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  • Quick Start Guide... 
  • USB 2.0 Hub (10-Port) QSG
    Quick Start Guide for the IC640A (Version 1)

Product Data Sheets (pdf)...9600 FP Modems

Product Data Sheets (pdf)...T1 WAN Access Router

Product Data Sheets (pdf)...T1/FT1 CSU/DSU Managed T1/FT1 CSU/DSUs

  • Manual... 
  • Short-Haul Modem: C Async (SHM%X96C Async), 4-Wire, Standalone User Manual
    User Manual for the ME800A-R4 (Version 1)

Black Box Explains... Printer Sharing with Windows

Unlike the earlier DOS operating systems, Windows® doesn’t check to see if the printer is busy at the very beginning of the printing process. Windows will send out data to... more/see it nowstart a job even if the printer is signaling busy or unavailable. If your print sharer doesn’t have a buffer, critical printer-initialization information can be lost before your job is started. Once the initialization information is lost, the printer cannot interpret the job correctly.

A buffered print-sharing device is the most practical solution. When Windows starts printing to a buffered port, it “thinks“ it’s talking directly to the printer, and the critical initialization information is stored by the buffer. The buffer can send out a busy signal to Windows, so it delays sending more information until the buffer is accessible again. collapse

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

  • Manual... 
  • USB Solo (USB to Serial), DB9 with Cable
    Installation and User Guide
  • Manual... 
  • USB Ultimate Extender over Single-Mode Fiber (4-Port) User Manual
    User Manual for the IC406A (Version 2)
  • Manual... 
  • Fiber Optic Multipoint Line Driver-ST
    Installation and User guide (Feb-98)
Results 101-110 of 346 << < 11 12 13 14 15 > >> 


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