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Glossary
spoofing
Spoofing reduces the required bandwidth by having devices, such as bridges
or routers, answer for the remote devices. This causes the remote LAN to ap-
pear as if it is still connected to the LAN device even though it is not. The
spoofing saves the WAN bandwidth, because no packet is ever sent out on the
WAN.
synchronous
(1) The condition occurring when two events happen in a specific time rela-
tionship with each other, both under control of a master clock; (2) A method of
data transmission requiring the transmission of timing pulses to keep the
sender and receiver synchronized in their communication used to send blocks
of information. Synchronous data transmission is used in high speed data cir-
cuits because there is less overhead than asynchronous transmission of char-
acters which contain two extra bits per character to effect timing.
T1
Also T-1. A digital transmission link with a capacity of 1.544 Mbps. T1 uses
two pairs of normal twisted wires. T1 normally can handle 24 voice conversa-
tions with each conversation being digitized at 64 kbps. With more advanced
digital voice encoding techniques, it can handle more voice channels. T1 is a
standard for digital transmission in North America.
TA
Terminal Adaptor. A DCE that connects to the ISDN S-Interface and enables
non-ISDN terminal equipment to communicate over the ISDN.
TE1
Terminal Equipment Type 1. ISDN-compatible terminals.
Telnet
The TCP/IP standard protocol for remote terminal connection service. Telnet
allows a user at one site to interact with a remote timesharing system at anoth-
er site as if the user's terminal were connected directly to the remote machine.
TCP/IP
Transmission Control Protocol/Internet Protocol. A set of protocols devel-
oped by the Department of Defense to link dissimilar computers across many
kinds of networks.
twisted pair
Two wires twisted around each other to reduce induction (interference) 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 office, or from your PBX to your office phone. Twisted pair wiring
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 conversation quality. However, the thicker it is, the more it costs.
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Express L768/L1.5 User Manual
61202192L1-1
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