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COMSPHERE 3800 Series Modems
Glossary-6 September 1998 3810-A2-GB30-30
ITU-T V.22 A standard for modems operating full-duplex with asynchronous or synchronous data at
1200 bps over the dial network (PSTN).
ITU-T V.22bis A standard for modems operating full-duplex with asynchronous or synchronous data at
1200 or 2400 bps over the dial network (PSTN).
ITU-T V.27ter A fax communications standard for modems operating half-duplex with synchronous
data at 2400 and 4800 bps.
ITU-T V.29 A fax communications standard for modems operating half-duplex with synchronous
data at 7200 and 9600 bps.
ITU-T V.32 A standard for modems operating full-duplex with asynchronous or synchronous data at
4800 or 9600 bps on switched (dial) or leased telephone lines.
ITU-T V.32bis A standard for modems operating full-duplex with asynchronous or synchronous data
over dial networks (PSTN) or leased lines at 14,400, 12,000, 9600, 7200, or 4800 bps.
ITU-T V.42 ITU-T standard for error control protocol.
ITU-T V.42bis ITU-T standard for data compression.
ITU-T V.54 ITU-T standard for local and remote diagnostic loopback tests.
JM8 A jack used for leased-line networks. Pins 1 and 2 are the transmit pair and Pins 7 and 8
are the receive pair.
keypad A set of seven keys surrounding the DCP’s LCD. These keys are used to select
configuration options and to maneuver through the DCP.
LCD Liquid Crystal Display. A thin sandwich of two sealed glass plates containing liquid
crystal material. When voltage is applied, the amount of light able to pass through the
glass plates is altered so that messages may be ‘‘written” on the display.
leased line A private line connection exclusively for the user. No dialing is necessary.
LED Light-Emitting Diode. A light or status indicator on the DCP that glows in response to
the presence of a certain condition (e.g., Alrm).
local analog loopback The modem’s transmit VF signal is looped to its receiver.
long space disconnect A disconnect can occur if the modem receives an extended space from a remote modem;
for example, when a remote modem is commanded to disconnect, it transmits a
continuous space to the modem before disconnecting.
loopback test Any test that verifies a device’s integrity by connecting the device’s output of one
direction to the device’s input of the other direction, then checking the received signal for
errors.
LSD Line Signal Detect. A signal between the DTE and modem indicating energy exists on
the transmission circuit.
menu tree The structure containing the 3800 Series menu hierarchy starting at a Top-Level menu
and extending down to various modem functions.