1. Forum
  2. Usenet
  3. COMP.SYS.IBM.PS2.HARDWARE

  • You're not my type [3270 terminal types and coax controller chips]]

    From Louis Ohland@21:1/5 to All on Fri Nov 19 11:20:16 2021
    So. Without the benefit of industrial plum brandy, I >think< there is a slightly better understanding of the 3270 emulators.

    Terminal types A and B. The functionality of the terminal is the type.

    Coax controller chip, type A or B. B is the original, RG-62, 93 ohms.
    Type A came out later, it added the ability to use 150 ohm STP -WITHOUT- needing an external balun [so, it was gender-fluid, 93 -or- 150]

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From gfretwell@aol.com@21:1/5 to All on Fri Nov 19 16:59:00 2021
    On Fri, 19 Nov 2021 11:20:16 -0600, Louis Ohland <ohland@charter.net>
    wrote:

    So. Without the benefit of industrial plum brandy, I >think< there is a >slightly better understanding of the 3270 emulators.

    Terminal types A and B. The functionality of the terminal is the type.

    Coax controller chip, type A or B. B is the original, RG-62, 93 ohms.
    Type A came out later, it added the ability to use 150 ohm STP -WITHOUT- >needing an external balun [so, it was gender-fluid, 93 -or- 150]

    Using the proper balun they would all run on twisted pair. Our whole
    office was on the IBM wiring system that used the big black "token
    ring" jacks and you could plug in the appropriate balun/adapter for
    3270 coax, TV/baseband coax, Ethernet, 4 wire Baseband or POTS
    service. Obviously it also did T/R. We had a mix of stuff we used. I
    was the only one using 4 wire baseband and Eduquest was using
    Ethernet. Most were 3270 terminals.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)