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

+-----------------+----------------------------------------------------+
| Proposal Title: | Comments Catlin-39 and -43                         |
+-----------------+----------------------------------------------------+
| Proposal        | 02-026                                             |
| Number:         |                                                    |
+-----------------+----------------------------------------------------+
| Revision        | A                                                  |
| Number:         |                                                    |
+-----------------+----------------------------------------------------+
| Date:           | 10/19/02                                           |
+-----------------+----------------------------------------------------+
|                 |                                                    |
+-----------------+----------------------------------------------------+
| Name:           | Lee Eccles/Steve Smith                             |
+-----------------+----------------------------------------------------+
| Company:        | Boeing Commercial Airplanes/ORNL                   |
+-----------------+----------------------------------------------------+
| Phone Number:   | 206-655-2824/                                      |
+-----------------+----------------------------------------------------+
| Fax Number:     | 206-655-7724                                       |
+-----------------+----------------------------------------------------+
| Email Address:  | <Lee.h.eccles@boeing.com>                          |
+-----------------+----------------------------------------------------+
|                 |                                                    |
+-----------------+----------------------------------------------------+
| Proposal        | Initial Draft                                      |
| Status:         |                                                    |
|                 | Revised Draft                                      |
|                 |                                                    |
|                 | [X]{.underline} Ready for Vote                     |
+-----------------+----------------------------------------------------+
| Impacts:        | \_\_                                               |
|                 |                                                    |
|                 | \_\_                                               |
+-----------------+----------------------------------------------------+
| Action:         | \_[X]{.underline}\_ Approved                       |
|                 |                                                    |
|                 | \_ \_ Approved with changes                        |
|                 |                                                    |
|                 | \_ \_ Rejected                                     |
|                 |                                                    |
|                 | \_ \_ Returned for revision                        |
+-----------------+----------------------------------------------------+
|                 |                                                    |
+-----------------+----------------------------------------------------+

Background:

**Catlin-39**

8.4.6 -- Is Table 70 required or is it a normative summary. Parameters
in Table do not seem to appear anywhere in this document.

**Catlin-43**

8.5 -- There is no reference to the required input impedance of a TBIM
or TBC.

Table 70 was originally supposed to be a listing of requirements that
were taken from G.989.1 and .2. As such it is Normative.

Proposal:

### 10.4.6 Communication parameters

The following table summarizes the physical parameters required by ITU
Recommendations G.989.1 and G989.2.

Table 1---Summary of physical parameters

  ------------------------ ----------------------------------------------
  Peak-to-average power    compliant with Paragraph 5.1 of ITU
  ratio                    Recommendation G.989.1

  RF Data Channel          6 MHz
  Bandwidth                

  RF Data Input Tuning     7 MHz (fixed)
  Range                    

  RF Sync Channel          150 KHz
  Bandwidth                

  RF Sync Input Tuning     2 MHz (fixed)
  Range                    

  RF Input Return Loss     20 dB

  RF Input Impedance       100 Ω

  Spurious Emissions       see Figure 22 and Figure 23

  Signal Leakage/RFI       see Figure 22 and Figure 23

  Device Input Impedance   100 Ω
  ------------------------ ----------------------------------------------

### 10.5.5 Electrical isolation

Electrical isolation shall not be required by this standard.

Note: Due to the adoption of the HomePNA™ standard, electrical isolation
is provided for the data signals at each and all of the equipment
interfaces. However, the DC power is not necessarily isolated. To
provide complete isolation, an isolated power converter must be supplied
either in the TBIM or in a coupler. See 10.5.8 for coupler
recommendations.

Note: Good phone-line engineering practice would include the use of
components, wiring, connectors, circuit-board traces, in addition to
transient suppressor devices, designed to stand off at least 200 volts
on a short-term basis (\~ 1 sec) to reliably handle transient-voltage
events on the line. Typical HPNA magnetics (i.e., transformer/filter
modules) are rated at 1500 V standoff; typical small RF transformers are
rated to at least 250 V. Both should serve to interrupt ground loops and
provide reasonable isolation in the absence of DC power on the bus.