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  • Manual... 
  • RS-232 Surge Protector, DB25, 4-Wire Serial Manual
    Manual for SP141A (Version 1)
 

Black Box Explains...Insertion loss.

Insertion loss is a power loss that results from inserting a component into a previously continuous path or creating a splice in it. It is measured by the amount of... more/see it nowpower received before and after the insertion.

In copper cable, insertion loss measures electrical power lost from the beginning of the run to the end.

In fiber cable, insertion loss (also called optical loss) measures the amount of light lost from beginning to end. Light can be lost many ways: absorption, diffusion, scattering, dispersion, and more. It can also be from poor connections and splices in which the fibers don’t align properly.

Light loss is measured in decibels (dBs), which indicate relative power. A loss of 10 dB means a tenfold reduction in power.

Light strength can be measured with optical power meters, optical loss test sets, and other test sets that send a known light source through the fiber and measure its strength on the other end. collapse


Product Data Sheets (pdf)...DIN Rail Converter and Repeaters with Opto-Isolation


Black Box Explains...Digital Visual Interface (DVI) and other digital display interfaces.

There are three main types of digital video interfaces: P&D, DFP, and DVI. P&D (Plug & Display, also known as EVC), the earliest of these technologies, supports both digital and... more/see it nowanalog RGB connections and is now used primarily on projectors. DFP (Digital Flat-Panel Port) was the first digital-only connector on displays and graphics cards; it’s being phased out.

There are different types of DVI connectors: DVI-D, DVI-I, DVI-A, DFP, and EVC.

DVI-D is a digital-only connector. DVI-I supports both digital and analog RGB connections. Some manufacturers are offering the DVI-I connector type on their products instead of separate analog and digital connectors. DVI-A is used to carry an analog DVI signal to a VGA device, such as a display. DFP, like DVI-D, was an early digital-only connector used on some displays; it’s being phased out. EVC (also known as P&D) is similar to DVI-I only it’s slightly larger in size. It also handles digital and analog connections, and it’s used primarily on projectors.

All these standards are based on transition-minimized differential signaling (TMDS). In a typical single-line digital signal, voltage is raised to a high level and decreased to a low level to create transitions that convey data. TMDS uses a pair of signal wires to minimize the number of transitions needed to transfer data. When one wire goes to a high-voltage state, the other goes to a low-voltage state. This balance increases the data-transfer rate and improves accuracy. collapse


Product Data Sheets (pdf)...Short-Haul Modem FSK (SHM-FSK)

  • Pdf Drawing... 
  • GigaStation2 Wallplate (9-Port Dual-Gang, White)
    PDF Drawing for the WPT488
 
  • Quick Start Guide... 
  • 1-Port Hardened Serial Server QSG
    Quick Start Guide for the LES421A (Version 1)
 
  • Manual... 
  • Secure Site Manager, 16-Port
    Installation and User Guide (Jan-07)
 

  • Software... 
  • ServSwitch DVI/VGA Extender Software
    Software for the ACS253A-CT, ACS253A-MM, ACS253A-SM, ACS253A-U-MM-R2, and ACS253A-U-SM-R2
 
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