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Glossary
Glossary-93160-A2-GB21-50 January 1997
TXC Transmit Clock. V.24 circuit 114.
TXD Transmit Data. V.24 circuit 103.
T1 A wideband digital interface operating at 1.544 Mbps.
UAS Unavailable Seconds. A count of 1-second intervals when service is unavailable.
UDP User Datagram Protocol. A TCP/IP protocol describing how messages reach
application programs within a destination computer.
UL Underwriter’s Laboratories, Inc. An organization which promotes product safety.
Vac Volts alternating current.
Vdc Volts direct current.
VF Voice Frequency.
V.24 A CCITT standard for a low-speed, 25-position, DCE/DTE interface.
V.35 A CCITT standard for a high-speed, 34-position, DCE/DTE interface.
V.54 A CCITT standard for local and remote diagnostic loopback tests.
V.54 Loop 2 A CCITT standard for a data channel loopback (DCLB).
V.54 Loop 3 A CCITT standard for a data terminal loopback (DTLB).
WA N Wide Area Network. A network that spans a large geographic area (e.g., a country).
warmStart trap An SNMP trap that indicates that the device has reinitialized itself.
XTXC External Transmit Clock. V.24 circuit 113.
Yellow Alarm An outgoing signal transmitted when a DS1 terminal has determined that it has lost
the incoming signal.
1in8 Test A test pattern consisting of a one (1) followed by seven zeros (on the network
only).
3000 Series Carrier A rack-mounted device containing 17 slots in which to place circuit cards.
511 Test A pseudo-random bit sequence (PRBS) that is 511 bits long (on the data ports
only). This is a PRBS 2
9
–1 test.