Cabletron Systems MMAC-5FNB, Networking Manual

Page: 136 / 268

Token Ring
6-16 Single Ring Configuration
An examination of the network and a quick comparison with the table of Token
Ring limitations (Table 6-1) shows that this network is well within specifications
for a passive Token Ring environment. The maximums allowed for a passive
Token Ring operating at 16 Mbps and using Category 5 UTP cable are as follows:
no more than 72 stations, no lobe cables longer than 85 meters. If the network
exceeded any of these requirements, we could have gone back to the initial stages
of the design process and attempted to redesign the Token Ring using active
circuitry TRMIMs.
This network uses UTP cabling with RJ45 connectors, narrowing the choices of
modules to the TRMIM-22 and TRMIM-24. Since there are 31 stations to provide
lobe connections for, the chassis utilizes two TRMIM-24 Token Ring Media
Interface Modules, supplying a total of 48 RJ45 lobe connectors. The chassis that
we are using to network this facility now looks like Figure 6-12.
NOTE
In some cases, the Token Ring network may exceed the
limitations imposed upon even active circuitry modules. In
these cases, redesign the network using multiple Token Rings
and some form of segmentation such as bridging or routing.
Select TRMIMs
Network
Within
Spec?
Use
Active
Circuitry?
no
no
Attempt
Design
Using
Active
Circuitry
yes