BASIC TOKEN RING NETWORKS
Page A-5
case of Cabletron Systems’ Token Ring Repeater (TRRMIM-16),
convert from one media type to another (eg. shielded twisted pair to
fiber optic).
Converters (not illustrated) provide the means for changing from
one media type to another. Usually, the conversion allows a
particular ring segment to cover a greater distance. Converters
typically regenerate and retime signals as part of their functions.
Bridge devices (not illustrated) connect rings that cannot be
expanded (at their maximum number of stations) or rings that are
operating at different speeds (4 Mbit/sec vs. 16 Mbit/sec). They do not
expand a single network, rather they connect multiple networks
together. They maintain routing information, filter messages that
cross the bridge, regenerate signals and provide buffering required for
network synchronization.
Figure A-3. Repeaters In a Token Ring
Ring-In
Ring-Out
Ring-Out
Concentrator #1
Concentrator #2
Ring-In
MAIN RING
MMAC
Chassis
TRMIM-10R
MMAC
Chassis
Ring-Out
Ring-In
TRRMIM-16
Repeater
TRMIM-12
TRC-800