
Glossary
GL-27
Cisco 6260 Hardware Installation Guide
OL-2365-02
TC-PAM
trellis coded pulse amplitude modulation. Trellis coding provides forward error correction, while
pulse amplitude modulation is a modulation scheme where a continuous analog signal is represented
with a series of discrete analog samples.
TCP
Transmission Control Protocol. The major transport protocol in the Internet suite of protocols
providing reliable, connection-oriented, full-duplex streams. See
SLIP
.
Telnet
The virtual terminal protocol in the Internet suite of protocols. It allows users of one host to log in to
a remote host and use resources as if they were connected to a local system.
TFTP
Trivial File Transfer Protocol. A simple file transfer protocol (a simplified version of FTP) that allows
files to be transferred from one computer to another over a network. TFTP does not offer
password security.
tip and ring
A pair of wires that provide the electrical connection between a telephone set and the local CO. The
more electrically positive side of a POTS telephone line (0 V) is the tip. Its counterpart is the ring,
which is the more negative side, 52 v).
topology
Physical arrangement of network nodes and media within a networking structure.
trailer
A block of information that is transmitted at the end of a message to trace error impacts and
missing blocks.
training
The handshake procedure that initiates and establishes an end-to-end
x
DSL connection
training mode
The mode, either standard or quick, that a DSLAM port employs when it is training to a CPE. The
training mode uses RADSL technology to adjust line speed according to noise conditions on the
transmission line.
Transmission
Control Protocol
See
TCP
.
trap
Message sent by SNMP agent to an NMS, a console, or a terminal to indicate the occurrence of a
significant event, such as a specifically defined condition or a threshold that was reached. See also
alarm
and
event
.
tree topology
A method of connecting devices that is similar to a bus topology, except that tree networks can contain
branches with multiple nodes. Transmissions from a station propagate the length of the medium and
are received by all other stations. Compare with
bus topology
,
daisy-chain topology
,
ring topology
, and
star topology
.
trellis coded pulse
amplitude
modulation
See
TC-PAM
.
trellis encoding
A channel coding technique which provides forward error correction capability.
Trivial File Transfer
Protocol
See
TFTP
.
twisted pair
Two insulated copper wires twisted together with the twists or lays varied in length to reduce potential
signal interference between the pairs.
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Страница 208: ...B 8 Cisco 6260 Hardware Installation Guide OL 2365 02 Appendix B Port Mapping Specifications Standard Telco Color Chart ...
Страница 214: ...C 6 Cisco 6260 Hardware Installation Guide OL 2365 02 Appendix C Connector and Pinout Specifications Ethernet Port ...