68 MANAGING THE VCN ACCESS CONCENTRATOR
Figure41 VDSL QAM Channel Status Report
Figure41 cont ains the following information:
■QAM Status: In lock—the line to the VCN AP is connected.
The alternate state is Out of lock—the line to the VCN AP is not
connected.
■Restarts, the number of times the line to the VCN AP undergoes a cold
restart. A cold restart occurs when there is a prolonged break in the
line.
■Warm restart, a restart using information that existed the previous
time the link was operational. A warm start occurs when the line is
briefly disconnected or line noise occurs over a period of time.
■SNR, signal to noise ratio.
Reset All Counters
To reset all traffic counters, type 4 in the Management Menu (Figure31)
and press <Enter>; the message appears:
Do you want to proceed (Y/[N])?
QAM channel status
------------------
QAM status: In lock
VDSL restarts: 1
VDSL warm starts: 0
Downstream parameters
DS Symbol rate: 1.964 Mbaud
DS Constellation: 2^5
DS Bit rate: 9.820 Mbps
SNR(@QPSK): 40.250 dB
Upstream parameters
US Symbol rate: 4.910 Mbaud
US Constellation: 2^2
US Bit rate: 9.820 Mbps
SNR(@QPSK): 36.932 dB
SNR Estimate: 36.27 dB
Press <Enter> to continue ...