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 |
| 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 |
| 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 |
HDB3 | High Density Bipolar 3 Coding: A |
| scheme defined for E1 transmission which ensures sufficient |
| signaling transitions for robust clock/data recovery. |
IS | |
| error reporting. |
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