Verilink AS2000: The Basics (880-502981-001) Product Manual - Manual (Page 150)

Acronyms and Definitions
Glossary-30 Verilink Access System 2000: Basics
line removal and restoral A mechanism to shut down a line
when transmission cannot be
supported due to excessive errors.
These error conditions are defined
by threshold values which can be
specified for BER , UAS , SES , or
CRC error event alarms. When
these thresholds are exceeded, the
line is automatically removed from
service. When these error
conditions return to levels below
the specified thresholds for a user-
definable period of time, the line is
restored automatically. Restoral
can also occur manually or at a
specified time.
line restoral mode With the AS2000 Quad/IMUX, node
management software such as
Node Manager monitors each level
1 signal separately over a fifteen-
minute timeframe. If the errors
detected during a monitoring cycle
exceed the alarm threshold, the
line is put out of service for the
remainder of the monitoring
period. SES and UAS error counts
are reset every 15 minutes.
link The communications facility that
interconnects two sets of data
circuit- terminating equipment (for
example, a network line).
LLB See line loopback .
LLB BOP Send line loopback bit-oriented
protocol to put up a line loop at
the far-end CSU’s network port.
LOC See loss of clock (LOC) .
Local Area Network A type of high-speed data
communications connection where
all segments of the transmission
medium are in the office.
local loopback A condition in which a CSU loops
data about to be transmitted back
into its own receive circuitry. Also
known as repeater loopback.
LOF See loss of frame (LOF) .
LOFC See loss of frame count (LOFC) .
LOFS See loss of frame second
(LOFS) .
log in To establish a connection through
an input device by identifying an
authorized user.