Connecting Lobe Cabling
Page 3-7
A Type 3 Media Filter must be used
when connecting the UTP lobe
cable from either of the active UTP TRXMIMs (TRXMIM-22A/24A) to a
Token Ring station that is not equipped with an internal filter. A Type 3
Media Filter, such as the Cabletron Systems TRMF, provides impedance
matching from the Type 3 (UTP) lobe cabling to the Type 1 (STP) interface
provided with many Token Ring stations.
The lobe cabling used with the TRXMIM-42A/44A requires
shielded RJ-45 connections to attain the maximum lobe lengths
listed in Chapter 2, Installation Requirements & Specifications.
Shielded patch cables that adapt a shielded RJ-45 to a Data
Connector (MIC) are available from Cabletron Systems. These
adapter/patch cables permit connection to a pre-existing patch
panel equipped with data connectors (see Figure 3-10).
Figure 3-10. Token Ring Station Cable Wiring Schematic
Token Ring Station
STP lobe cable
TRXMIM-42A/44A
TX+
TX–
RX+
RX–
TX+
TX–
RX+
RX–
Shield
Shield
4
5
6
3
RJ-45 plug
TX+
TX–
RX+
RX–
TCU port
RJ-45 jack
6
3
4
5
O
B
R
G
O
B
R
G
TX+
TX–
RX+
RX–
TX+
TX–
RX+
RX–
9
5
1
6
MIC / MIC
9
5
1
6
Male DB-9
NIC port
Female DB-9
MIC coupling
shield
Shield
Shield
shield
STP jumper cable
TX+
TX–
RX+
RX–
6
3
4
5
Token Ring Station
TX+
TX–
RX+
RX–
4
5
6
3
TYPE 3
MEDIA
FILTER
TX+
TX–
RX+
RX–
1
6
9
5
UTP Lobe Cable
RJ-45 plugs
4
5
6
3
TX+
TX–
RX+
RX–
TRXMIM-22A/24A
TCU port
RJ-45 jack
(internal
or
external)
NIC port
female DB-9
