© 2007. All rights reserved. Black Box Corporation.
10-/100-/1000-Mbps Autosensing Gigabit Miniature Media Converters
FREE 24-hour Tech Support: 724-746-5500 blackbox.com
2/27/2007
#26525
FEATURES
• Media and data rate conversion in one convenient device.
• Automatically adapts to speed:
10, 100, or 1000 Mbps.
• No need to use crossover cable — auto MDI-II/MDI-X detects and adapts to pinning.
• Run fiber cable distances up to
43.4 miles (69.8 km)!
• Multimode and single-mode duplex and single-mode single-strand models available.
Link 10-/100-/1000-Mbps PCs up to 10 kilometers away from a managed
10/100/1000 Ethernet switch via duplex, single-mode fiber optic cable.
16-Port 10/100/1000 Managed
Ethernet Switch (LGB2002A)
10-/100-/1000-Mbps Autosensing Gigabit
Miniature Media Converter (LGC121A)
CAT5e cable
Duplex single-mode fiber optic cable, up to 10 km
10-/100-/1000-Mbps Autosensing Gigabit
Miniature Media Converter (LGC121A)
CAT5e cable
PCs with 10-/100-/
1000-Mbps copper
Ethernet ports
CAT5e cable CAT5e cable
10-/100-/1000-Mbps Autosensing Gigabit
Miniature Media Converter (LGC121A)
10-/100-/1000-Mbps Autosensing Gigabit
Miniature Media Converter (LGC121A)
OVERVIEW
Media converters help you make the most of your Ethernet,
Fast Ethernet, or Gigabit Ethernet network. The converters support long distances between Ethernet devices over fiber optic cable. They also work as data rate converters.
10-/100-/1000-Mbps Autosensing Gigabit Miniature Media
Converters connect Ethernet, Fast Ethernet, or Gigabit Ethernet copper cable to fiber optic cable.
On the twisted-pair side, the converters autosense and match the connected device’s speed—10, 100, or 1000 Mbps.
They also detect and adapt to the RJ-45 connector’s pinning
(crossed or uncrossed), so you won’t need crossover cable.
On the fiber side, speeds typically reach 1000 Mbps. Choose
50-/125-µm or 62.5/125-µm duplex multimode fiber cable or
9-/125-µm duplex or single-strand single-mode fiber cable.
All models include one RJ-45 connector for the twisted-pair connection. Multimode and single-mode duplex fiber cable models have two SC connectors, while single-mode singlestrand fiber cable models have one SC connector. Distances range from up to 984.2 feet to 43.4 miles (300 m to 69.8 km), depending on the converter model.
The converters work in pairs: choose one pair of duplex converters (LGC120A for 984.2 feet [300 m], LGC121A for
6.2 miles [10 km], LGC122A for 24.8 miles [39.9 km], or
LGC124A for 43.4 miles [69.8 km]). Or, select one complementary pair of single-strand converters (LGC125A and LGC126A or
LGC127A and LGC128A). Single-strand converters come in
1310-nm TX/1550-nm RX models for 6.2 or 24.8 miles (10 or
39.9 km) and 1550-nm TX/1310-nm RX models for 6.2 or
24.8 miles (10 or 39.9 km).
If you use only one converter at each end of the link, power it through the external 100–240-VAC power supply
(included). Or, select the USB Power Adapter Cable (LHC021A) to power the converter via your computer’s USB port.
If you use multiple converters, order the 18-Slot Power
Tray (LHC018A-AC or LHC018A-DC). The AC model features a 100–240-VAC power supply; the DC model uses a
-48-VDC power supply.
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2/27/2007
#26525
LGC120A
TECH SPECS
Cable Requirements —
Twisted-pair: CAT5 or above, shielded or unshielded;
Multimode fiber: 50-/125-µm or 62.5/125-µm duplex;
Single-mode fiber: 9-/125-µm duplex or single-strand
Maximum Distance — LGC120A: 984.2 ft. (300 m);
LGC121A, LGC125A–LGC126A: 6.2 mi. (10 km);
LGC122A, LGC127A–LGC128A: 24.8 mi. (39.9 km);
LGC124A: 43.4 mi. (69.8 km)
Speed — 10/100/1000 Mbps autosensing
Connectors — LGC120A–LGC122A, LGC124A: (1) RJ-45 with autocross for MDI-II/MDI-X, (2) SC;
LGC125A–LGC128A: (1) RJ-45 with autocross for MDI-II/MDI-X, (1) SC
Indicators — (2) LEDs: (1) TX Link/Act, (1) FX Link/Act
Power —
From the included external 100–240-VAC, 50–60-Hz adapter;
Via USB Power Adapter Cable (LHC021A) connected to a computer’s
USB port;
From the Power Tray with a 100–240-VAC, 50–60-Hz (LHC018A-AC) or -48-VDC (LHC018A-DC) power supply
Size — LGC120A–LGC122A, LGC124A–LGC128A: 0.8"H x 1.8"W x 3.4"D
(2 x 4.6 x 8.6 cm);
LHC018A-AC, LHC018A-DC: 2.3"H x 16.9"W x 9.2"D
(5.8 x 42.9 x 23.4 cm)
Technically Speaking
How autocross conversion can work for you.
When using media converters with 10BASE-T, 100BASE-TX, or 1000BASE-TX cable, you may need to connect your converter to a non-hub device such as a PC or printer.
According to IEEE 802.3 Ethernet standards, media converters originally needed a specially pinned crossover cable to connect to PCs. The crossover cable matches the devices’ transmit and receive pins. Now there are media converters that use normally-pinned 10BASE-T patch cable but incorporate an uplink or crossover connection—a switch on the converter that’s set to support the PC-to-converter connection. By setting the uplink switch to “cross,“ the converter’s internal mechanism crosses the pins on the
RJ-45 connector to simulate a crossover cable.
Autocross conversion eliminates both the need to crosspin cables and set an uplink switch. It adapts to the pin assignment of the twisted-pair cable whether crossed or uncrossed. And because it senses the pin configuration of any cable pinned to Ethernet specifications, it automatically adjusts without user configuration.
Item Code
10-/100-/1000-Mbps Autosensing Gigabit Miniature
Media Converters
10-/100-/1000-Mbps Copper to 1000-Mbps Duplex Fiber
(Must be used in pairs.)
Multimode 850-nm, 300 m, SC
Single-Mode, 1310-nm
10 km, SC
40 km, SC
Single-Mode, 1550-nm
LGC120A
LGC121A
LGC122A
70 km, SC LGC124A
10-/100-/1000-Mbps Copper to 1000-Mbps Single-Strand Fiber
(Must be used in complementary pairs.)
Single-Mode 1310-nm TX/1550-nm RX,
10 km, SC LGC125A
Single-Mode 1550-nm TX/1310-nm RX,
10 km, SC
Single-Mode 1310-nm TX/1550-nm RX,
40 km, SC
LGC126A
LGC127A
Single-Mode 1550-nm TX/1310-nm RX,
40 km, SC LGC128A
To power a single converter via your computer’s USB port, order…
USB Power Adapter Cable LHC021A
To rackmount multiple Miniature Media Converters, order…
Power Tray, 18-Slot with AC Power with DC Power
You might also need to order cable…
LHC018A-AC
LHC018A-DC
GigaBase ® 350 CAT5e Patch Cable, 4-Pair,
Straight-Pinned, PVC EVNSL85
Ceramic Terminated Multimode Fiber Optic Cable,
ST–ST ® EFN110-STST
Single-Mode Duplex Fiber Optic Cable,
SC–SC EFN5010
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