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Cabling FDDI Modules 43
When module availability and connectivity is crucial,
you can connect your DAS-configured module to the
network using
dual homing
. For more information,
see the FDDI chapter in the
CoreBuilder 3500
Implementation Guide
.
For more information on configuring DAS and SAS
modes, see the
fddi stationMode modify
command
in the
Command Reference Guide
.
Cabling a Single-Attached Station
A module connected to your FDDI network as a
single-attached station (SAS) uses a single FDDI
interface (one of the six module ports) to connect to
one of the network rings. The module can then
receive and transmit signals over this single
connection. Use SAS connections where cost is
important and where existing wiring does not support
dual connections.
An FDDI port configured in SAS mode can connect to
another FDDI network device, such as a concentrator
or workstation, which in turn can connect to the dual
counter-rotating rings of the FDDI network.
FDDI defines two types of SAS ports: Master (M) ports
and Slave (S) ports. All SAS ports on your FDDI MMF
module are defined as Master ports. This is important
to know when determining which FDDI connection
policy you want to use.
For a complete list of FDDI connection policies, see
the FDDI chapter in the
CoreBuilder 3500
Implementation Guide
.
To cable the module as a single-attached station:
1 Read and follow the “Fiber and Laser Safety
Precautions” on page 35 for safe operation.
2 Configure the module ports that you are working
with to support SAS mode. See the
fddi stationMode
modify
command in the
Command Reference Guide
for more information.
3 Insert the network fiber-optic cable into the SAS port
(configured as a Master port) on the module, as
shown in Figure 20.
4 Connect the other end of the network cable to a SAS
port (configured as a Slave port) on the FDDI network
device to which you are connecting. This FDDI
network device may be any device with an available
S port, for example, a concentrator, a server, or a
workstation.
Each FDDI port consists of a transmit side and a
receive side. For each FDDI port-to-port connection,
verify that you cable the transmit side of one FDDI
port to the receive side of the FDDI port to which you
are connecting; and the receive side of one port to
the transmit side of the other.
When a module port is properly connected, the port’s
Link status (
L
) LED lights.
5 Repeat steps 1 through 4 for additional SAS
connections.