INTRODUCTION
CHAPTER 1
INTRODUCTION
1.1INTRODUCTION
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,