![]() Introduction to IBM 3770 SNA/RJE Communications |
Introduction to IBM 3770 SNA/RJE Communications Who Uses 3770 SNA/RJE Communications Today? What Did 3770 SNA/RJE Terminals Look Like? What is SNA/RJE? 3770 SNA/RJE Communications Frequently Asked Questions 3770 SNA/RJE Communications Glossary Things to Consider When Purchasing SNA/RJE Emulation Interested in IBM 3780 BSC/RJE Communications? |
Serengeti Systems, makers of 3770Link, brings you this web site as an information
resource for IBM 3770 SNA/RJE communications,
RJE terminal emulation, and IBM's Systems
Network Architecture (SNA). If you have questions
or comments on this site, feel free to send us an e-mail. If you are seeking a 3770 SNA/RJE solution, we hope this information is helpful. Back in the 1970s, IBM manufactured a family of keyboard/printer remote job entry (RJE) data communications terminals that included models designated the IBM 3776 and 3777 Communications Terminals. (Less sophisticated 3771 through 3775 terminals were also manufactured.) This entire family of terminals is generally referred to as simply 3770 terminals. The 3776/3777 terminals were batch or RJE data terminals which used punched cards and typically were configured with a card reader, one or two diskette drives, a card punch, and a line printer. They used IBM's System Network Architecture (SNA) to transmit and receive data to and from an IBM mainframe computer. A terminal usually connected over dial-up or leased lines at line speeds from 2400 bits per second (bps) using Bell 201C modems or at 4800 bps using Bell 208B modems. Some models supported high speed connections of up to 20,400 bps. Today, most 3770 emulation occurs at 9600 bps or faster using V.32 and V.34 modems, or are connected by local area networks to the mainframe. The RJE subsystems on the IBM mainframes are known as MVS/JES2, VS1/RES/RTAM, and DOS/VS/POWER. Today's SNA/RJE communications is provided almost exclusively by emulating the original 3776/3777 terminals. Emulation is performed by software programs on all classes of machines -- from mainframes themselves all the way down to PCs. |
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Site last updated 6/3/2004