3-18 Cisco 7010 Hardware Installation and Maintenance
Connecting Interface Cables
Figure 3-13 Single Attach Station (SAS), Multimode Fiber Network Connections
Dual Attach Connections
A FIP that is connected as a dual-attach station (DAS) connects to both the primary and secondary
rings. The signal for each ring is received on one physical interface (PHYA or PHY B) and
transmitted from the other. The standard connection scheme (which is shown in Figure 3-14) for a
DAS dictates that the primary ring signal comes into the FIP on the PHYA receive port and returns
to the primary ring from the PHY B transmit port. The secondary ring signal comes into the FIP on
the PHY B receive port and returns to the secondary ring from the PHYA transmit port. Failure to
observe this relationship will prevent the FDDI interface from initializing. Figure 3-17 shows the
connections for a dual attachment that uses both multimode and single-mode fiber.
Figure 3-14 FDDI DAS Ports
Depending on whether you are connecting to a single-mode or multimode fiber network, connect the
FIP as follows:
• Single-mode—Observe the standard connection scheme described previously, and refer to
Figure 3-15 while you connect the interface cables as follows:
— Connect the cable coming in from the primary ring (from PHY B at the primary ring
upstream station) to the FIP PHYA receive port.
— Connect the cable going out to the primary ring (to PHYA at the primary ring downstream
station) to the FIP PHY B transmit port.
— Connect the cable coming in from the secondary ring to the FIP PHY B receive port.
— Connect the cable going out to the secondary ring to the FIP PHYA transmit port.
TX RX
PHY B PHY A
H2807
To/from
primary ring
FIP
Multimode,
single attachment.
Use one multimode cable
for a single attachment
connection.
MIC
TX RX
TX
RX
PHY
A
RX
PHY
B
TX
Secondary Secondary
Primary Primary
FORMAC
H1550a
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