Cabletron Systems THN-MIM - Manual (Page 6)

INTRODUCTION
Page 1-1
CHAPTER 1
INTRODUCTION
1.1 INTRODUCTION
Cabletron Systems Coaxial Media Interface Module (THN-MIM)
provides 12 Ethernet/lEEE 802.3 coaxial cable connectors per module.
When used with the MMAC-8
™ enclosure, up to 84 coaxial segments
can be connected to one MMAC ™ .
The THN-MIM can be mixed with other Media Interface Modules to
provide a variety of different media connections. This means that you
can use a combination of twisted pair, fiber optic, and coaxial cabling
from one MMAC.
Each port on the THN-MIM is repeated by the Intelligent Repeater
Module (IRM). This feature assures data integrity and maximum data
path distance by regenerating and re-timing data packets each time
they enter the MMAC. This feature also assures fault isolation since
the MMAC will segment problem ports from the network
automatically. If a port is segmented, the port will be reconnected
automatically to the network once the port has received a valid data
packet.
Either thick or thin Ethernet cable can be connected to the THN-MIM.
Thin-net cable segments, using 50 ohm Ethernet type cable, can be
connected directly to the module. Each of these segments can be up to
185 meters in length and can support up to 29 users.
Thick-net cable segments made of 50 ohm Ethernet type cable can also
be connected to the modules. A BNC to N-Series adaptor must be used
to convert the thick-net cable to a thin-net cable. Each thick-net
segment can be up to 500 meters in length and can support up to 99
users.
If 12 thick-net segments are connected to a THN-MIM, up to 6000
meters of cable supporting 1024 host systems can be attached to that
one module.
Another model, the THN-MIM7593 is designed for use with 75 or 93
ohm coaxial cable. Thin-net cable segments, using 75 or 93 ohm cable,