Transcript Cisco Presentation Guide

Broadband
Fixed Wireless
Bandwidth
(MHz)
Spectrum Availability
Voice,
Data, Fax,
ISDN
+ Ultra
High-Speed
LAN/WAN
+ TDM
Leased Lines
+ High Speed
Internet and
Multimedia
>100 Mbps
10 to 100
Mbps
1 to 50
Mbps
256 Kbps
20 30 200
100
200
No LOS
1 GHz 2.5
3.5
5.8
300
400 1000 1350 1400 2000
5000
LOS
10
24
26
28
38 40
MMDS
UNII
LMDS
Multichannel Multipoint
Distribution Service
Unlicensed National Information Infrastructure
Local Multipoint Distribution Service
60
2Ghz to 40Ghz
N+I_2k
© 2000, Peter Tomsu
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Spectrum Availability
Worldwide
Voice,
Data, Fax,
ISDN
+ Ultra
High-Speed
LAN/WAN
+ TDM
Leased Lines
+ High Speed
Internet and
Multimedia
>100 Mbps
10 to 100
Mbps
1 to 50
Mbps
256 Kbps
Bandwidth
20 30 200
(MHz)
100
200
No LOS
1 GHz 2.5
N+I_2k
© 2000, Peter Tomsu
3.5
5.8
300
400 1000 1350 1400 2000
5000
LOS
10
24
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26
28
38 40
60
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MMDS
• MMDS - Multichannel Multipoint
Distribution Service
• FCC regulated wireless cable system
• Delivery of multiple video signals via
point-to-multipoint microwave
transmissions
• Comprised of 33 microwave frequencies in
2.5 GHz band
N+I_2k
© 2000, Peter Tomsu
03_bb_fixed_wirel
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UNII
• UNII – Unlicensed National
Information Infrastructure
• Located in 5.2 – 5.8 GHz bands
N+I_2k
© 2000, Peter Tomsu
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LMDS
• LMDS – Local Multipoint Distribution
Service
• Located in 28 GHz and 31 GHz bands
• Broadband radio service designed to
provide two way transmission of voice,
high speed data and video
• Low powered transmitters broadcast
voice, data and video signals in
metropolitan areas
N+I_2k
© 2000, Peter Tomsu
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Spectrum: Horses for Courses
• Less than 6 GHz
Long range (up to 30 miles), Non LOS, not affected by
weather
Low-cost equipment - residential and SOHO CPE
Spectrum suitable for mass market deployments
• Greater 6 GHz
LOS, short range (1-3 miles), affected by weather, more
spectrum (1Ghz)
Spectrum used specifically for urban deployments to
Large business or Multi-tenant units
N+I_2k
© 2000, Peter Tomsu
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Reach Distance From Hub
Point-to-Multipoint
Point-to-Point Links
2.5 GHz
6 GHz
24 GHz
23 GHz
28 GHz
28 GHz
2.5 GHz
38 GHz
50.0
20.0
7.5
5.0
Reach Distance**, Km
**Assume Rain Zone K, 6cm antennae for 99.995%
average availability, vertical polarization.
N+I_2k
© 2000, Peter Tomsu
3.57
5.34
6.92
40
Reach Distance*, Km
*Assume Rain Zone K, Single Channel per Transmitter,
same power, same dB gain antennaes for all frequencies.
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P2P vs P2MP
P2P
dedicated
bandwidth
P2MP Sector
P2MP
shared
bandwidth
N+I_2k
© 2000, Peter Tomsu
03_bb_fixed_wirel
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Cost per Subscriber by
Network
This is the point at
which PMP becomes more
economically viable than
a PTP network, generally ~8 links.
PTP
PMP
CPE Cost
# of Subscribers
N+I_2k
© 2000, Peter Tomsu
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Unified Broadband Wireless
Reference Architecture
Industry
Suppliers
FCC Compliant R.F.
Standard I.F.
IP
ATM
WDM
FR
Integrated
Wireless MAC
SAT
38SAT
GHZ
Radio
38 GHZ
Radio
38 GHZ
Radio
LMDS
Radio
LMDS
Radio
UNII
Radio
UNII
Radio
MMDS
Radio
MMDS
Radio
10 GHZ
Radio
10 GHZ
Radio
Other Any RF band
Backhaul
Network
N+I_2k
Wireless
Service
Modules
Other
End-to-End Services, Network Management,
Provisioning AND Billing
© 2000, Peter Tomsu
03_bb_fixed_wirel
Small Office
PBX
Branch
Office
SOHO
Telecommuter
Consumer
CPE
Networks
11
Key Features
• IP Packet Based Solution with DOCSIS 1.1 support
• Up to 44.4 Mbps full-duplex throughput
• Up to 25 Miles in connection distance
• Fiber quality link
> 10-11 BER for Data, > 10-8 BER for Voice
• Supports both MMDS (2.5 GHz) and UNNI (5.7 GHz)
• Encryption support: 56 bit DES with RSA key
management
N+I_2k
© 2000, Peter Tomsu
03_bb_fixed_wirel
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The Problem
“
Line-of-Sight:
The technology, while promising, continues to have nagging "line-ofsight" issues. Wireless signals in these systems must have a clear path
to travel as they bounce from rooftop to rooftop. Trees, buildings and
even inclement weather, such as snow and pelting rain, can cause
static, dropped calls and hazy connections.
Leslie Cauley
staff reporter in The Wall Street Journal's New York bureau
September 20, 1999
N+I_2k
© 2000, Peter Tomsu
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”
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The Solution
• VOFDM (Vector Orthogonal
Frequency Division
Multiplexing) technology
Paths
• employs both frequency and
spatial diversity
…
• creates a robust processing
technique for multipath
fading and narrow band
interference
• VOFDM enables greater
coverage
…
Base
Station
Subscriber
• substantially reduces LOS
limitations
N+I_2k
© 2000, Peter Tomsu
03_bb_fixed_wirel
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What is VOFDM?
Transmit Spectrum
• Each VOFDM burst carries
data and training
Allows for variation in
the channel
Reduces effect of
frequency offset
Receive Spectrum
• VOFDM, interleaving
and coding
Create a robust processing
technique for multipath
fading and narrow band
interference
Channel Training Tone
Data Tone
N+I_2k
© 2000, Peter Tomsu
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Questions ???