Definition Of Terms/Acronyms - Advantech B+B SMARTWORX IE-iMcV-T1-Mux/4 +Ethernet User Manual

DEFINITION OF TERMS/ACRONYMS

The following are terms and phrases used in this manual, or found in documents
associated with this equipment.
1+1
AIS
AMI
AN
B8ZS
BER
CLI
CV
DDMI
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.
Alarm Indication Signal - used in T1 signaling, the AIS is a
predetermined bit stream (all ones) that is transmitted (forwarded)
upon the loss of an incoming T1 signal or when the T1 signal is
disrupted.
Alternate Mark Inversion - a bipolar coding scheme used to
accommodate the ones density requirements of T1 lines in such a
way that successive ones, or marks, must alternate in polarity. AMI
is an older standard, but still used for transporting voice
transmissions.
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
Bipolar with 8-Zero Substitution - a line code used for T1 that
converts any string of 8 zeros of a DS-1 signal into a code which, at
the far end, is converted back to eight zeros. B8ZS coding actually
inserts Bipolar Violations (BPVs) that are realized at the next
multiplexer point and are taken out of the signal.
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.
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.
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.
Digital Diagnostic Monitor Interface - a defined serial interface and
data format typically used to access SFP internal information.
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