Home Phoneline Networking and Compatibility with xDSL and Other Services
HomePNA Spectral Environment ¡ HomePNA Specification Overview ¢ Compatibility
£ Voice Terminals (Telephones, Fax/Modems)
¤ G.lite/G.992.2
¥ G.dmt/G.992.1
¦ G.VDSL
08/06/99 DPS
xDSL Local Loop Environment and HomePNA
HomePNA G.lite POTS
ADSL
ISDN VDSL
HDSL
10 kHz 100 kHz 1 MHz 10 MHz 100 MHz
08/06/99 DPS Home Phoneline Networking and xDSL
OC-3 ATM Router
OC-3 ISP DSLAM Internet
Line POTS LLininee CCaarLdridnsse Local CCaardrdss IP over ATM PSTN PSTN over ADSL
splitter
Existing phone wire Analog VoIP New Cat 5 wire Phones Phones HomePNA G.dmt/T1.413 - 640 Kbps Up - 6 Mbps Down G.lite LAN - 384 Kbps Up xDSL - 1.5 Mbps Down Gateway/Router 08/06/99 DPS
HomePNA Overview § General
¨ Operates on same phone wire pair as telephone handsets, voiceband modems, and splitterless xDSL
© Plug and play
1.0 Mbps standard devices on the market now, 10 Mbps coming HomePNA 1.0
Disclosed portions of specifications to ITU, T1E1
Operates from 5.5 MHz to 9.5 MHz
Uses standard Ethernet 802.3 MAC
Operates at 1.0 Mbps HomePNA 2.0
Will operate at 10 Mbps, equivalent to 10baseT G.pnt (phoneline network transceiver)
International standardization has begun
VDSL - HomePNA spectral compatibility is the critical issue 08/06/99 DPS HomePNA Standardization
Home Phoneline Networking Alliance (HomePNA) was formed in 2Q98
11 founders: HP, 3COM, IBM, Lucent, Epigram/Broadcom, Tut Systems, Conexant, AMD, Compaq, AT&T Wireless, Intel
22+ Participating companies including TI
35+ Adopter companies HomePNA 1M8 1.0 Mbps
Products on market: Diamond MM, Tut Systems, AMD, Intel, …
Specification partially disclosed to external standards bodies Next generation HomePNA will support 10 Mbps
Backward compatibility
08/06/99 DPS
Relationship to OSI Model
Application Higher Layers Higher Layers
Logical Link Control Logical Link Control Presentation (LLC) (LLC)
Session Media Access Control Media Access Control (802.3 MAC) (802.3 MAC) Transport Home PNA PHY Home PNA PHY Network (1M8PHY) (1M8PHY)
Data link Wiring Physical Wire Pair network
08/06/99 DPS HomHoemPeNPAN AT rTarannssmmit MMaasskk 7 .75 .M5 hMz Hz
1.5
1
0.5
0 0.00E+00 2.00E-07 4.00E-07 6.00E-07 8.00E-07 1.00E-06 1.20E-06 -0.5
-1
-1.5
7.5 MHz, 4-cycle square wave via 5-pole Butterworth filter 5.5 MHz to 9.5 MHz Pulse position modulation at 1.0432 Mbps
08/06/99 DPS
Power Spectral Levels
Power Mode Max Min MAX MAX MAX PSD INBAND attenuation PSD PSD above 40 _PSD at > +/- 3.5 below below 1.2 MHz (dBm/Hz) MHz from 560 kHz MHz dBm/Hz carrier dBm/Hz dBm/Hz LOW_POWER -62 30 dB -140 -135 -120
HIGH_POWER -56 30 dB -140 -135 -120
08/06/99 DPS Home Phoneline Networking and Compatibility with xDSL and Other Services
! HomePNA Spectral Environment " HomePNA Specification Overview # Compatibility
$ Voice Terminals (Telephones, Fax/Modems)
% G.lite/G.992.2
& G.dmt/G.992.1
' G.VDSL
08/06/99 DPS
Spectral Compatibility
-38 dBm/Hz
-60 dBm/Hz
-62 dBm/Hz ADSL VDSL
HPNA 1.0 variable depending variable on ADSL presence
0 1.1 5.5 9.5 20 MHz
( Analyses show G.DMT/G.lite and POTS should co-exist with HomePNA; depends on system implementations ) In current VDSL proposals, HomePNA overlaps with downstream VDSL * NEXT from HomePNA into VDSL is an issue under study
08/06/99 DPS G.lite/G.992.2 Downstream Transmitter
PSD in dBm/Hz
-36.5 peak
36 dB/octave -36 dB/octave
-72 dB/octave -65 peak -44.2 peak 4.63 dB/octave -90 peak -50 dBm power in any -97.5 peak -72.5 peak +15 dBrn 1 MHz sliding window 0-4 kHz above 4545 kHz
-92.5 peak
552 2290 4545 Frequency 0 4 80 138 11040 956 in kHz 1800 3093
08/06/99 DPS
Crosstalk Models for G.lite Self-NEXT and HomePNA crosstalk into G.dmt
+ The PSD of the G.lite upstream self NEXT can be expressed as:
, 3 = 2 (1) PSDADSL−NEXT PSDADSL−Disturberxn f
- × 10−14 × ( 0.6 where xn = 8.818 n/49) or equivalently, × 10−14 × 0.6 xn = 0.8536 n for n<50.
. ( ) 2 = 2 ( ) 2 The FEXT loss model is: H FEXT f klf H channel f
/ where H_channel is the channel transfer function, k is the coupling constant and is 8 × 10-20 × (n/49)0.6 for n<50 or 3.083 × 10-20 for 10, 1% worst-case disturbers, l is the coupling path length in feet, f is in Hz. The FEXT noise PSD is therefore: 2 PSD − = PSD − H ( f ) 08/06/99 DPS ADSL FEXT ADSL Disturber FEXT G.lite Spectral Compatibility
HomePNA Spectrum
G.lite noise environment
0 HPNA devices and G.lite devices can exist on same wire pair
1 Proper design G.lite and HomePNA devices is necessary 2 08/06/99 DPS G.lite receive filter should beat minimum standards for rejection
G.lite signal after 15K ft. 26 AWG loop
08/06/99 DPS G.992.1/G.dmt Spectral Compatibility
3 HomePNA coupling from neighboring houses will have no impact on G.lite 08/06/9o9 p e DraPtSion
HomePNA - VDSL Spectral Compatibility
HPNA VDSL/ stations ADSL Modem no splitter
VDSL/ADSL VDSL/ HPNA HPNA upstream ADSL XTalk signals & downstream XTalk coupling in binder
4 Cross-talk between VDSL/ ADSL and non-splittered HPNA sharing the same binder group.
5 HPNA signal interfering with VDSL/ ADSL 6 Near End Crosstalk (NEXT) affects downstream VDSL/ ADSL 7 Far End Crosstalk (FEXT) affects upstream VDSL/ ADSL (less severe than NEXT)
8 VDSL/ ADSL signal interfering with HPNA 9 NEXT from upstream channels from nearby homes : FEXT from downstream channels (less severe than worst-case NEXT, dependent on distance from CO/Cab) 08/06/99 DPS Summary
; HomePNA will fuel need for additional bandwidth to the home. xDSL will benefit from HomePNA
< Simultaneous voice calls, VB modem, G.lite is possible using the same wire pair as Home Networking
= VDSL - HomePNA compatibility under study
> Optional isolation filter at Network Interface Device (NID) ? Splitterless ADSL @ Gateway, splitter isolate HomePNA A G.VDSL line code, upstream/downstream frequencies
08/06/99 DPS
Operation over Existing Home Wiring Test Loop #12 0
−5
−10
−15
−20
−25
Magnitude (dB) −30
−35
−40
−45
−50 0 0.5 1 1.5 2 2.5 3 7 Frequency (Hz) x 10
08/06/99 DPS