SBFTF10xx-12x
Operation
Status LEDs
Use the status LEDs next to the fiber ports to monitor the media converter and the fiber network connections.
PWR | | The “FD” and “LACT” LEDs near the bottom of the media |
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LACT | | converter refer to Fiber Port 1 (F1). |
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FD 
10
F(ull) D(uplex)
On = Full-duplex connection.
Off = Half-duplex connection.
L(ink) ACT(ivity)
On = Fiber link connection.
Flashing = Fiber network activity.
P(o)W(e)R
On = Connection to external AC or DC power.
Use the bi-color twisted-pair status LEDs to monitor the twisted-pair copper network connections.
Duplex/Link LED | Duplex/Link Speed |
Amber = A link on the half-duplex twisted-pair | | | | | | | | |
copper link. | | | | | | | | |
| | | | | | | |
Flashing Amber = Activity on the half-duplex | | | | | | | | |
| | | | | | | |
copper link. | | | | | | | | |
Green = A link on the full-duplex twisted-pair | | | | | | | | |
copper link. | | | | | | | | |
| | | | | | | |
Flashing Green = Activity on the full-duplex | | 10/100TX |
copper link. | | | | | | | | |
Speed LED | | | | | | | | |
Amber = 10Mb/s operation. | | | | | | | | |
Green = 100Mb/s operation. | | | | | | | | |
Operation -- Continued
Product Features
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 SBFTF10xx-12x models.
The 512-Bit Rule does not apply in a full-duplex network.
Half-Duplex Network (512-Bit Rule)
In a half-duplex network, the maximum cable lengths are determined by the round trip delay limitations of each fast Ethernet collision domain. (A collision domain is the longest path between any two terminal devices, e.g. a terminal, switch, or router.)
The 512-Bit Rule determines the maximum length of cable permitted by calculating the round-trip delay in bit-times (BT) of a particular collision domain. If the result is less than or equal to 512 BT, the path is good.
For more information on the 512-Bit Rule, see the white paper titled “Collision Domains” on the Transition Networks website at: www.transition.com.
Distance Extension
The SBFTF10xx-12x 6-point bridging media converter segments up to five (5) 10Base-T copper Ethernet and/or 100Base-TX copper fast Ethernet and one
(1) 100Base-FX fiber fast Ethernet collision domains.
In a half-duplexEthernet or fast Ethernet environment, the SBFTF10xx-12x media converter extends network distances by segmenting collision domains so that the 512-Bit Rule applies separately to each collision domain (see page 9).
In a full-duplexEthernet or fast Ethernet environment, the SBFTF10xx-12x media converter extends network distances to the physical cable limitations imposed by the selected twisted-pair copper fiber cables (see pages 1 and 2).
