Black Box LBH240A-H-ST User Manual

®

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05/04/2010 

#26587

Altitude —  -200 to 50,000 ft. (-61 to 15,240 m)

Distance (Maximum) — Multimode models: 2 km (1.2 mi.);  

Single-mode SC models: 20 km (12.4 mi.);  

Single-mode LC models: 15 km (9.3 mi.);  

Single-mode, long-distance SC models: 40 km (24.8 mi.)

Enclosure — Steel

Humidity — 5–95%, noncondensing

Standards — IEEE 802.3, IEEE 802.3u, IEEE 802.1p/q

Temperature Rating — 

All models:  

 Storage: -40 to +185°F (-40 to +85°C);  

Standard models:  

 Operating: +32 to +104°F (0 to +40°C);  

Hardened models:  

  Long-term operating:  

   -13 to +140°F (-25 to +60°C);  

  Short-term operating:  

   -40 to +185°F (-40 to +85°C);  

 Cold start to -4°F (-20°C);  

Extreme models:  

  Long-term operating:  

   -40 to +167°F (-40 to +75°C);  

  Short-term operating:  

   -58 to +212°F (-50 to +100°C);  

 Cold start to -40°F (-40°C)

Indicators — LEDs:  

Per Unit: (2) Power;  

Per Port: (2) LK/ACT, 2) F/H;  

Per Copper Port: (2) 10/100

Size —

 3.6"H x 3"W x 1.7"D (9.1 x 7.6 x 4.3 cm)

Weight — Switches: 0.8 lb. (0.4 kg);  

Standard and Hardened Power Supplies: 0.4 lb. (0.2 kg);  

Extreme Power Supplies: 0.5 lb. (0.2 kg)

Run the distance!

Choose switches with fiber links for long-distance fiber links

through harsh environments.

Multimode models support up to 2 kilometers (1.2 miles) between

switches. For longer distances, choose single-mode models for up to
20 kilometers (12.4 miles) or single-mode, long-distance models for  
an incredible 40 kilometers(24.8 miles) between links.

Heavy-Duty Edge Switches

 can be daisychained together 

indefinitely, making them ideal for applications such as traffic signals 
where a great many switches are needed over a long distance.
Easy to set up

Heavy-Duty Edge Switches

 are literally plug-and-play. All  

copper ports are autosensing for speed and duplex, adjusting  
to the connected device automatically. Plus, the UTP ports feature 
Auto-MDI/MDI-X, eliminating the need for crossover cables.

Each switch has two full sets of LED indicators: one set on  

the front for viewing convenience when the switch is DIN rail or 
wallmounted, and one set mounted in the end next to the media 
ports for easy viewing when units are in a rackmount tray.

Heavy-Duty Edge Switches

 feature nonblocking switching 

architecture with a 2K MAC address table. The 128K buffer memory
makes it easy to inter connect 10-Mbps and 100-Mbps devices.
Fast, redundant backup

Heavy-Duty Edge Switches

feature Link-Loss-Learn (LLL) for fast

network recovery when using the switches in a redundant application. 
In a normal network situation where you have primary link and a 
backup link, the network can take up to a few minutes to recover 
after the primary link goes down. This is because, when the link 
breaks, the switch uses its old MAC address table to try to send data
to the disabled port.

However, if a link breaks with LLL in place, the switch senses the 

disconnect and instantly clears its MAC address table, forcing a new
address table that includes the new link.

LLL works on both copper and fiber ports and be enabled  

or disabled at will.
Use them nearly anywhere

Heavy-Duty Edge Switches

 can be used as standalone switches, 

wallmounted, or DIN-rail mounted with special brackets. You an also 
rackmount up to eight units in the optional Rackmount Tray.

The switches each have two full sets of LED indicators: 

one set on the front for viewing and one set mounted next to the 
media ports, so you get a clear view of the LEDs from any angle.
Don’t see it? Just ask.

If you require a port combination, power source, or mounting

option not listed, contact our FREE Tech Support.