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42 C
HAPTER
4: C
ABLING
Figure 19
Connecting Using a Conditioned Launch Cable
7
Repeat steps 1 through 6 for additional 1000BASE
GBIC modules.
Cabling FDDI Modules
Your network’s FDDI segments connect to the
CoreBuilder 3500 system through FDDI modules,
which come in two versions:
■
FDDI MMF
— Connects to multimode fiber-optic
cable
■
FDDI SMF
— Connects to single-mode fiber-optic
cable
Both modules contain six FDDI ports that use duplex
SC fiber-optic connectors. You can configure the FDDI
ports to support either of these modes:
■
Single-attached station (SAS) mode
— Using a
single port, this connection allows you to attach
the module to one of the dual counter-rotating
FDDI rings. In most cases, the SAS station connects
to the primary ring, as the secondary ring is on
standby in case the primary fails. A single FDDI
module supports up to six SAS connections. See
“Cabling a Single-Attached Station” on page 43
to configure this type of connection.
■
Dual-attached station (DAS) mode
— Using
two FDDI ports, this connection allows you to
attach the module to both of the dual,
counter-rotating FDDI rings. This configuration
provides high fault tolerance. A single FDDI
module supports up to three DAS connections. See
“Cabling a Dual-Attached Station” on page 44 to
configure this type of connection.
= Multimode fiber
= Single-mode fiber
A
B
C
1000 BASE (GBIC)
3C35330
PWR
INS
ERR
L
E
T
INS
MODEM
TERMINAL
ETHERNET
10BT
1000BASE
GBIC module
RX
A
B
A
A
TX
Offset
To network
cable
SC connector