Transition Networks SBFTF10xx-1xx User manual

33404 Rev. G https://www.transition.com Page 1 of 18
User Guide
SBFTF10xx-1xx
Stand-Alone Media Converters
•Copper to Fiber
•10/100 Bridging (2 Ports)
•10/100Base-TX to 100Base-FX
•Auto-Negotiation
•Auto-MDI/MDIX
•Link Pass Through
•Far-End-Fault (FEF) Detection
•Automatic Link Restoration Extend network distance up to 120km
•Bridging devices will provide conversion and integration solutions for half and full-duplex environments
•10 Mbps or 100 Mbps on TP port
•Half or full-duplex on all ports including fiber
Contents
Introduction .................................................................................................................................................. 1
Ordering Information.................................................................................................................................... 2
Optional Accessories (sold separately) ......................................................................................................... 2
Installation .................................................................................................................................................... 3
Set the 6-position DIP Switch ................................................................................................................... 3
Connect the Twisted-Pair Copper Cable................................................................................................... 4
Connect the Fiber Cable ........................................................................................................................... 5
Power the Media Converter ..................................................................................................................... 5
Product Features ...................................................................................................................................... 6
Operation...................................................................................................................................................... 8
Status LEDs ............................................................................................................................................... 8
Half-Duplex Network ................................................................................................................................ 9
Cable Specifications................................................................................................................................12
Technical Specifications ..............................................................................................................................14
Troubleshooting..........................................................................................................................................15
Contact Us................................................................................................................................................... 16
Compliance Information .............................................................................................................................17
Declaration of Conformity ......................................................................................................................17
CE Mark................................................................................................................................................... 17
Record of Revisions..................................................................................................................................... 18
Introduction
Transition Networks SBFTF10xx-10x 2-port Ethernet/Fast Ethernet bridging media converter connects
10Base-T Ethernet or 100Base-TX Fast Ethernet twisted-pair copper network devices to network devices
on a 100Base-FX Fast Ethernet fiber network.
The SBFTF10xx-105 provides an interface between 10/100Base-TX ports and 100Base-FX ports, allowing
users to integrate fiber optic cabling into 10/100Base-TX copper environments. Operating at Layer 2,
this converter not only converts copper to fiber, but it also does Rate Conversion, converting 10/100
copper to 100Base fiber.

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Ordering Information
SKU
Description
SBFTF1011-105
10/100Base-TX (RJ-45) [100 m/328 ft.] to 100Base-FX 1300nm multimode (ST)
[2 km/1.2 mi.] Link Budget: 11.0 dB
SBFTF1013-105
10/100Base-TX (RJ-45) [100 m/328 ft.] to 100Base-FX 1300nm multimode (SC)
[2 km/1.2 mi.] Link Budget: 11.0 dB
SBFTF1014-105
10/100Base-TX (RJ-45) [100 m/328 ft.] to 100Base-FX 1310nm single mode (SC)
[20 km/12.4 mi.] Link Budget: 16.0 dB
SBFTF1019-105
10/100Base-TX (RJ-45) [100 m/328 ft.] to 100Base-FX 1310nm single mode (LC)
[20 km/12.4 mi.] Link Budget: 17.3 dB
SBFTF1029-105
10/100Base-TX (RJ-45) [100 m/328 ft.] to 100Base-FX 1310nm TX/1550nm RX
single fiber single mode (SC) [20 km/12.4 mi.]. Link Budget: 19.0 dB
SBFTF1029-106
10/100Base-TX (RJ-45) [100 m/328 ft.]to 100Base-FX 1550nm TX/1310nm RX
single fiber single mode (SC) [20 km/12.4 mi.]. Link Budget: 19.0 dB
SBFTF1039-105
10/100Base-TX (RJ-45) 100 m/328 ft.] to 100Base-FX 1300nm multimode (LC)
[2 km/1.2 mi.] Link Budget: 11.0 dB
SBFTF1040-105
10/100Base-TX (RJ-45) [100 m/328 ft.] to 100Base-X SFP Slot (empty)
*Typical maximum cable distance. Actual distance is dependent upon the physical characteristics of the
network installation.
**SBFTF1029-105/106 pair or -107/108 pair should be installed in the same network where one is the
local coverter and the other is the remote converter.
Power Supply Included. To order the corresponding country-specific power supply, add the extension
from the following list to the end of the SKU; -NA = North America, -LA = Latin America, -EU = Europe, -
UK = United Kingdom, -SA = South Africa, -JP = Japan, -OZ = Australia, -BR = Brazil.
Optional Accessories (sold separately)
SKU
Description
SPS-2460-SA
Stand-Alone Power Supply
SPS-2460-PS
Piggy-Back Power Supply
E-MCR-05
12-Slot Media Converter Rack with universal internal power supply 17 x 15 x 5 in.
RMS19-SA4-01
4-slot Media Converter Shelf
WMBL
Optional Wall Mount Brackets; Length: 4.7in. (119mm)
WMBV
Optional Vertical Mount Bracket; Length: 5.0 in. (127 mm)
WMBD
Optional DIN Rail Mount Bracket; Length: 5.0 in. (127 mm)
WMBD-F
Optional DIN Rail Mount Bracket (flat); Length: 3.3in. (84 mm)
SFP Modules
See the Transition Networks SFP webpage.

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Installation
CAUTION: Wear a grounding device and observe electrostatic discharge
precautions when setting the 6-position DIP switch. Failure to observe this
caution could result in damage to the media converter.
Set the 6-position DIP Switch
The 6-position switch is located located on the side of the media converter. Use a small flat blade
screwdriver to set the recessed switches. See below for the locations of the individual switches.
1. TP Auto-Negotiation
up Enables Auto-Negotiation on the copper port
down Disables Auto-Negotiation on the copper port. Forces the setting of switches 2 and 3
2. TP Duplex
(Only functions with switch 1 down)
up Full duplex operation on the copper port
down Falf duplex operation on the copper port
(Parallel detection only with Auto-Negotiation enabled and linked to nonnegotiating device)
up Parallel detects in IEEE standard half duplex
down Non-standard full duplex
3. TP Speed
(Only functions with switch 1 Down)
up 100 Mb/s operation on the copper port
down 10 Mb/s operation on the copper port
4. Fiber Mode
up Forces full duplex operation on the fiber port
down Forces half duplex operation on the fiber port
5. Link Pass Through (LPT)
up Enabled
down Disabled
6. Far-End Fault (FEF)
up Enabled
down Disabled

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Connect the Twisted-Pair Copper Cable
Ensure that the correct cable type is installed to support the highest speed and mode of operation to be
selected.
Although Category 3 cable is adequate for the 10Base-T installation, Category 5 cable is strongly
recommended, since Category 3 cable can not be used for 100Base-TX installation.
10Base-T / Ethernet Collision Domain
•If half-duplex cable is used, refer to the 5-Segment Rule before installing the 10Base-T twisted-
pair copper cable.
•If full-duplex cable is used, the 5-Segment Rule does not apply. The cable lengths are
constrained by the cable requirements.
100Base-TX / Fast Ethernet Collision Domain
•If half-duplex cable is used, refer to the 512-Bit Rule before installing the 100Base-TX twisted-
pair copper cable.
•If full-duplex cable is used, the 512-Bit Rule does not apply. The cable lengths are constrained by
the cable requirements.
Note: A Fast Ethernet collision domain can have one class 1 repeater or two class 2 repeaters.
Install the Twisted-Pair Copper Cable
Note: The AutoCross feature allows either MDI (straight-through) or MDI-X (crossover) cable
connections to be configured automatically, according to the network conditions.
1. Locate or build IEEE 803.2 compliant 10Base-T or 100Base-TX cable, with RJ-45 connectors
installed at both ends.
2. Connect the RJ-45 connector at one end of the cable to the RJ-45 port on the SBFTF10xx-10x
media converter.
3. Connect the RJ-45 connector at the other end of the cable to the RJ-45 port on the other device
(switch, workstation, etc.).

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Connect the Fiber Cable
100Base-FX / Fast Ethernet Collision Domain
•If half-duplex mode is used, refer to the 512-Bit Rule before installing the 100Base-FX fiber
cable.
•If full-duplex mode is used, the 512-Bit Rule does not apply. The cable lengths are constrained
by the cable requirements.
Install the Fiber Cable
1. Locate an IEEE 803.2 compliant 100Base-FX fiber cable with male, two-stranded TX to RX
connectors installed at both ends.
2. Connect the fiber cables to the SBFTF10xx-10x as described:
•Connect the male TX cable connector to the female TX port.
•Connect the male RX cable connector to the female RX port.
3. Connect the fiber cables to the other device (another media converter, hub, etc.) as described:
•Connect the male TX cable connector to the female RX port.
•Connect the male RX cable connector to the female TX port.
Power the Media Converter
Note: The external power supply provided with this product is UL listed by its manufacturer.
AC
1. Connect the barrel connector on the power adapter to the media converter’s power port (located
on the back of the media converter).
2. Connect the power adapter plug to AC power.
3. Verify that the media converter is powered by observing the Pwr LED is lit.
DC
See the Transition Networks external power supply user guide for powering the media converter.

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Product Features
Rate Conversion
The media converter allows connection of 10Mb/s terminal devices on a 10Base-T legacy Ethernet
copper network to 100Mb/s terminal devices on a 100Base-TX Fast Ethernet copper network and/or to
100Mb/s terminal devices on a 100Base-FX Fast Ethernet fiber network.
Auto-Negotiation
The Auto-Negotiation feature allows the SBFTF10xx-10x media converter to automatically configure
itself to achieve the best possible mode of operation over a link. The media converter broadcasts its
speed (10 Mb/s or 100 Mb/s) 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.
In a scenario where the media converter is linked to a non-negotiating device, 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.: 10 Mb/s, half-duplex). Disabling this feature lets you force
the connection to the desired speed and duplex mode of operation.
AutoCross
When the AutoCross feature is activated, it allows either straight-through (MDI) or crossover (MDI-X)
copper cables to be used when connecting to 10Base-T or 100Base-TX devices. AutoCross determines
the characteristics of the connection and automatically configures the unit to link up, regardless if the
copper cable is MDI or MDI-X configuration.
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.
Far-end Fault
When a fault occurs on an incoming fiber link (1), the media converter transmits a Far-End Fault signal
on the outgoing fiber link (2). In addition, the Far-End Fault signal also activates Link Pass-Through,
which, in turn, disables the link on the copper portion of the network (3) and (4).

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Distance Extension
The SBFTF10xx-10x media converter segments 10Base-T copper Ethernet and/or 100Base-TX copper
Fast Ethernet and 100Base-FX fiber Fast Ethernet collision domains.
In a half-duplex Ethernet or Fast Ethernet environment, the SBFTF10xx-10x media converter extends
network distances by segmenting collision domains so that the 5-Segment Rule or the 512-Bit Rule
applies separately to each collision domain.
In a full-duplex Ethernet or Fast Ethernet environment, the SBFTF10xx-10x media converter extends
network distances to the physical cable limitations imposed by the selected copper and fiber cables.
Automatic Link Restoration
This feature will restore the dropped link automatically, upon correcting the fault condition.
Congestion Reduction
The SBFTF10xx-10x media converter does not forward collision signals or error packets from one
collision domain to another, improving baseline network performance. In addition, the media converter
filters packets destined for local devices, also reducing network congestion.

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Operation
Status LEDs
Use the status LEDs to monitor the SGETF10xx-1xx media converter operation in the network.
LED
Description
Pwr
Power
ON = Power applied
OFF = Not powered
Fiber LEDs
LNK ACT
Link/Activity
ON Solid = Link established
FLashing = RX Data
FD
(Duplex)
ON = Full Duplex
OFF = Half Duplex
Copper LEDs
LNK ACT
Link/Activity
ON Solid = Link established
FLashing = RX Data
CD
(Duplex)
ON = Full Duplex
OFF = Half Duplex
100
(Speed)
ON = 100 Mbs
OFF = 10 Mbx

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Half-Duplex Network
512-Bit Rule – 100Base-TX or 100Base-FX
Use the 512-Bit Rule to calculate the 100Base-TX or 100Base-FX half-duplex collision domain.
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. Note: The 512-Bit Rule applies separately to each collision domain.
To calculate the round-trip delay for a collision domain:
1. Find the collision domain, i.e., the longest path between any two terminal devices (e.g., terminal,
switch, and/or router).
2. Calculate the round-trip delay in bit-times for each length of cable.
3. Determine the bit-time values for each device (see below).
Class I hub 140 BT
Class II hub 92 BT
Terminal/router 50 BT
1 meter TP cable 1.11 BT
1 meter fiber cable 1 BT
Fast Ethernet switch 50 BT
SBFTF10xx-10x 50 BT
4. Add the bit-time values for each length of cable and the bit-times for each device.
100Base-TX twisted-pair example
In the example below, the SBFTF10xx-10x 2-Port bridging media converter acts as a switch. In this case,
the collision domain bound by the media converter on one end and a terminal on the other end.
Since the total of the bit-times in this example is less than 512 (see table below), the path is good.
Sum of the bit-times for the example collision domain:
Media converter = 50.0 BT
100 m TP cable (100m x 1.11 BT/m) = 111.0 BT
Two Class II hubs (2 x 92) = 184.0 BT
Two 10 m TP cables (2 x 10m x 1.11 BT/m) = 22.2 BT
Terminal = 50.0 BT
Total = 417.2 BT

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100Base-TX fiber Example
The drawing below illustrates a collision domain where two media converters are connected via fiber
cable.
Since the total of the bit-times in this example is less than 512 (50BT + 400BT + 50BT = 500BT) the path
is good.
5-Segment Rule – 10Base-T
Use the 5-Segment Rule to calculate the 10Base-T half-duplex collision domain. The 5-Segment
Rule states that a transmission path of a collision domain can consist of not more than 5 segments.
A “collision domain” and a “segment” are defined as follows:
A collision domain is the longest path in a 10Base-T network between any two terminal devices, e.g.,
a terminal, switch, or router. The SBFTF10xx-10x media converter is also a terminal device.
A segment is a cable connection between any two network interfaces within a collision domain.