INTRODUCTION
Page 1-2
Appendix A, Basic Token Ring Networks, covers basic operation
and concepts related to the design of token ring networks.
Appendix B, Applications, presents a variety of network
configurations, showing practical applications for several Cabletron
Systems' token ring products.
Appendix C, Calculating Ring Length, describes methods for
calculating various ring cable lengths for passive devices in a token
ring network.
1.2 THE TRMIM-10R
This section outlines some of the basic features of the TRMIM-10R.
The TRMIM-10R, shown in Figure 1-1, is a Media Interface Module
(MIM) that can be installed into a Cabletron Systems' MMAC (Multi
Media Access Center). The TRMIM-10R functions as a ten port
concentrator module in a token ring network providing passive Ring-
In and Ring-Out ports and ten trunk coupling ports.
Twelve DB-9 connectors on the front panel of the TRMIM-10R
provide one Ring-In port, one Ring-Out port for connecting the
TRMIM-10R into a token ring network and ten trunk coupling ports
for attaching ten stations.
The TRMIM-10R supports lobe lengths up to 200 meters at 4 Mbit/sec
and 100 meters at 16 Mbit/sec using IBM Type 1 or Type 2 shielded
twisted pair cable. The supported types and lengths of cables are
listed in Chapter 2, Installation Requirements/Specifications.
The Ring-In/Ring-Out ports provide passive trunk connections using
IBM Type 1 or Type 2 shielded twisted pair cable. Trunk cable
lengths must consider Adjusted Ring Length (ARL). Refer to
Appendix C, Calculating Ring Length, to determine trunk cable
length.
The Flexible Network Bus (FNB
) provides an internal trunk
connection between multiple Cabletron Systems' Token Ring products
operating at the same ring speed and installed in consecutive slots
within the same MMAC. The FNB is an active interface that
regenerates and retimes ring signals between boards on the FNB.
