25
BLACK BOX
®
White
with
5th black
diamond
[email protected] | www.blackbox.co.uk
Media Converters
Standalone
10Mbps
AutoCross Media Converters
Why worry about the UTP port? Let ‘‘the Box’’ figure it out!
• Seamless copper-to-fibre conversion
for Ethernet or Fast Ethernet.
• Easy plug-and-play operation.
• Reconfigure themselves for proper UTP
cabling — no more crossover cables!
• Support for half- and full-duplex operation.
• Uplink/downlink fault detection
is provided by LinkAlert
™
!
•
WARRANTY
— Lifetime
LE2122A-R4
Connectors
—
LE2122A-R4, LH2001A-ST-R3:
(1) RJ-45, (1) pair of ST;
LE2122A-SM-R4, LH2001A-SC-R3,
LH2001A-SCSM-R3:
(1) RJ-45, (1) pair of SC
Indicators
— LEDs: (1) Power; (1) Link Status
and (1) Activity (per each twisted-pair
and fibre port)
Power
— 110–240 VAC, 50–60 Hz, external
autosensing power supply
Dimensions
— 2.5(H) x 7.6(W) x 10.2(D) cm
Weight
— 0.2 kg
t E c h s p E c s
Autosensing
port
configuration!
Item
Code
Price
AutoCross Media Converters
10BASE-T to Duplex 10BASE-FL
Multimode
ST
LE2122A-R4
£266.05
Single-Mode
SC
LE2122A-SM-R4
£498.90
100BASE-TX to Duplex 100BASE-FX
Multimode
ST
LH2001A-ST-R3
£601.31
Multimode
SC
LH2001A-SC-R3
£601.31
Single-Mode
SC
LH2001A-SCSM-R3
£1,336.73
Black Box Explains
Autocross conversion.
When using media converters with 10BASE-T or 100BASE-TX cable, you may need to
connect your converter to a non-hub device such as a PC or printer, which requires a
specially pinned crossover cable for a connection. A media converter with autocross
enables you to use an ordinary straight-pinned 10BASE-T patch cable in place of the
crossover cable — a manual or automatic switch on the converter makes the crossover
connection for you.
Autocross conversion eliminates the need to crosspin cables and set an uplink switch.
It adapts to the pin assignment of the twisted-pair cable whether it’s crossed or
uncrossed.
LH2001A-ST-R3
Connect Ethernet or Fast Ethernet
segments to fibre segments without using
crossover cables. With BLACK BOX
®
AutoCross Media Converters, you no longer
have to deal with mismatched transmit and
receive cable pairs.
These converters contain a switch that
senses the type of circuit connected to the
UTP port and auto matically configures the
port to match. Because the UTP side is
autosensing to MDI/MDI-X, you can use
either a straight or crossed cable to connect
a switch or NIC.
The converters feature LinkAlert to
monitor for uplink and downlink failures,
and alert the network if transmission fails.
Use AutoCross Media Converters up to 100
metres on the UTP link, up to 2 kilometres on
a multimode fibre link, and up to 20
kilometres on a single-mode fibre link.
10BASE-T versions of the AutoCross
Media converter are not compatible with
autosensing devices (for example, a 10-/100-
Mbps switch); they only work with standard
10-Mbps devices.
Single-mode or multimode?
There are two basic types of fibre: multimode and single-
mode. both types consist of two basic components: the core and
the cladding, which trap the light in the core. typical multimode
fibre core diameters are 50, 62.5 and 100 microns. single-mode
fibre has a much smaller core, typically 5 to 10 microns.
In multimode fibre, multiple photons (or modes of light) travel
down the fibre core. However, in long cable runs (greater than
914.4 metres), multiple paths of light can cause signal distortion at
the receiving end, resulting in an unclear and incomplete data
transmission.
In single-mode fibre, the reduced core size allows only a single
photon (or one light mode) to travel down the core. Single-mode
fibre gives you a higher transmission rate and up to 50 times more
distance than multimode, but also costs more. The small core and
its single lightwave virtually eliminate any distortion that could
result from overlapping light pulses, providing the least signal
attenuation and highest transmission speeds of any fibre cable
type.
Which fibre to use.
• OM1 (62.5/125 μm)
— This fibre is now used only used for
small networks with no plans for expansion or no data rates
higher than Gigabit Ethernet.
• OM2 (50/125 μm)
— This is now the most popular fibre for
networking as it carries much higher bandwidth and can use
inexpensive LED transmission systems for running applications up
to 622 Mbps (the output is unreadable at faster data rates) as well
as VCSEL for short wavelength (850 nm).
• OM3 (50/125 μm)
— This is the pinnacle of multimode fibre as
it carries the highest bandwidth at longer lengths than any other
multimode fibre. It's ideal for applications where future network
expansion is anticipated. The minor price difference compared
with other fibre could be offset by a greater financial savings and
fewer network disruptions in the future.
• OS1 (9/125 μm)
— This fibre is only used in networking in
campus/interbuilding backbone applications for distances greater
than 550 metres.
Black Box Explains
Guidelines for choosing and testing fibre optic cable.