Test/DELT SNR Test Result Help

Upstream

SNR Test Results

Tone

Tone index. In the range of 0 to 511. 0 indicates 4.3125 kHz Tone Freq, 1 indicates 8.625 kHz, ..., 511 indicates 2208.0000 kHz.

Frequency (kHz)

Tone frequency. Tone Freq = (Tone Index +1) x 4.3125 kHz..

Attenuation (dB)

An listing of up to 512 real H(f) logarithmic representation values in dB for the respective transmission direction. It supports up to 512 (downstream) sub-carriers. The number of utilized values for a direction (downstream or upstream) depends on the number of sub-carriers defined for that direction (NSCds or NSCus). Each row in the table contains a pair of Hlog(f = i*Df) values for a particular sub-carrier index. The real Hlog(f) value has a range of -96.3 to 6.0 dB. "no data" indicates that no measurement could be done for the sub- carrier because it is out of the passband or that the attenuation is out of range to be represented.

Noise (dBm/Hz)

An listing of up to 512 real Quiet Line Noise values in dBm/Hz for the respective transmission direction. Like Attenuation, it supports up to 512 (downstream) sub-carriers. Each row in the table contains a pair of QLN(f= i*Df) value values for a particular sub-carrier index. The QLN(f) value has a range of -150.0 to -23.0 dBm/Hz. "no data" indicates that no measurement could be done for the sub-carrier because it is out of the passband or that the noise PSD is out of range to be represented.

SNR (dB)

This is the SNR Margin per sub-carrier, expressing the ratio between the received signal power and received noise power per subscriber. It is a listing of 512 values. Like Attenuation, it supports up to 512 (downstream) sub-carriers. The SNR value has a range of -32 to 95 dB. "no data" indicates that no measurement could be done for the sub- carrier, probably because it is out of the PSD mask passband or that the noise PSD is out of range to be represented.

 

Downstream

SNR Test Results

Tone

Tone index. In the range of 0 to 511. 0 indicates 4.3125 kHz Tone Freq, 1 indicates 8.625 kHz, ..., 511 indicates 2208.0000 kHz.

Frequency (kHz)

Tone frequency. Tone Freq = (Tone Index +1) x 4.3125 kHz..

Attenuation (dB)

An listing of up to 512 real H(f) logarithmic representation values in dB for the respective transmission direction. It supports up to 512 (downstream) sub-carriers. The number of utilized values for a direction (downstream or upstream) depends on the number of sub-carriers defined for that direction (NSCds or NSCus). Each row in the table contains a pair of Hlog(f = i*Df) values for a particular sub-carrier index. The real Hlog(f) value has a range of -96.3 to 6.0 dB. "no data" indicates that no measurement could be done for the sub- carrier because it is out of the passband or that the attenuation is out of range to be represented.

Noise (dBm/Hz)

An listing of up to 512 real Quiet Line Noise values in dBm/Hz for the respective transmission direction. Like Attenuation, it supports up to 512 (downstream) sub-carriers. Each row in the table contains a pair of QLN(f= i*Df) value values for a particular sub-carrier index. The QLN(f) value has a range of -150.0 to -23.0 dBm/Hz. "no data" indicates that no measurement could be done for the sub-carrier because it is out of the passband or that the noise PSD is out of range to be represented.

SNR (dB)

This is the SNR Margin per sub-carrier, expressing the ratio between the received signal power and received noise power per subscriber. It is a listing of 512 values. Like Attenuation, it supports up to 512 (downstream) sub-carriers. The SNR value has a range of -32 to 95 dB. "no data" indicates that no measurement could be done for the sub- carrier, probably because it is out of the PSD mask passband or that the noise PSD is out of range to be represented.

May 11, 2011