ADTRAN Express L128T S User Manual page 186

Glossary
TA
Terminal Adaptor. A DCE that connects to the ISDN S-Inter-
face and enables non-ISDN terminal equipment to communi-
cate over the ISDN.
TE1
Terminal Equipment Type 1. ISDN-compatible terminals.
Telnet
The TCP/IP standard protocol for remote terminal connec-
tion service. Telnet allows a user at one site to interact with a
remote timesharing system at another site as if the user's ter-
minal were connected directly to the remote machine.
TCP/IP
Transmission Control Protocol/Internet Protocol. A set of
protocols developed by the Department of Defense to link dis-
similar computers across many kinds of networks.
twisted pair
Two wires twisted around each other to reduce induction (in-
terference) from one wire to the other. Several sets of twisted
pair wires may be enclosed in a single cable. Twisted pair is
the normal cabling from a central office to your home or of-
fice, or from your PBX to your office phone. Twisted pair wir-
ing comes in various thicknesses. As a general rule, the
thicker the cable is, the better the quality of the conversation
and the longer cable can be and still get acceptable conversa-
tion quality. However, the thicker it is, the more it costs.
2B+D
The Basic Rate Interface (BRI) in ISDN. A single ISDN circuit
divided into two 64 kbps digital channels for voice or data
and one 16 kbps channel for low speed data (up to 9,600 baud)
and signalling. 2B+D is carried on one or two pairs of wires
depending on the interface, the same wire pairs that today
bring a single voice circuit into your home or office. See ISDN.
23B+D
In ISDN, also known as the Primary Rate Interface. A circuit
with a wide range of frequencies that is divided in twenty-
three 64 kbps paths for carrying voice, data, video, or other in-
formation simultaneously. It bears a remarkable similarity to
today's T1 link, except that T1 carries 24 voice channels. In ISDN,
23B+D gives twenty-three channels and one D channel for
out-of-band signalling. However, in T1, signalling is handled
in-band. See ISDN.
Glossary-8 Express L128T S/T User Manual 61202070L3-20