Field
|
Meaning
|
Training
Time
|
The time it
took, or is taking, in seconds for your modem to connect or "train"
to the ADSL line.
|
Loss of Signal
|
A count of the
number of times the modem lost synchronization with the ADSL line.
This value can be non zero as it is normal for the modem to occasionally
lose synchronization. If this value is consistently counting upwards
and the modem is having problems connecting it could be caused by
one of the following reasons:
1. The modem
is not using the same wire pair as the ADSL line is on. All RJ-11
jacks are 4 wire pairs. The modem expects to see the signal on the
inner wire pair.
2. The modem
(if it's an internal one) may be picking up unacceptable noise from
the power supply or some other source on the PC. You can try moving
the modem into a slot as far away from the PCs power supply as possible.
3. The ADSL
line may not be active or may be "down" from the Service
Provider. Will need to check with them to validate.
|
CRC
|
The number of
CRC errors received by the modem.
|
HEC
|
This is the
same count as HEC errors on the ATM/AAL5 screen.
|
FEC
|
The number of
"Forward Error Correction" errors received by the modem. This count
only increments when using Interleaved vs. Fast Path mode with the
DSLAM. These are errors that could be corrected through Forward
Error Correction.
|
Line Rate
Upstream
|
The speed at
which the modem connected in the upstream (transmit) direction.
|
Line
Attenuation Upstream |
The
Upstream Attenuation refers to the measured power difference in the
power transmitted by the modem and the power received by the remote
end transceiver. |
SNR
Margin Upstream |
This
is the Signal to Noise Ratio, expressed as a margin, for the Upstream
(transmit) direction. You should never see a negative noise margin
with a good connection. If you do, you need to have the modem re-train.
This done by using the Reset button or re-starting the computer. |
Output
Power Upstream |
This
value, shown in decibels, is the calculated transmitted power of the
modem. The modem starts up initially with default transmit power setting
of 0 dB. This ensures that the highest amount of power will be applied.
The service provider can attenuate this value by sending messages
to the modem to lower transmit power levels. The power level can be
controlled from the DSLAM. There is no magic number here, but the
higher it is the better the connection. Somewhere between 4 and 12
is good. Factors that will effect power are the distance from the
DSLAM. |
Line
Rate Downstream |
The
speed at which the modem connected in the downstream or (receive)
direction. |
Line
Attenuation Downstream |
The
Downstream Attenuation on the ADSL signal refers to the measured power
difference in the total power transmitted by the remote end transceiver
and the power received by the modem. The network operator can adjust
the amount of attenuation to control the transmit power. |
SNR
Margin Downstream |
This
is the Signal to Noise Ratio, expressed as a margin, for the Downstream
(receive) direction. You should never see a negative noise margin
with a good connection. If you do, you need to have the modem re-train.
This done by using the Reset button or re-starting the computer. |
Output
Power Downstream |
This
value, shown in decibels, is the calculated receive power of the modem.
The modem starts up initially with default receive power setting of
0 dB. This ensures that the highest amount of power will be applied.
The service provider can attenuate this value by sending messages
to the modem to lower receive power levels. The power level can be
controlled from the DSLAM. There is no magic number here, but the
higher it is the better the connection. Somewhere between 4 and 12
is good. Factors that will effect power are the distance from the
DSLAM. |