Edi transmission_number identifying the service and service user.

Ibm information exchange_self explanatory.

Mail_postal service document delivery.

X.400_ccitt message handling system.

Telefax_device used for transmitting and reproducing fixed graphic material (as printing) by means of signals over telephone lines or other electronic transmission media.

Telegraph_text transmission via telegraph.

Telex_transmission of text/data via telex.

File transfer access method_according to iso.

Internal mail_internal mail address/number.

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.

Telephone_voice/data transmission by telephone.

Teletext_transmission of text/data via teletext.

Electronic mail_creating/sending/receiving of unstructured free text messages or documents using computer network, a mini-computer or an attached modem and regular telephone line or other electronic transmission media.

Arinc_communications number assigned by aeronautical radio inc.

Telemail_transmission of text/data via telemail.

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).

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).

Postbox no._self explanatory.

Geis (general electric information service) mailbox_self explanatory.

S.w.i.f.t._communications address assigned by society for worldwide interbank financial telecommunications s.c.

Sita_communications number assigned by societe internationale de telecommunications aeronautiques (sita).

Extension_telephone extension.

Cable address_self explanatory.