Cisco CATALYST 5500 9 PORT GIGABIT ETHERNET SWITCH MODULE Guia De Especificação
Connecting Modules
Catalyst 5000 Family Module Installation Guide
3-18
Making Dual-Attachment Connections
FDDI and CDDI modules that are connected as DASs connect to both the primary and
secondary rings. The signal for each ring is received on one physical interface (PHY A or
PHY B) and transmitted from the other. The standard connection scheme (see Figure 3-12
and Figure 3-13) for a DAS dictates that the primary ring signal comes into the FDDI or
CDDI module on the PHY A receive port and returns to the primary ring from the PHY B
transmit port. The secondary ring signal comes into the FDDI or CDDI module on the
PHY B receive port and returns to the secondary ring from the PHY A transmit port.
secondary rings. The signal for each ring is received on one physical interface (PHY A or
PHY B) and transmitted from the other. The standard connection scheme (see Figure 3-12
and Figure 3-13) for a DAS dictates that the primary ring signal comes into the FDDI or
CDDI module on the PHY A receive port and returns to the primary ring from the PHY B
transmit port. The secondary ring signal comes into the FDDI or CDDI module on the
PHY B receive port and returns to the secondary ring from the PHY A transmit port.
Caution
If you fail to observe this relationship, your FDDI or CDDI interface
might not initialize.
Each integrated transmit/receive multimode interface cable attaches to both the primary and
secondary ring; each cable receives the signal from one ring and transmits to the other ring.
To avoid confusion, use the receive label on the cable connector as a key and connect the
cables to the FDDI/CDDI module ports as described above.
secondary ring; each cable receives the signal from one ring and transmits to the other ring.
To avoid confusion, use the receive label on the cable connector as a key and connect the
cables to the FDDI/CDDI module ports as described above.
Figure 3-12 shows the FDDI dual-attachment connections for both MMF and SMF using
MICs and straight-tip (ST) connectors. Figure 3-13 shows the CDDI dual-attachment
connections using two RJ-45 connectors.
MICs and straight-tip (ST) connectors. Figure 3-13 shows the CDDI dual-attachment
connections using two RJ-45 connectors.
Figure 3-12
FDDI Module Dual-Attachment Network Connections
FDDI MODULE MMF
STATUS
H2993
RING OP THRU
WRAP A WRAP B
A
B
FDDI dual-attachment MIC connections
IN
BYPASS
PORTA
PORTB
FDDI MODULE MMF
STATUS
IN
BYPASS
RING OP THRU
WRAP A WRAP B
A
B
FDDI dual-attachment ST connections
PORTA
PORTB