Cabling Fddi Modules - 3Com CoreBuilder 3500 Getting Started Manual

42 C 4: C
HAPTER ABLING
Figure 19 Connecting Using a Conditioned Launch Cable
MODEM
INS
C
1000BASE
GBIC module
1000 BASE (GBIC)
3C35330
PWR
INS
ERR
To network
cable
A
A
Repeat steps 1 through 6 for additional 1000BASE
7
GBIC modules.
ETHERNET
TERMINAL
10BT
L
E
T
RX TX
SC connector
B
A
Offset
= Multimode fiber
A
= Single-mode fiber
B

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.