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Welcome to the Token Ring Dual Port Repeater/Concentrator Switching
Media Interface Module User's Guide. This manual is a reference for the
installation and troubleshooting of Cabletron Systems' TDRMIM-22A and
TDRMIM-42A modules, represented in Figure 1-1.
The TDRMIM is an active cluster-switching twisted pair concentrator with
dual multimode fiber Ring In/Out repeater ports for Token Ring
expansions. The IEEE 802.5 compliant and IBM compatible TDRMIM is
designed for installation into any Cabletron Systems Multi Media Access
Center (MMAC) equipped with a Flexible Network Bus (FNB).
Figure 1-1. TDRMIM -22A and TDRMIM-42A
CHAPTER 1
Introduction
TDRMIM-22A
SN
ERR
BYP
MGMT
RING 1 16Mb
IN USE
RING 2 16Mb
IN USE
IN USE
RING 3 16Mb
RING 4 16Mb
IN USE
AUX 1 16Mb
IN USE
AUX 2 16Mb
IN USE
1
7
2
8
3
9
4
10
5
11
6
12
1
LNK
PEN
x
2
TX
x
RI
R
I
RX
3
N
x
G
P
O
4
R
x
T
LNK
PEN
S
1
5
TX
x
RO
6
RX
x
LNK
PEN
7
x
TX
8
RI
x
R
I
RX
N
G
9
x
P
O
R
T
10
S
LNK
PEN
x
2
TX
11
RO
x
RX
12
x
DUAL FIBER REPEATER
UTP TOKEN RING
TDRMIM-42A
SN
ERR
BYP
MGMT
RING 1 16Mb
IN USE
RING 2 16Mb
IN USE
IN USE
RING 3 16Mb
RING 4 16Mb
IN USE
AUX 1 16Mb
IN USE
AUX 2 16Mb
IN USE
1
7
2
8
3
9
4
10
5
11
6
12
1
LNK
PEN
x
2
TX
x
RI
R
I
RX
3
N
x
G
P
O
4
R
x
T
LNK
PEN
S
1
5
TX
x
RO
6
RX
x
LNK
PEN
7
x
TX
8
RI
x
R
I
RX
N
G
9
x
P
O
R
T
10
S
LNK
PEN
x
2
TX
11
RO
x
RX
12
x
DUAL FIBER REPEATER
STP TOKEN RING
Page 1-1
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