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Black Box Explains... Buffers

A buffer (also called a spooler or a cache) is a temporary storage device used to share printers and compensate for a difference in speed and data flow between two... more/see it nowdevices. Buffers use RAM (Random-Access Memory) to take in data and hold it until the receiving device handles it.

A buffer serving a computer can be installed either internally or externally. Internal computer buffers are common in the forms of keyboard inputs, data caches, and video memory. An external buffer is usually used for printing.

An external buffer downloads jobs to the printer, freeing the computer so you can get back to work sooner.

A print buffer’s ports can be serial, parallel, or serial and parallel. Because a buffer’s ports operate independently of each other, a buffer also can be made to perform serial-to-parallel or parallel-to-serial conversion or to change the word structure and/or serial data rate (baud rate) of the data.

While most buffers are FIFO (First In, First Out), some advanced units can function as random-access buffers. For most serial buffers, hardware flow control is required, but some also support software (X-ON/X-OFF) control. Most buffers support printing of multiple copies of a document, provided the buffer has enough memory to store the entire print job. collapse


Black Box Explains... Single-Mode Fiber Optic Cable

Multimode fiber cable has multiple modes of propagation—that is, several wavelengths of light are normally used in the fiber core. In contrast, single-mode fiber cable has only one mode of... more/see it nowpropagation: a single wavelength of light in the fiber core. This means there’s no interference or overlap between the different wavelengths of light to garble your data over long distances like there is with multimode cable.

What does this get you? Distance–up to 50 times more distance than multimode fiber cable. You can also get higher bandwidth. You can use a pair of single-mode fiber strands full-duplex for up to twice the throughput of multimode fiber cable. The actual speed and distance you get will vary with the devices used with the single-mode fiber. collapse




Product Data Sheets (pdf)...Rackmountable Manual Switches


  • Manual... 
  • Pro Switching System 1U NBS User Manual
    User Manual for the NBS004A, NBS004MA, NBS006A, NBS006MA, NBS008A, NBS008MA, NBS016A, NBS016MA, NBSALL8, and NBSALL8MGR (Version 1)
 

Product Data Sheets (pdf)...Compact VGA Switches

  • Manual... 
  • Remotely Controlled Layer 1 A/B Switches Manual
    User Manual for the SW1042A-MM, SW1043A-MM, SW1044A-SM, SW1045A-SM (Version 1)
 

Product Data Sheets (pdf)...Automatic Switching System

Results 61-70 of 82 << < 6 7 8 9 > 
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