8
CGFEB10xx-12x
24-Hour Technical Support: 1-800-260-1312 -- International: 00-1-952-941-7600
Operation
Status LEDs
Use the status LEDs to monitor the media converter operation in the network.
Fiber status LEDs
The status LEDs for the 1000Base-SX/LX fiber connection
(labeled LACT and
PWR)
are located next to the fiber port
(Port 2)
.
PWR:
Power
ON = Connection to chassis
power.
LACT:
Link activity
ON = A link has been
established for the fiber
connection.
Flashing = The fiber
connection is
transmitting or receiving data.
Copper status LEDs
The status LEDs for the copper connection are integrated into the RJ-45 port. These
LEDs are not labeled on the media converter. See text and drawing below.
Duplex/Link:
Orange
A link in half-duplex mode has been established for
the copper connection.
Flashing Orange
The copper connection is transmitting/receiving data
in half-duplex mode.
Green
A link in full-duplex mode has been established for
the copper connection.
Flashing Green
The copper connection is transmitting/receiving data
in full-duplex mode.
Note:
Speed LED:
There are two possible LED states associated 100 Mb/s operation:
•
On some units at 100 Mb/s, the speed LED will remain OFF.
•
On others units at 100 Mb/s, the speed LED will turn ON orange.
OFF
10 Mb/s or 100 Mb/s
operation.
Orange
100 Mb/s operation
(only)
Green
1000 Mb/s operation
(only)
10/100/1000Base-T
Duplex/Link
Speed
LACT PWR
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9
CGFEB10xx-12x
Operation—continued
Product features
Auto-Negotiation
The Auto-Negotiation feature allows the CGFEB10xx-12x media converter to
automatically configure itself to achieve the best possible mode of operation over a
link. The media converter broadcasts its speed
(10 Mbps, 100 Mbps, or 1000 Mbps)
and duplex capabilities
(full or half)
to the other devices and negotiates the best
mode of operation. Auto-Negotiation allows quick and easy installation because the
optimal link is established automatically. No user intervention is required to
determine the best mode of operation.
A scenario where the media converter is linked to a non-negotiating device is a case
where the user may want to disable Auto-Negotiation. In this instance, the mode of
operation will drop to the least common denominator between the two devices
(e.g.
100 Mb/s, half-duplex)
. Disabling this feature gives the user the ability to force the
connection to the best mode of operation.
Note
: The CGFEB10xx-12x and SGFEB10xx-12x also support 1000 Mbps fiber
Auto-Negotiation.
Link Pass-Through
The Link Pass-Through feature allows the media converter to monitor both the fiber
and copper RX
(receive)
ports for loss of signal. In the event of a loss of an RX
signal (1), the media converter will automatically disable the TX
(transmit)
signal
(2), thus, “passing through” the link loss (3). The far-end device is automatically
notified of the link loss (4), which prevents the loss of valuable data unknowingly
transmitted over an invalid link.
Full-Duplex Network
In a full-duplex network, maximum cable lengths are determined by the type of
cables that are used. See pages 1 and 2 for the cable specifications for the different
CGFEB1xxx-1xx models.
The 512-Bit Rule does not apply in a full-duplex network.
4
1
Media
Converter A
Media
Converter B
Near-End
Device
Far-End
Device
original fault
on the co pper link
media con verter B
disables the co pper lin k
media con verter A
disables the fiber TX
link
3
2
media con verter B
loses the fiber RX link
