INTRODUCTION
Page 1-2
Chapter 4, Testing and Troubleshooting, describes LANVIEW
,
Cabletron Systems’ built-in visual diagnostic and status monitoring
system, and gives procedures for verifying the proper installation of
the TRMIM-20R.
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 in a passive token ring
network.
1.2 THE TRMIM-20R
The TRMIM-20R, shown in Figure 1-1, is a Media Interface Module
(MIM) that can be installed into a Cabletron Systems’ MMAC-8FNB,
MMAC-8, MMAC-5FNB, MMAC-3FNB or MMAC-3.
The TRMIM-20R functions as a ten port concentrator in a token ring
network providing passive Ring-In and Ring-Out ports and ten trunk
coupling ports.
The TRMIM-20R provides two DB-9 and ten RJ-45 connectors on the
front panel. Two DB-9 connectors permit attachment for shielded
twisted pair (STP) Ring-In and one Ring-Out trunk cabling. Ten
unshielded twisted pair (UTP), RJ-45 connectors support trunk
coupling ports for up to ten token ring stations.
The Ring-In and Ring-Out ports support IBM Type 1, 2, 6 and 9 STP
cable. Each of the TRMIM-20R trunk coupling unit ports supports
station connections via voice grade UTP.
Since the Ring-In and Ring-Out ports are passive trunk connections,
trunk cable length must be calculated giving consideration to
Adjusted Ring Length (ARL). Refer to Appendix C, Calculating
Ring Length, to determine trunk cable length.
