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Cable fault Autowrap on fiber optic trunk ports
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Multi Ring Out connectivity for passive MAU workgroups
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LANVIEW LEDs for "at-a-glance" diagnostic monitoring
1.2.1
Ring In/Ring Out Ports
The dual multimode fiber Ring Port sets (Ring Ports 1 and Ring Ports 2)
support two fully redundant ring extensions to other hubs up to 2 Km
away from the MMAC. As shown in Figure 1-2, each Ring Port set consists
of four ST connectors—a pair of Transmit and Receive ports for Ring In
and another pair for Ring Out.
RING 2 16Mb
IN USE
RING 3 16Mb
IN USE
RING 4 16Mb
IN USE
IN USE
AUX 1 16Mb
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
With these Ring Ports, two otherwise isolated Token Rings may be joined
via two cable sets—one Ring In and one Ring Out. This is known as a fully
redundant connection because, as both cable sets contain a Transmit line
and a Receive line, either cable set is capable of maintaining the connection
without the other. Under normal operating conditions, only half of each
cable set is active—the Transmit line on the Ring Out set and the Receive
line on the Ring In set. If either cable set fails, the other maintains the ring
connection by automatically activating the second line in its
Receive/Transmit pair to provide a backup path.
Refer to Section 1.2.3, Cluster Switching, for details about FNB Ring
assignments.
1 Ring Ports set = 4 cable connections
Transmit
Receive
Transmit
Receive
Figure 1-2. One Ring Port Set
About the TDRMIM
Ring In
Ring Out
Ring Ports 1
Page 1-3
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