Aethra d2061 ユーザーズマニュアル

ADSL TESTER D2061 

                                                                                         USER’S MANUAL 

 

or the other. Therefore, if the circuit under test uses the fast path, refer to the FAST 
results.  

FEC Forward Error Correction FEC indicates the number of super frames that had at 
least one forward error correction in one of its 68 data frames. 

CRC: Cyclic Redundancy Check Error indicates that in the data stream, a received 
CRC-8 code is not identical to the locally calculated CRC-8 code. It is a count of the 
number of super frames that had an incorrect CRC in the path. 

HEC: Header Error Control indicates that an ATM cell with an incorrect HEC is 
contained in the data stream. It is a count of the number of super frames that had at 
least one ATM cell with an error HEC. 

Link Drop #: In this field is displayed the number of attempts the device has carried 
out in order to perform the test (if into COMMON SETUP page the field ‘Re-open 
request’ is set to ‘YES’). 

This page shows statistics at ATM layer, among data displayed you can see 
transmitted and received cells, counters regarding OAM maintenance cells received 
and unmapped cells. 

The left column displays results for the upstream signal (received by the ATU-C); the 
right column shows results for the downstream signal (received by the ATU-R). The 
first part shows the number of transmitted (UP) and received (DOWN) cells in FAST 
or INTERLEAVED mode. 

Follows the counter of alarms regarding OAM maintenance cells received (DOWN) 
which meaning is explained below: 

AIS: Alarm Indication Signal, shows the presence of alarms detected on line. 

RDI: Remote Defect Indication, counter of alarm indication sent by a remote device. 

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CHAPTER 6 - SMART STATUS