10.7. Technology-Specific Guidelines

In addition to the technology-independent SM classes described, the SM standard T1.417 also contains technology-specific guidelines. In the first issue of T1.417, there is one specific underlying technology, namely, pulse amplitude modulation; however, there are three distinct families of technology specific guidelines. The technology specific guidelines include 2B1Q-based SDSL, PAM per G.991.2 Annex A, and PAM per HDSL4 using 776/784 kb/s asymmetric PSDS.

Table 10.10. Spectrum Management Class 9 Upstream Template Definition
Frequency Band (kHz)PSD (dBm/Hz)
0 < f < 4−101, with max power in the in 0–4 kHz bands of + 15 dBm
4 < f < 25.875−96 + 21.5 × log2(f/4)
25.875 < f < 138−38
138 < f < 307−38 −48 × log2(f/138) ...

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