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.
| 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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