User`s guide

Chapter 2: Network Planning and Configuration
Page 2-4 IRM3 User’s Guide
2.2.1 Media Interface Modules
The following is a description of the types of Cabletron Systems MIMs
that can be installed in the MMAC and managed by the IRM3.
THN-MIM Thin Coaxial Module
The THN-MIM has 12 Ethernet/IEEE 802.3 compliant attachments to
either thin or thick coaxial cable through a thick-to-thin adapter. The thin
coaxial segment, which may be up to 185 meters in length, can
accommodate up to 29 connections per segment. The thick coaxial
segment may extend to 500 meters in length and provide up to 99
connections.
MT8-MIM Multiport Transceiver Interface Module
The MT8-MIM provides eight separate transceivers in one unit that can
be inserted into the MMAC. The MT8-MIM provides eight IEEE
802.3-compatible medium attachment unit (MAU) ports, which allows a
direct connection to any type of media.
TPMIM 10BASE-T Modules
Cabletron Systems TPMIM 10BASE-T modules are available with 12 or
24 ports equipped with DB9, RJ45, or RJ71 connectors for
shielded/unshielded twisted pair connections of up to 125 meters in
length.
FOMIM Fiber Optic Modules
Cabletron Systems FOMIM fiber optic modules are available with 6, 12
or 18 ports equipped with either ST (straight tip) or SMA (subminiature
type A) connectors, with models that support either single mode or
multimode cable. The FOMIMs provide Ethernet/IEEE 802.3 Fiber Optic
Inter Repeater Link (FOIRL) compatible attachments over 50, 62.5 or 100
µm core multimode fiber cabling, or 8/125 - 12/125 µm core single mode
cabling. Each port of the multimode modules can drive fiber optic link
segments up to 2 km in length. Each port on the single mode modules can
drive fiber segments up to 10 km, provided that system budgets are met.