Cisco 7000 Series Hardware Installation And Maintenance Manual page 131

Figure 3-15 Dual Attach Station (DAS), Single-Mode Fiber Network Connections
IP
•
Multimode—Each of the integrated transmit/receive multimode interface cables attaches to both
the primary and secondary ring; each one receives the signal from one ring and transmits to the
other ring. (See Figure 3-16.) To help avoid confusion, use the receive label on the cable MIC
connector as a key and connect the cables to the FIP ports as follows:
— Connect the cable coming in from the primary ring to the PHY A receive port. This also
connects the signal going out to the secondary ring to the PHY A transmit port.
— Connect the cable coming in from the secondary ring to the PHY B receive port. This also
connects the signal going out to the primary ring to the PHY B transmit port.
Figure 3-16 Dual Attach Station (DAS), Multimode Fiber Network Connections
FIP
•
Mixed mode—Follow the cabling guidelines described previously to connect the multimode and
single-mode interface cables. Figure 3-17 shows that the primary ring signal is received on the
multimode PHY A receive port and transmitted from the single-mode PHY B transmit port. Your
configuration may be the opposite, with multimode on PHY B and single-mode on PHY A.
Connect the cables to the FIP ports as follows:
— Connect the cable coming in from the primary ring to the PHY A receive port, and connect
the signal going out to the secondary ring to the PHY A transmit port.
— Connect the cable coming in from the secondary ring to the PHY B receive port. This also
connects the signal going out to the primary ring to the PHY B transmit port.
TX RX TX
PHY B
FC connectors (4)
To primary ring
From secondary ring
TX RX TX
PHY B
MIC
To primary ring
From secondary ring
Connecting Interface Cables
Single-mode,
dual attachment.
RX
Use four single-mode
cables for a dual
attachment connection.
PHY A
From primary ring
To secondary ring
Multimode,
dual attachment.
RX
Use two multimode
cables for a dual
attachment connection.
PHY A
MIC
From primary ring
To secondary ring
Installing the Router 3-19