Deutsche Telekom T-Eumex 504PC SE - Manual (Page 111)

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Appendix
D-channel
This is the control channel of an ISDN connection, and it has a transmission rate of
16 kbit/s (S0). It is used for the transmission of control information, service indicator,
MSN, tariff information, etc.
Dial-up network
Your computer can use the Microsoft Windows dial-up network facility to connect to
an Internet service provider via a modem.
Doorline
Range of Deutsche Telekom doorstation equipment and adapters for the connection
of other manufacturers’ doorstation equipment to Deutsche Telekom communica-
tions systems.
DTMF
Stands for “dual tone multi-frequency,” also known as voice frequency dialling. The
dialling signals and control functions are transmitted in the form of tones at various
frequencies.
DTMF post-dialling
DTMF post-dialling is only possible during an external call when, for example, an
automatic announcement prompts you to post-dial digits and symbols (1 - 0, * and
#), during fax polling or other applications, e.g. T-NetBox.
ECT (Explicit Call Transfer)
This is an ISDN feature. If you use ECT to forward an external call to an external sub-
scriber, the calls are connected in the telephone exchange and (in the case of
directly-dialled calls), billed to your account. You have no control over the duration of
the forwarded call.
E-mail
E-mail is a written message transmitted via an on-line service or the Internet to
another subscriber’s e-mail address. The e-mail protocols used in the Internet enable
the attachment of data (pictures, programs, etc.) to the e-mail.
Enquiry
You can hold a call and make an enquiry call to another internal or external sub-
scriber, then return to your first call.
Exchange
A node in the public telecommunications network.
External line access
External line access levels regulate access to an external line. You can, for example,
specify which subscribers are not allowed to make long-distance calls.