Atm Results; Cell Count; Errors - JDS Uniphase SmartClass User Manual

Table 28
Table 28 Noise sources and tones
Noise Source
ISDN BRI
HDSL passband center
HDSL passband max
HDSL2
T1 passband center
E1 passband center

ATM results

ADSL typically transports data over ATM (Asynchronous Transfer Mode) circuits. (VDSL, as well as
some ADSL systems transmit over packet mode circuits.) The ATM category provides results that
help you troubleshoot these connections. These results are helpful if IP pings are not working, but
your tester is still sending and receiving ATM cells.

Cell Count

Table 29
Table 29 ATM Cell Count results
Result
User
OAM
Bad
Dropped

Errors

Table 30
Table 30 ATM Error results
Result
HEC
OCD
LCD
June 2014
lists common noise sources and the corresponding frequencies and tones.
describes the ATM Cell Count results.
Definition
Number of cells that contain user data.
Number of cells that contain OAM data.
Number of bad cells received.
Total number of dropped cells. The ATM network will discard or "drop" erred cells
which must then be retransmitted (this is done automatically). The SmartClass Triple
Play Services counts the number of ATM cells and how many were dropped, giving an
indication of service quality.
describes the ATM Error results.
Definition
Header error correction. Errored ATM cell headers that have been automatically cor-
rected.
Out-of Cell Delineation. Occurs when cells fail to contain a valid HEC (Header Error
Check)
A Loss of Cell Delineation. Initially triggered when an OCD condition occurs and
doesn't clear for more than 4ms.
SmartClass TPS User's Guide
22035456, Rev 001
Noise Frequency (kHz)
40
196
392
274
772
1024
Chapter 16 Test Results
Tone # Tone Frequency (kHz)
9 38.8125
45 194.0625
91 392.4375
64 276
179 772
237 1022
DSL Results
125