Multitech CommPlete MT5634HD8, User Manual, Page: 90 / 99

MT5634HD8 User Guide
84 CommPlete Communications Server
Twisted pair wiring : A type of cabling with
one or more pairs of insulated wires wrapped
around each other. An inexpensive wiring
method used for LAN and telephone
applications, also called UTP wiring.
U
UART (Universal Asynchronous
Receiver/Transmitter)
: A chip that transmits
and receives data on the serial port. It converts
bytes into serial bits for transmission, and vice
versa, and generates and strips the start and
stop bits appended to each character.
UNIX : A multi-user, multitasking operating
system, first developed by AT&T in the 1970’s.
It now runs on a wide variety of computer
systems from micro to mainframe, and is
controlled by UNIX System Laboratories
(USL).
UTP (unshielded twisted pair) : Telephone-
type wiring.
V
V.21 : The CCITT modulation standard for
300 bps, full-duplex transmission over dial-up
lines.
V.22 : The CCITT modulation standard for
1200 bps, full-duplex transmission over a dial-
up or 2-wire leased line. This is not common in
North America.
V.22bis : The CCITT modulation standard for
2400 bps, full-duplex transmission over a dial-
up or a 2-wire leased line.
V.23 : The CCITT modulation standard for
75/1200 bps, half-duplex transmission over
dial-up lines. This is not common in North
America.
V.24 : The CCITT hardware interface
specification for interchange circuits between
the DTE and DCE.
V.25bis : A dialing command set developed by
the CCITT for both synchronous and
asynchronous devices. Since V.25bis does not
provide any modem configuration commands, it
is primarily used for its synchronous dialing
commands, while the “AT” commands are used
for asynchronous dialing and for modem
configuration.
V.26 : The CCITT modulation standard for
2400 bps, full-duplex transmission over 4-wire
leased lines. Primarily for synchronous use. Not
common in North America.
V.27 : The CCITT modulation standard for
4800 bps, full or half-duplex transmission.
Primarily for synchronous use. Not common in
North America. V.27ter is used by Group 2 fax-
modems for 4800 bps fax transmission.
V.29 : The CCITT modulation standard for
9600 bps, 2-wire (half-duplex) or 4-wire (full-
duplex) transmissions, primarily over leased
lines (synchronous or asynchronous). V.29 is
used for Group 3 fax transmissions.
V.32 : The CCITT modulation standard for
synchronous or asynchronous input to be
transmitted at 9600 bps over the PSTN. V.32
operates in half- or full-duplex mode.
V.32bis : The CCITT modulation standard for
synchronous or asynchronous input to be
transmitted at 14,400 bps over the PSTN.
V.32bis operates in half- or full-duplex mode.
V.32terbo : An AT&T recommendation for
synchronous or asynchronous input to be
transmitted at 14,400 bps over the PSTN.
V32terbo operates in half- or full-duplex mode.
V.32 : The CCITT modulation standard for
synchronous or asynchronous input to be
transmitted at 9600 bps over the PSTN. V.32
operates in half- or full-duplex mode.
V.33 : A CCITT modulation standard for
14,400 bps synchronous transmission over a
40wire leased line.
V.35 : The CCITT hardware interface
specification commonly used by DSU/CSUs and
other high-speed devices.
V.42 : A CCITT recommendation for error-control
hardware on a modem that accepts
asynchronous input. V.42 recommends for
manufactures to implement LAP-M and makes a
provision for MNP-5 as a alternative because of
its popularity. Most modem makers provide
both.