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  • Quick Start Guide... 
  • 2-Port Hardened Serial Server QSG
    Quick Start Guide for the LES422A (Version 1)
 
  • Pdf Drawing... 
  • GigaStation2 SC Simplex Snap Fitting, Office White PDF Drawing
    PDF Drawing for FMT343-R3 (Version 1)
 

Black Box Explains...16850 UART.

The 16850 Universal Asynchronous Receiver/Transmitter (UART) features a 128-byte First In First Out (FIFO) buffer. When implemented with the appropriate onboard drivers and receivers, it enables your onboard serial ports... more/see it nowto achieve sustained data rates of up to 460.8 kbps.

The 16850 UART includes automatic handshaking (RTS/CTS) and automatic RS-485 line control. It also features external clocking for isochronous applications, a performance enhancement not offered by earlier UARTs. collapse


Product Data Sheets (pdf)...Smart 64K CSU/DSUs

  • Pdf Drawing... 
  • Black GigaBase2 CAT5e Jack with Universal Wiring
    Drawing for the FMT921-R2 and FMT921-R2-25PAK.
 

Black Box Explains...IRQs, COM Ports, and Windows

Windows® 95 normally requires each serial port to have its own unique Interrupt Request Line (IRQ). However, if you use a third-party communications driver that supports IRQ sharing, you can... more/see it nowshare interrupts. Unfortunately, data throughput will not be as high as with single interrupt port configurations.

With Windows NT®, you can share interrupts across multiple ports as long as the serial ports have an Interrupt Status Port (ISP) built into the card.

The Interrupt Service Routine, a software routine that services interrupts and requests processor time, reads the ISP and is immmediately directed to the port that has an interrupt pending. Compared to the polling method used if the serial ports don’t have an ISP, this feature can determine which port generated the interrupt up to four times more efficiently—and it almost eliminates the risk of lost data. Windows NT supports the ISP by enabling the user to configure the registry to match the card’s settings. Black Box models IC102C-R3, IC058C, and IC112C-R3 all have ISPs and come with a Windows NT setup utility to simplify installation and configuration.

If your serial port doesn’t have an ISP, the Interrupt Service Routine has to poll each port separately to determine which port generated the interrupt. collapse

  • Pdf Drawing... 
  • GigaBase 350 CAT5e Patch Cable with Snagless Boots (Red) PDF Drawing
    PDF Drawing for the EVNSL83 series.
 
  • Pdf Drawing... 
  • GigaBase 350 CAT5e, 350-MHz Solid Bulk Cable (PVC, Green) PDF Drawing
    PDF Drawing of the EYN859A-PB-1000 (1)
 
  • Quick Start Guide... 
  • 10BASE-T/100BASE-TX Hardened Ethernet Extender over vDSL
    (Version 1)
 
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