3Com CoreBuilder 3500 Getting Started Manual page 45

For more information about dual-attached stations,
see the CoreBuilder 3500 Implementation Guide.
To cable the module as a dual-attached station:
Read and follow the "Fiber and Laser Safety
1
Precautions" on page 35 for safe operation.
Configure a DAS connection on your FDDI module.
2
This connection involves configuring the ports that
you are working with to support DAS mode. See the
fddi stationMode modify
Reference Guide.
Connect the cable coming in from the primary ring
3
(from Port B of the preceding DAS station) to Port A
of the DAS connection on the FDDI module, as shown
in Figure 22. This connection also connects the signal
going out to the secondary ring to Port A.
When a module port is properly connected, the port's
Link status (L) LED lights.
Each FDDI port consists of a transmit and receive side.
For each FDDI port-to-port connection, verify that you
cable the transmit side of one FDDI port to the receive
side of the FDDI port to which you are connecting;
and the receive side of one port to the transmit side
of the other.
Connect the cable coming in from the secondary ring
4
(from Port A of the preceding DAS station) to Port B
of the DAS connection on the FDDI module, as shown
in Figure 22. This connection also connects the signal
going out to the primary ring to Port B.
When a module port is properly connected, the port's
Link status (L) LED lights.
command in the Command
Figure 22 Cabling the DAS Connection
DAS port A
DAS port B
MODEM
TERMINAL
INS
C
100 BASE - FX
1X
L
3C54321
E
T
PWR
4X
INS L
E
ERR
T
Incoming
primary
cable
Repeat steps 1 through 4 for additional DAS
5
connections.
For a complete list of FDDI connection policies, see
the FDDI chapter in the CoreBuilder 3500
Implementation Guide.
Cabling FDDI Modules 45
ETHERNET
10BT
2X 3X
L L
E E
T T
5X 6X
L
L
E E
T T
Incoming
secondary
cable