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Glossary
GL-8
3162-A2-GB20-40
August 2000
Virtual terminal protocol in the Internet suite of protocols. Allows the user of one host
computer to log into a remote host computer and interact as a normal terminal user of the
remote host.
A notification message to the SNMP manager when an unusual event occurs on a network
device, such as a reinitialization.
A term for a digital carrier facility used to transmit a DS1 formatted digital signal at
1.544 Mbps. It is used primarily in North America.
Transmit. To send signals from a device.
Transmit Data. Pin 2 of the EIA-232 interface that is used by the DTE to transmit data to
the modem. Conversely, the modem uses Pin 2 to receive data from the DTE.
Unavailable Seconds. A count of one-second intervals when service is unavailable.
User Datagram Protocol. A TCP/IP protocol describing how messages reach application
programs within a destination computer.
Underwriter’s Laboratories, Inc. An organization which promotes product safety.
An ITU-T standard for a low-speed, 25-position, DCE/DTE interface.
An ITU-T standard for a high-speed, 34-position, DCE/DTE interface.
An ITU-T standard for local and remote diagnostic loopback tests.
An ITU-T standard for a data channel loopback (DCLB).
An ITU-T standard for a data terminal loopback (DTLB).
Volts alternating current.
Volts direct current.
Voice Frequency. The part of the audio frequency range used to transmit voice sound
(usually 300 Hz to 3400 Hz). This band is used by the modem for its modulated signal.
Wide Area Network. A network that spans a large geographic area.
An SNMP trap that indicates that the device has reinitialized itself.
External Transmit Clock. V.24 circuit 113.
An outgoing signal transmitted when a DS1 terminal has determined that it has lost the
incoming signal.
Telnet
trap (SNMP)
T1
TX
TXD
UAS
UDP
UL
V.24
V.35
V.54
V.54 Loop 2
V.54 Loop 3
Vac
Vdc
VF
WA N
warmStart trap
XTXC
Yellow Alarm