Change Indicators

* 3155  Communication channel qualifier                            [C]

  Desc: Code identifying the type of communication channel being used.

  Repr: an..3

   AA     Circuit switching
             A process that, on demand, connects two or more data
             terminal equipments and permits the exclusive use of a
             data circuit between them until the connection is
             released (ISO).
   AB     SITA
             Communications number assigned by Societe Internationale
             de Telecommunications Aeronautiques (SITA).
   AC     ARINC
             Communications number assigned by Aeronautical Radio Inc.
   AD     AT&T mailbox
             AT&T mailbox identifier.
   AE     Peripheral device
             Peripheral device identification.
   AF     U.S. Defense Switched Network
             The switched telecommunications network of the United
             States Department of Defense.
   AG     U.S. federal telecommunications system
             The switched telecommunications network of the United
             States government.
   CA     Cable address
             Self explanatory.
   EI     EDI transmission
             Number identifying the service and service user.
|  EM     Electronic mail
             Exchange of mail by electronic means.
   EX     Extension
             Telephone extension.
   FT     File transfer access method
             According to ISO.
   FX     Telefax
             Device used for transmitting and reproducing fixed
             graphic material (as printing) by means of signals over
             telephone lines or other electronic transmission media.
   GM     GEIS (General Electric Information Service) mailbox
             Self explanatory.
   IE     IBM information exchange
             Self explanatory.
   IM     Internal mail
             Internal mail address/number.
   MA     Mail
             Postal service document delivery.
   PB     Postbox number
             Self explanatory.
   PS     Packet switching
             The process of routing and transferring data by means of
             addressed packets so that a channel is occupied only
             during the transmission; upon completion of the
             transmission the channel is made available for the
             transfer of other packets (ISO).
   SW     S.W.I.F.T.
             Communications address assigned by Society for Worldwide
             Interbank Financial Telecommunications s.c.
   TE     Telephone
             Voice/data transmission by telephone.
   TG     Telegraph
             Text transmission via telegraph.
   TL     Telex
             Transmission of text/data via telex.
   TM     Telemail
             Transmission of text/data via telemail.
   TT     Teletext
             Transmission of text/data via teletext.
   TX     TWX
             Communication service involving Teletypewriter machines
             connected by wire or electronic transmission media.
             Teletypewriter machines are the devices used to send and
             receive signals and produce hardcopy from them.
   XF     X.400
             CCITT Message handling system.