архив прош.сесий / архив прош.сесий / sinkhr_v_paket_setyakh
.pdf
Упрощенная модель G.8265.1
Модель Master/Slave для IEEE1588-2008 End2End
Telecom
Grandmaster
PTP communication path
(IP source – IP dest. pair)
Telecom
Slave Unicast Negotiation Request messages
clockClass value (mapped to QL)
PTP port in master state
PTP port in slave state
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Frequency recovery from |
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Select Packet |
PTPEvent messages |
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Master based on |
Track PTSF |
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clockClass(QL) |
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Announce, Sync and |
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and local priority |
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Delay_Resp flow |
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© 2012 Cisco and/or its affiliates. All rights reserved. |
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51 |
Процесс выбора источника синронизации 
Параметры, используемые в процессе выбора источника синхронизации:
‒Quality Level (параметр clockClass)
‒PacketTiming Signal
‒Priority
Использование существующих подходов синхронных сетей SONET/SDH/SyncE
PHY-layer Timing Chain Control (G.781)
SynchronousEquipment Timing Source (SETS)
PTP 
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Новый Telecom Profile: ITU-T G.
Передача фазы/времени
В процессе создания!!
Вся сеть с поддержкой IEEE1588/PTP
Модель распространения Hop-by-hop: цепочка Telecom BCs (T-BCs)
Рекомендован гибридный режим – передача частоты на физическом уровне
‒T-TSC and T-BC syntonization and holdover
Форматы: Ethernet (confirmed),IP (to be discussed)
Транспорт: Layer 2 multicast (confirmed), IP (to be discussed)
Режим: two-way only, oneand two-step
BMCA: TBD
‒Master and Slave Port State again static on T-TSC and T-GM as in G.8265.1
Границы возможностей модели и отдельных узлов: TBD
‒G.827x Specifications (work in progress)
T-TSC … Telecom Time Slave Clock T-BC … Telecom Boundary Clock
T-GM … Telecom Grand Master
© 2012 Cisco and/or its affiliates. All rights reserved. |
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53 |
Рекомендации ITU-T. Оценка PDV.
G.8261 – Аспекты синхронизации в пакетных сетях
Packet Timing Flow
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© 2012 Cisco and/or its affiliates. All rights reserved. |
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Эмуляция нагрузки
G.8261 – Аспекты синхронизации в пакетных сетях
Appendix VI.5 – Test for Two Way Protocols
BaselineTest (no Network Master/Slave back to back)
Performance Tests (Network & Load)
Test Case |
Description |
12 |
80% |
Static PacketLoad |
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20% |
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80% |
13 |
Suddenlarge and persistent Load Changes |
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10% |
14 |
Slow Load Change overextremely long Time |
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20% |
15TemporaryNetwork Outage
16TemporaryCongestion
17Routing Changescaused by failures
MasterSlave
SlaveMaster
Network Load
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1h |
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50% |
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20% |
3h |
6h |
80% |
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55% |
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12h |
24h |
© 2012 Cisco and/or its affiliates. All rights reserved. |
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55 |
G.8261 – пример результата тестов
OC Slave, MWR2941, Cisco IOS 15.1(1)MR, 10 hops
Frequency - TIE |
Frequency – MTIE/TDEV |
Network Load
MasterSlave 80% 
SlaveMaster
20% |
OC … Ordinary Clock |
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1h |
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© 2012 Cisco and/or its affiliates. All rights reserved. |
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56 |
SyncE + End2End IEEE1588
Эволюция мобильных 2G и 3G RAN сетей
BTS/NodeB |
RAN Traffic |
Traffic Sync
BSC/RNC |
SSU |
Frequency |
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Reference |
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Traffic |
Sync |
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OC3/STM1 |
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OC12/STM4 |
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OC48/STM16 |
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SONET/SDH/ATM |
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SONET/SDH/ATM |
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SONET/SDH/ATM |
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Access |
Aggregation |
Core |
BTS … BaseTransceiverStation; BSC … Base Station Controller
© 2012 Cisco and/or its affiliates. All rights reserved. |
CiscoPublic |
57 |
SyncE + End2End IEEE1588
Эволюция мобильных 2G и 3G RAN сетей
Traffic Traffic
BTS/NodeB |
RAN Traffic |
BSC/RNC |
SSU |
Frequency |
Sync |
Reference |
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Sync
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OC3/STM1 |
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OC12/STM4 |
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OC48/STM16 |
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SONET/SDH/ATM |
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SONET/SDH/ATM |
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SONET/SDH/ATM |
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Access |
Aggregation |
Core |
BTS … BaseTransceiverStation; BSC … Base Station Controller
© 2012 Cisco and/or its affiliates. All rights reserved. |
CiscoPublic |
58 |
SyncE + End2End IEEE1588
Эволюция мобильных 2G и 3G RAN сетей
Traffic Traffic Sync
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SSU |
Frequency |
BTS/NodeB |
RAN Traffic |
BSC/RNC |
Reference |
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Sync |
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Sync |
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OC3/STM1 |
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SONET/SDH/ATM |
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SONET/SDH/ATM |
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Access |
Aggregation |
Core |
BTS … BaseTransceiverStation; BSC … Base Station Controller
© 2012 Cisco and/or its affiliates. All rights reserved. |
CiscoPublic |
59 |
SyncE + End2End IEEE1588
Эволюция мобильных 2G и 3G RAN сетей
|
IEEE 1588-2008(PTP) |
GM |
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CarrierE/IP/MPLS |
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CarrierE/IP/MPLS |
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IEEE 1588-2008(PTP) |
GM |
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SL |
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Traffic Sync |
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Traffic Sync |
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BTS/NodeB |
RAN Traffic |
BSC/RNC |
SSU |
Frequency |
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Reference |
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Access |
Aggregation |
Core |
BTS … BaseTransceiverStation; BSC … Base Station Controller
© 2012 Cisco and/or its affiliates. All rights reserved. |
CiscoPublic |
60 |