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COMSPHERE 3800 Series Modems – Model 3830
Glossary-8 August 1998 3830-A2-GB91-30
ITU-T V.42 ITU-T standard for error control protocol.
ITU-T V.42 bis 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.
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.
MNP This protocol (Microcom Networking Protocol)
detects and corrects data errors caused by
telephone line noise and signal distortion. MNP5
includes data compression.
modem (Modulator/DEModulator). A device that
transforms signals from digital to analog form and
vice versa.