Quote:
Originariamente inviato da mavelot
ok quindi siamo nel campo dell'incompatibilità insomma...
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No, è specificato così da ITU... sono segnali di test, ad uso interno dei costruttori e dei provider.
Codice:
The detailed diagnostic information H(f) and QLN(f) would be most useful during Showtime. However, requesting this would place an undue computational burden on the VDSL2 modems. Thus, the combination of complete information on the channel (H(f) and QLN(f)) during initialization combined with initialization and Showtime SNR(f) is provided as a reasonable compromise. This combination of data will allow greater analysis of the loop conditions than traditional methods and will reduce interruptions to both VDSL2 and the underlying service that traditional diagnostic methods require.
The quiet line noise (QLN), signal-to-noise Ratio (SNR), and channel characteristics in format (Hlin, Hlog) shall be represented by sub-carrier group. The number of sub-carriers, G, in one sub-carrier group shall be equal to
,
where the function pow2(x) takes the nearest power of 2 greater than or equal to x and Θ is the highest sub-carrier index of the transmitter SUPPORTEDCARRIERS set if the parameter is measured during the Channel Discovery phase; or the last sub-carrier index of the transmitter MEDLEY set in other cases