Home Phoneline Transport

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Home Phoneline Transport

• Koji Minami
• Tech. ManagerCopperGate Communications

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Home Phoneline Networking

• HomePNA is the industry organization developing
  specifications for home networking over phoneline
  
• Standardized by ITU SG15 Recommendations G.989.1,
  G.989.2, G.989.3

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HomePNA 2

• Delivers data, voice and video reliably today
• 16Mbps (optional 32)
• Priority based QoS supports voice, audio plus one
  video stream
• Shipping in volume (over 5M nodes deployed)
• Very low cost
• Offered by many Service Providers
• BT, SBC, Bell South, Earthlink, Bezeq,

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HomePNA 3

• Designed for multimedia
• Enables Service Providers to offer advanced
  triple play services at affordable cost
• Guaranteed and Prioritized QoS for data, multiple
  voice, audio, and high speed video streams
• Up to 128Mbps (240 optional)
• Allows user throughput of over 90 data rate
• Announced June 2003, Products available 3Q CY04

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Evolutionary and Revolutionary

• HomePNA 3 devices can be added to a HomePNA 2
  network without performance penalty
• Adaptation layer supports bridging to Ethernet,
  802.11, USB, IEEE1394 Firewire

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PHY
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HomePNA PHY

• High bit-rates and robustness
• Over problematic wiring topologies
• Immunity to impulse noise and RFI noise
• Highly adaptable to line conditions
• No training required

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Spectral Allocation

• Frequency Division Multiplexing
• Shares the spectrum with POTS, ISDN and ADSL

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HomePNA PHY

• Enhanced QAM modulation adds features to
  compensate for deep and multiple in-band nulls
• Adaptable modulation rate on a packet by packet
  basis
• Frequency Diverse QAM (FDQAM) adds 3 db system
  margin per repetition

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Adaptable Modulation

• Transmitter may vary the encoding on a packet by
  packet basis
• Modulation encodings of 2 to 8 bits per symbol
  (10 bits optional for HomePNA 3.0)
• Header always 2 bits per symbol
• Operation at multiple baud rates
• HomePNA 2 operates 2 to 4 Mbaud resulting in 4 to
  32 Mbps data rate
• HomePNA 3 operates 2 to 16 Mbaud resulting in 4
  to 240 Mbps data rate

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HomePNA Line-code
The power spectral density (PSD) envelope using
QAM has the information clustered around one
carrier frequency. Frequency-specific noise or
attenuation will degrade data throughput.
Frequency
FDQAM repeats the data two or more times at
separate frequencies. Frequency-specific noise
or attenuation is much less likely to affect all
frequencies greatly increasing robustness.
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HomePNA V3 Spectral Behavior
Each replication adds 3 db system margin over QAM
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Example of HomePNA Test Loops
Loop 20
Loop 21
Loop 24
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Maximal Rate on Test Loops
Noise margin 0dB Noise floor -140dBm/Hz
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HomePNA 3 Field Measurements

• 359 paths measured in 39 different homes located
  in the UK, France, US, and Israel
• 82 of paths gt 96 Mbps
• Average data rate is 108 Mbps

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Reach
HomePNA 3.0 reach extends to gt1000 feet at
128Mbps with optional power boost

• Test Conditions
• 24AWG wire assuming 0, 1, 5 and 10 interferers
  (disturbers)
• Noise floor -140dBm/Hz (Thermal Noise)
• Noise margin 3dB

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HomePNA also works over Coax

• Phoneline and Coax can be combined into one
  network
• Expected Line-Rate between two stations is
  determined by
• Transmission power
• Total Station to Station attenuation
• Noise floor at the receiver
• ISI

Attenuation testing results
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MAC
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HomePNA MAC

• HomePNA 2 is CSMA/CD with 802.1Q QoS
• HomePNA 3 adds Synchronous MAC mode, Guaranteed
  QoS, MAC-level packet aggregation, Collision
  Avoidance with controlled contention periods

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HomePNA 2 Frame Format

• HomePNA uses Distributed Fair Priority Queuing
  (DFPQ) to enhance collision resolution
• Does not exhibit Ethernet capture effect

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HomePNA 3 Synchronous MAC

• Media Access based on periodic MAC cycle
• MAC Cycle starts with Media Access Plan (MAP)
• Devices sync with and learn MAP before
  transmitting
• Timing references in MAP are relative to start of
  a cycle

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MAC Cycle Structure
Inter-Cycle Gap (ICG)
Inter-Cycle Gap (ICG)
Transmission Period
MAP
CONTENTION FREE TXOP
CONTENTION BASED TXOP
UNALLOCATED TXOP
IFG
IFG
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HomePNA 3
Master Controlled Peer to Peer Data Transfers
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Guaranteed QoS

• Parameter based QoS can insure premium services
  delivery
• Enables a guaranteed user experience and SLAs
• Support for numerous equal priority real time
  multimedia streams
• Efficient usage of network resources

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Guaranteed vs Relative QoS
Three CD Audio Services
Guaranteed
Relative
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Where HomePNA Fits

• Residential Gateways, SetTop Boxes, Broadband
  Modems
• Consumer Electronics (DVDs, PVRs, game consoles,
  MP3 players )
• USB and POTS adaptors
• Ethernet and 802.11 WLAN bridges
• Multimedia embedded devices

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For More Information

• info_at_homepna.org
• info_at_copper-gate.com
• CopperGate - Japan office
• 5F, Nisshin Bldg.
• 1-8-27 Konan, Minato-ku,
• Tokyo 108-8510, Japan
• Tel [phone]
• Fax [phone],