Paradyne 9161 User Manual page 51

Glossary
ESD
ESF
FCC
FDL
IP
ITU
LBO
LED
LOF
LOFC
loopback
LOS
MUX
NAM
OOF
PDV
PSTN
QRSS
SES
SNMP
UAS
Vac
VF
Yellow Alarm
GL-2
Electrostatic discharge.
Extended Superframe. The T1 transmission standard that specifies 24 frames as an
extended superframe to be used for frame synchronization and to locate signaling bits.
Federal Communications Commission.
Facility Data Link. The selected bits in the ESF format that are used for control, monitoring
and testing.
Internet Protocol. The TCP/IP standard protocol that defines the IP as a unit of information
passed across an Internet and provides the basis for packet delivery service. IP includes
the ICMP control and error message protocol as an integral part. The entire protocol suite
is often referred to as TCP/IP because TCP and IP are the two most fundamental
protocols.
International Telecommunication Union. Formerly known as the Consultive Committee on
International Telegraphy and Telephony (see CCITT ).
Line Build-out. The amount of attenuation of the transmitted signal that is used to
compensate for the length of wire between the transmitter and the receiver.
Light Emitting Diode. A light or status indicator that glows in response to the presence of a
certain condition (e.g., ALM on the front panel for an alarm condition ).
Loss of Frame. Occurs when a DS1 terminal is unable to synchronize on the DS1 signal
for some interval (nominally 2 1/2 seconds).
Loss of Frame Count. A count of the number of LOFs declared.
Used to test various portions of a data link in order to isolate an equipment or data line
problem. A diagnostic procedure that sends a test message back to its origination point.
Loss of Signal. The T1 line condition where there are no pulses.
Multiplexer.
Network Access Module. A type of CCA that accesses or interfaces with the network.
An error condition in which two out of four synchronization bits are in error.
Pulse Density Violation.
Public Switched Telephone Network.
Quasi-Random Signal. A test pattern simulating a random pattern of digital ones and zeros
used to simulate normal transmission.
Severely Errored Seconds. A second with 320 or more CRC6 error events or one or more
OOFs occurring.
Simple Network Management Protocol. A generic network management system that
allows the device to be managed by any industry-standard SNMP manager.
Unavailable Seconds. A count of 1-second intervals when service is unavailable.
Volts alternating current.
Voice Frequency.
An outgoing signal transmitted when a DS1 terminal has determined that it has lost the
incoming signal.
November 1996 9161-A2-GB20-00