home *** CD-ROM | disk | FTP | other *** search
-
-
-
- APPENDIX E -- RBBS-PC and the Hearing-Impaired E-1
-
-
- APPENDIX E -- RBBS-PC and the Hearing-Impaired
- ----------------------------------------------
- Telecommunications Devices for the Deaf (TDDs) use the Baudot character set
- (i.e. 5-bit) and utilize modems that transmit at 45 baud and do not
- generate a carrier signal. This is because such devices were initially
- adaptations of surplus Western Union TTY machines for telephone
- communications. The widespread use of Baudot devices by the hearing-
- impaired, the previous high cost of computers and modems, and the lack of
- software designed for electronic communications, has impeded the change to
- ASCII communications by the hearing-impaired community.
-
- Equipment manufacturers have also made it difficult for the deaf to change.
- When TDD's with ASCII code transmission capability began to be offered, the
- majority of manufacturers limited them to only 110 baud and put disclaimers
- in their manuals that said ASCII was available for use but that "computer
- language" was "less reliable" and hard to use. Their limiting of the TDD's
- output screen to 12 to 20 characters further compounded the problem because
- the screen would overwrite several times to display one line of text from a
- host system. The manufacturers' "solution" to this problem was to
- recommend printers for communication with such "host" systems as RBBS-PC.
- Some units now offer both 110 and 300 baud ASCII transmission in addition
- to the 45 baud Baudot. Unfortunately, these typically have only 20
- character screens.
-
- In December of 1984, Ted Janossy of Rochester, Minnesota, sent a three-page
- letter to Tom Mack describing the above situation. Ted's letter motivated
- Tom to test and verify the "ring-back" feature of RBBS-PC in 12.4A. It
- had not been tested in earlier versions because Tom assumed (presumptuously
- and insensitively) that "real SysOps don't use ring-back RBBS-PC's." Ted's
- letter awakened Tom to the potential of RBBS-PC to facilitate
- communications among the hearing-impaired. In the awakening, Tom also had
- a chance to look down at his own feet of clay.
-
- RBBS-PC can be configured to answer calls only after a specified number of
- rings (i.e. 15). The telephone companies wire the homes of the
- hearing-impaired such that when the phone rings, the lights within the
- house flash on and off.
-
- With RBBS-PC a SysOp can specify the number of rings RBBS-PC is to wait
- before answering the phone automatically. Setting this number high enough
- allows someone with a hearing impairment time enough to get to the PC
- running RBBS-PC. Pressing the PC's function key 5 (F5) causes RBBS-PC to
- answer the phone immediately. The caller would know that someone was at
- the keyboard because RBBS-PC answered the phone in less than the agreed-
- upon number of rings. The caller would log onto RBBS-PC normally and the
- person at the PC keyboard would be able to see who it was. If the person
- who was called wanted to "chat" with the caller, all they would have to do
- would be to press function key 10 (F10).
-
- If RBBS-PC didn't answer the telephone within the agreed-upon number of
- rings, the caller would know that whomever was being called couldn't come
- to the keyboard. The caller would then log on and leave a message.
-
-