3com 2500 Quick Setup Guide
Ethernet Modules
4-11
Cabling the 10BASE-FL Module
The 10BASE-FL module contains eight 10BASE-FL
ports that use ST connectors to provide Ethernet
connections over fiber. To each port, you can attach
an Ethernet/IEEE 802.3 segment that is up to 2Km
long. As a result, Ethernet segments dispersed
throughout a building or campus can be centrally
connected to one CoreBuilder system.
ports that use ST connectors to provide Ethernet
connections over fiber. To each port, you can attach
an Ethernet/IEEE 802.3 segment that is up to 2Km
long. As a result, Ethernet segments dispersed
throughout a building or campus can be centrally
connected to one CoreBuilder system.
Each pair of ST connectors comprises a fiber optic
transmitter and a receiver attached to a duplex
fiber cable. The transmitter for port one (1) is
adjacent to the receiver for port one (1), and so on.
You can attach to the transmitter and receiver of
the individual ports either 50/125
transmitter and a receiver attached to a duplex
fiber cable. The transmitter for port one (1) is
adjacent to the receiver for port one (1), and so on.
You can attach to the transmitter and receiver of
the individual ports either 50/125
mm or 62.5/125
mm fiber optic cable, terminated with ST connectors.
If you terminate the cable with any other
connectors, use an adapter cable between the
module’s port and the cable plant termination.
If you terminate the cable with any other
connectors, use an adapter cable between the
module’s port and the cable plant termination.
The 10BASE-FL standard is backward-compatible
with the earlier Fiber Optic Inter-Repeater Link
(FOIRL) method for transmitting Ethernet over fiber.
with the earlier Fiber Optic Inter-Repeater Link
(FOIRL) method for transmitting Ethernet over fiber.
Any transceiver that attaches to a port through the
fiber also has a fiber transmitter and fiber receiver.
When cabling a transceiver:
fiber also has a fiber transmitter and fiber receiver.
When cabling a transceiver:
■
Insert the module port’s transmitter into the fiber
that is connected to the receiver of the
corresponding transceiver.
that is connected to the receiver of the
corresponding transceiver.
■
Attach the module port’s receiver to the fiber into
which the transmitter of the transceiver is
inserted.
which the transmitter of the transceiver is
inserted.
Because the 10BASE-FL standard is
backward-compatible with the earlier Fiber Optic
Inter-Repeater Link (FOIRL) method for transmitting
Ethernet over fiber, you may attach a transceiver
that is FOIRL-compatible to the 10BASE-FL port and
it will function the same as a transceiver that is
compatible with 10BASE-FL.
backward-compatible with the earlier Fiber Optic
Inter-Repeater Link (FOIRL) method for transmitting
Ethernet over fiber, you may attach a transceiver
that is FOIRL-compatible to the 10BASE-FL port and
it will function the same as a transceiver that is
compatible with 10BASE-FL.
When attaching fiber to a transceiver that is far
away from the CoreBuilder system, you can identify
which fiber is connected to the transmitter of the
module’s port by holding the end of the cable
against a sheet of white paper. When the
CoreBuilder system is on, the fiber connected to
the module’s port transmitter emits a red light.
away from the CoreBuilder system, you can identify
which fiber is connected to the transmitter of the
module’s port by holding the end of the cable
against a sheet of white paper. When the
CoreBuilder system is on, the fiber connected to
the module’s port transmitter emits a red light.