Copper Line Troubleshooting Troubleshooting
Troubleshooting link with BBA
BBA Amplifier auto tunes to link topology and thus its amplification on Downstream and
Upstream directions varies with topology and with spectral regulations (in case of SC type
BBA).
BBA is an unmanaged device and its characteristics may be evaluated via the ML unit.
BBA link additional parameters
The following parameters may assist in understanding the topology and the BBA
amplification parameters
Table 93: Parameters in link with BBA
EWL parameter is available in case of regular link without BBA and in case of link with
BBA.
EWL value may be calculated if overall span loop length is known and cable type is
known (for details refer to the Table 78: HSL Details). In case of BBA the difference
between calculated EWL and the EWL that the system provides is the BBA gain.
Downstream Insertion Loss (measured at 300kHz) is provided only in case of link with
BBA.
The measured attenuation is composed of the two segments attenuation (ML700-O to
BBA and BBA to ML700-R) minus BBA’s gains.
Link Insertion Loss may be calculated if overall span loop length is known and cable type
is known. In case of BBA the difference between calculated Insertion Loss and the
Insertion Loss that the system provides is the BBA gain.
Upstream Insertion Loss (measured at 100kHz) is provided only in case of link with BBA.
The measured attenuation is composed of the two segments attenuation (ML700-O to
BBA and BBA to ML700-R) minus BBA’s gains.
Link Insertion Loss may be calculated if overall span loop length is known and cable type
is known. In case of BBA the difference between calculated Insertion Loss and the
Insertion Loss that the system provides is the BBA gain.
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