**I****EEE P1451.3 Proposal**

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| Proposal Title: | PSD mask changes                                   |
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| Proposal        | 2002-24                                            |
| Number:         |                                                    |
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| Revision        | C                                                  |
| Number:         |                                                    |
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| Date:           | 10/12/02                                           |
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|                 |                                                    |
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| Name:           | Lee Eccles/Steve Smith                             |
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| Company:        | Boeing Commercial Airplanes/ORNL                   |
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| Phone Number:   | \(206\) 655-2824/ 865 576-2184                     |
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| Fax Number:     | \(206\) 655-7724/ 865 576-2813                     |
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| Email Address:  | [Lee.h.eccles@boeing.com                           |
|                 | /](mailto:Lee.h.eccles@boeing.com /)               |
|                 | <smithsf@ornl.gov>                                 |
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|                 |                                                    |
+-----------------+----------------------------------------------------+
| Proposal        | Initial Draft                                      |
| Status:         |                                                    |
|                 | Revised Draft                                      |
|                 |                                                    |
|                 | Ready for Vote                                     |
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| Impacts:        | \_\_                                               |
|                 |                                                    |
|                 | \_\_                                               |
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| Action:         | \_[A]{.underline} Approved                         |
|                 |                                                    |
|                 | \_\_ Approved with changes                         |
|                 |                                                    |
|                 | \_\_ Rejected                                      |
|                 |                                                    |
|                 | \_\_ Returned for revision                         |
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|                 |                                                    |
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Background:

**Catlin-38**

Figure 22 -- Figure is difficult to understand. What is the meaning of
the dotted line, what are the levels of the plateaus & frequencies on
the X-axis, why does the Y-axis use dBm/Hz instead of dBm?

The comment here can be satisfied by duplicating the figure and table
from G989.1 in the standard for systems without synchronization. Then
for systems that use synchronization the information can be duplicated
and modified to include the sync signal.

I changed the equation between 3.5 and 4 MHz.

Proposal:

### 9.4.7 Power spectrum density (PSD) mask

The power spectral density mask limiting the output of the transmitter
in either a TBC or TBIM is specified in ITU Recommendation G.989.1 for
systems that do not use the synchronization signal. This information is
duplicated in subclause 9.4.7.1. For systems that use the
synchronization signal this standard has modified the mask as shown in
subclause 9.4.7.2.

#### 9.4.7.1 Power spectrum density (PSD) mask for TBIMs {#power-spectrum-density-psd-mask-for-tbims .unnumbered}

The acceptable power spectral density mask for a TBIM is specified in
Paragraph 5 of ITU Recommendation G.989.2 and duplicated here in 2.
Table 70 gives the PSD mask in table form.

Figure 1---PSD of TBIM transmitter output

Table 70---PSD Mask from G.989.1

  --------------------------------- -------------------------------------
  Frequency (MHz)                   PSD limit (dBm/Hz)

  0.015 \< f \< 1.7                 -140

  1.7 \< f 3.5                      -140 + (f-1.7)\*50.0/1.8

  3.5 \< f 4.0                      -90 + (f-3.5)\*8.5/0.5

  4.0 \< f \< 7.0                   -71.5

  7.0 f 7.3                         -81.5

  7.3 \< f \< 10.0                  -71.5

  10.0 f \< 13.0                    -81.5 -- (f-10)\*43.5/3.0

  13.0 f \< 25.0                    -125

  25.0 f \< 30.0                    -140
  --------------------------------- -------------------------------------

#### 9.4.7.2 Power spectrum density (PSD) mask for TBCs {#power-spectrum-density-psd-mask-for-tbcs .unnumbered}

This subclause gives the power spectral density mask for TBCs. Figure 2
shows the mask in graphical form and Table 71 duplicates the information
in table format.

Figure 2---PSD Mask for TBC Transmitters

Table 71---PSD Mask from G.989.1 Modified for the synchronization signal

  --------------------------------- -------------------------------------
  Frequency (MHz)                   PSD limit (dBm/Hz)

  0.015 \< f \< 1.0                 -140

  1.0 \< f 1.9                      -140 + (f-1.0)\*68.5/0.9

  1.9 \< f 2.1                      -71.5

  2.1 \< f 2.6                      -71.5 -- (f-2.1)\*38.5/0.5

  2.6 \< f 3.5                      -110 + (f-2.6)\*20.0/0.9

  3.5 \< f 4.0                      -90 + (f-3.5)\* 8.5/0.5

  4.0 \< f \< 7.0                   -71.5

  7.0 f 7.3                         -81.5

  7.3 \< f \< 10.0                  -71.5

  10.0 f \< 13.0                    -81.5 -- (f-10)\*43.5/3.0

  13.0 f \< 25.0                    -125

  25.0 f \< 30.0                    -140
  --------------------------------- -------------------------------------