1. Access Networks Management by V5 Protocol
DB Seminar 14/12/2003 by
Yuval Levi
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2. Access Networks types Overview
Cables TV
ADSL ( Asymmetric Digital Subscriber Line )
WLL ( Wireless Local Loop )
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3. Cable Modem ArchitectureCM CM CM C M T S CM CM CM CM CM CM CM
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4. Cable Modem specifications and Evolution
DOCSIS 1.0
DOCSIS 1.1
DOCSIS 2.0
Cable Home
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5. ADSL Architecture Telephony ADSL Switch Head End ADSL modem ADSL modem
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6. WLL ( Wireless Local Loop ) SYSTEM – FH every 2mili/sec
FAU
RPU
RPCU
SWITCH
up to 10 km
DSL
E1’s
Up to 4 km
8 * 32k for US +
8 * 32k for DS
V5.2 protocol
ISDN
Control Station
Via
SNMP
Pay-phone
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7. WLL ( Wireless Local Loop ) Appoints
Developed countries
Undeveloped countries
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8. Wireless Local Loop comes to solve the last mile problem

9. Rationale for New standard
COs have grown to serve more lines.
Remotes used to decrease the cost of providing access to end customer.
These solution remain proprietary and expensive.
A need to create a flexible and scaleable solutions on an open interface.
Various digital loop carrier solutions have evolved:
- Bellcore TR008 / SLC96
- Bellcore GR303
- ETSI V5.1/V5.2
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10. V5 Switch Wireline Access Network HFC Access Network
Fixed Radio Access Network
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11. with non-proprietary interface
A network
with non-proprietary interface
V5.1/V5.2
Local Exchange
Access Network
PCM-30 (E1) AN LE
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12. Local Exchange Access Network Bearer channel bearer channel protocols
E1 link
Communication Channel
Access Network Interface
Local Exchange
Access Network
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13. SWITCHES NETWORK connected by E1’S TRUNKS
CCS
Common Channel Signaling
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14. V5.1 vs V5.2 V5.2 consists of 1 to 16 E1 I/f Single E1 interface
supports concentration, dynamic time slot assignment
Supports PSTN and ISDN BRI &PRI
protection for signaling and control channels
Maximum 3 TS for signaling / control per link
V5.1
Single E1 interface
No concentration, fixed time slot assignment
Supports PSTN and ISDN BRI
No protection
Maximum 3 TS for signaling / control LE AN LE AN
V5.1
V5.2
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15. WLL Systems – Operator’s Requirements
Transparent
Robust
Flexible
Efficient
Performance
Cost
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16. WLL – main challenges Maximum utilization of the shared channel
Concentration
Compression
QoS policy
System Control
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17. Air Interface – Frequency Hopping ( FH )
RPU_2 21 5 12 17
RPU_1 17 21 5 12
FAU 17 21 5 12
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18. WLL - Frame Structure (2 mili/sec)Rx
Broadcast Transmission
RPU
A B C D E F G H a b c d e f g h
US ( Up Stream )
DS ( Down Stream )
FAU
a b c d e f g h A B C D E F G H
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19. WLL - Slot Structure DS ( Down Stream ) US ( Up Stream ) FAU
a b c d e f g h
OOB IB
Voice / Data
Guard
Time
CRC
Control 8 64 12
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20. WLL ( Wireless Local Loop ) Shared Channel Tasks
First synchronization ( span )
Range
Channel allocation
Packets transmission
Traffic statistics
Clock recovery
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21. WLL – FAU States
Spectrum Analysis
Tracking
Active
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22. WLL - FAU ( partial ) Tasks
Trigger by
Interrupt
App. Layer
Medium Layer
1.5 Layer
Call
Processing
DMA
Int. Tx
MAC
Off-Hook
detection
S/W
Download
DLL Rx
2m/s
Int.
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23. RPU’s Synchronized
RPU_2 17 21 5 12
RPU_1 17 21 5 12
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24. Spectrum Analysis Algorithm
Stay for n+1 hops
FAU 17 X Y
Identify
RPU k
Identify
RPU n
Stay for n+1 hops
FAU X 21 Y
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25. Spectrum Analysis White Noise Probability12
Number of options for 12 CRC bits ~ 0.5
875,000 bits sampling / sec
Pr ( CRC ok for white noise per second ) = 875,000 * 1 / 4096
= 213
means – a white noise per about 5 mili / sec in average
Due to over sampling its about 1.25 mili to 2.5 mili in average
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26. Range Correlation A B C D E F G H RPU A B C D E F G H FAU_1
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27. FAU – Tracking State Tasks
Clock recovery
Battery save
Check for others RPU status
Channel Allocation ( Slotted Aloha )
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28. Alert Cycle – Channel Allocation Distributed Slotted Aloha
16 Alerts zone
Each one 6 m/sec
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29. FAU - Active state Tx / Rx Protocol for OOB channel
ACK – WEI ok
CRC ok
CRC ok N2
ACK – WEI ok
CRC ok
CRC not ok N2
ACK – WEI not ok
CRC not ok
CRC ok N2
WEI – Work Error Indication
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30. Bibliography Cable Labs site www.cablelabs.com
Bellcore, TA-NWT , Generic Criteria for Wireless Access Communication Systems ( WACS )
ETSI, EN , V5.2 interface specification
Alex Gillespie, “Access Networks”, Technology and V5 Interfacing
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31. THANK YOU
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