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Definition of Terms/Acronyms
The following are terms and phrases used within this manual (shown in
italics
), or
which are found in documents associated with this equipment.
1+1
The Term “1+1” refers to line protection where identical
information is transmitted on two redundant lines. The Receiver
chooses the “best” line to use based on the
BER
of the line.
AIS
Alarm Indication Signal: Used in E1 signaling, the AIS is a
predetermined bit stream (all ones) that is transmitted (forwarded)
upon the loss of an incoming E1 signal or when the E1 signal is
disrupted.
AN
Auto Negotiation: A signaling protocol used by an Ethernet PHY to
determine the characteristics (speed, duplex mode) of its “link
partner” and configure itself automatically
BER
Bit Error Rate: The percentage of bits with errors divided by the
total number of bits that have been transmitted, received or
processed over a one second time period.
CLI
Command Line Interface: An interface screen, often DOS-based,
used for system management and diagnostics requiring the user to
type commands rather than use a
GUI
.
CV
Code Violation: An anomaly of a decoded physical-layer signal
stream resulting in coding (signaling) error(s). Noise bursts or
intermittent connections on a link are the usual causes of code
violations; an
HDB3
coding error.
DDMI
Digital Diagnostic Monitor Interface: A defined serial interface and
data format typically used to access SFP internal information
FFL
Fiber Fault Loopback: When the fiber line fails, the Ethernet port
that is being forwarded over the fiber line is forced out of LINK.
Similar to the Fiber Alert function.
GUI
Graphical User Interface: Software that provides a visual interface
to enable an end-user to manage and monitor network devices.
HDB3
High Density Bipolar 3 Coding: A physical-layer signal encoding
scheme defined for E1 transmission which ensures sufficient
signaling transitions for robust clock/data recovery.
IS
In-Service stat is the normal state of an active port with normal
error reporting.