a twisted pair backbone, one additional configuration rule
must be considered. Ensure there are no more than eight Security Modules
in the path between any two transceivers due to Ethernet's four-repeater
rule. This is because each Security Module counts as a 1/2 repeater unless
the signal goes in one port and out another port of the same module, in
which case the module counts as a full repeater.
If you have more than eight Security Modules serially connected, add a
bridge. Each bridge creates a subnetwork. Each subnetwork can have its
own 420 meter network diameter.
The configuration in Figure 2-2 illustrates a possible unshielded twisted pair
network using 22 gauge cable.
Table 2-3. Maximum Link Distance on Twisted Pair
Cable Gauge Supports Link Distances Up To:
Unshielded Twisted Pair:
10BASE-T
Normal Squelch
22 (.6 mm) 100 m
24 (.5 mm) 100 m
