Nir Laufer , Director Product Line Management WSTS 2015
Phase Delivery over PTP Unaware Networks
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Phase Delivery Challenges in Brownfield Deployments • Existing network introduce high level of asymmetry and PDV • The asymmetry and PDV varies over time • Existing networks include different transport technologies • Upgrading/forklifting the existing NE to Sync-E/BC is very costly
Do we really need frequency and phase in the core network?
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Bypass the problem: Get the Grand Master closer to the Slave
Core/Mobile Backhaul Provider
Mobile Network Operator
High PDV/ Asymmetry
PTP Slave Clock
Slave
4G Base Station /
Small Cell
Grand Master
GNSS
The Solution
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Grand Master
GNSS
Core/Mobile Backhaul Provider
Mobile Network Operator
High PDV/ Asymmetry
PTP Slave Clock
Slave
4G Base Station /
Small Cell
Packet-Based Backhaul Network
Grand Master
GNSS
Bypass the problem: Get the Grand Master closer to the Slave
The Solution
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Phase Delivery: Small Scale GM & G.8275.1 – Last Mile
• G.8275.1 – Uses hop by hop , Ethernet multicast
mini-GM
Local Macro Base Station
GNSS
T-SC
Core/Mobile Backhaul Provider
Mobile Network Operator
High PDV/ Asymmetry
Packet-Based Backhaul Network
PTP Slave Clock
Slave
Each network element needs to be PTP-aware (T-BC) with Sync-E
BC & Sync-E
BC & Sync-E
BC & Sync-E
4G Base Station /
Small Cell
16ppb & +/-1.1us
Ethernet Multicast
G.8275.1
Last mile full on path support Small Scale GM as a head of G.8275.1 chain
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Phase Delivery: Small Scale GM & G.8275.2 – Last Mile
• G.8275.2 – Uses IP unicast for phase delivery over last mile
mini-GM
Local Macro Base Station
GNSS
T-SC
Core/Mobile Backhaul Provider
Mobile Network Operator
High PDV/ Asymmetry
Packet-Based Backhaul Network
PTP Slave Clock
Slave
4G Base Station /
Small Cell
16ppb & +/-1.1us G.8275.2
Small Scale GM as a head of G.8275.2 chain
? Slave
Slave
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PDV of a single NE • Single congestion point
Two types of traffic loads have been considered: • Case A: The size of the data traffic packets was variable,
from 64 bytes to 1518 bytes • Case B: All the data traffic packets have a 1518 bytes fixed
size
Source - France Télécom Orange
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PDV of a single NE – Case A 1Gbps, variable size data traffic:
Source - France Télécom Orange
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PDV of a single NE – Case B 1Gbps, 1518 bytes data traffic: :
Source - France Télécom Orange
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Setup #1
Tester
Traffic Analyzer
DUT #1 DUT #2
PTP f low
Disturbance traff ic
PTP GM PTP TS & Probe
Clk+1pps pps
Reference PRTC
GPS splitter
pps Traffic Generator
Congestion point
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Test 1: G.8261 Traffic model #1
• Single Congestion , VLAN Priority • PTP - 64 packets per second (on both directions) • Single congestion point (on forward) • Forward load traffic (no load on reverse direction)
• 80% -minimum size packets (64 octets) • 15% - maximum size packets (1518 octets) • 5% - medium size packets (576 octets)
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Test #1 - Forward Packet TIE (Tester)
100% 90% 80% 70% 60% 50% 40% 30% 20% 10%
1400
0
2000
0 TI
E (n
sec)
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Test #1 - Forward Filtered Packet TIE (Tester)
• Window size – 200 sec , band 0.3%
100% 90% 80% 70% 60% 50% 40% 30% 20% 10%
800
400
TIE
(nse
c)
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Test #1 - Forward & Reverse Filtered Packet TIE (Tester) • Window size – 200 sec , 0.3%
100% 90% 80% 70% 60% 50% 40% 30% 20% 10%
800
400
TIE
(nse
c)
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Test #1 – Probe Measured Forward Delay • Window size – 5sec , Lucky packet
10%-100% 100%-10%
2526
5 TE
(nse
c)
2650
5
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Test #1 – Probe Measured Reverse Delay • Window size – 5sec , Lucky packet
10%-100% (Fr) 100%-10% (Fr)
2530
8 TE
(nse
c)
2561
2
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Test #1 – Probe Measured Asymmetry • Window size – 5sec , Lucky packet
10%-100% 100%-10%
-370
TE
(nse
c)
296
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Test #1 – 1PPS TE (Tester) • Time Error within +/- 150nsec – well within +/- 1100nsec
-150
10
0 TE
(nse
c)
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Test #1 – 1PPS TE Probe Vs ref PRTC • Time Error within +/- 150nsec – well within +/- 1100nsec
-196
TE
(nse
c)
56
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Test #1 – 1PPS MTIE (Tester) • MTIE well under G.8271.1 network limits mask
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Test #1 – 1PPS MTIE Probe Vs Ref PRTC • MTIE well under G.823 pdh mask
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• Single Congestion , VLAN Priority • PTP - 64 packets per second (on both directions) • Single congestion point (on forward) • Forward load traffic (no load on reverse direction)
• 30% -minimum size packets (64 octets) • 60% - maximum size packets (1518 octets) • 10% - medium size packets (576 octets)
Test 2: G.8261 Traffic model #2
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Test #2 - Forward Packet TIE (Tester)
100% 90% 80% 70% 60% 50% 40% 30% 20% 10%
1500
0 20
000
TIE
(nse
c)
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Test #2 - Forward Filtered Packet TIE (Tester)
• Window size – 200 sec , band 0.3%
100% 90% 80% 70% 60% 50% 40% 30% 20% 10%
700
800
TIE
(nse
c)
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Test #2 - Forward & Reverse Filtered Packet TIE (Tester) • Window size – 200 sec , 0.3%
100% 90% 80% 70% 60% 50% 40% 30% 20% 10%
630
720
TIE
(nse
c)
360
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Test #2 – 1PPS TE (Tester) • Time Error within +/- 200nsec – well within +/- 1100nsec
60
TE (n
sec)
-1
80
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Test #2 – 1PPS MTIE (Tester) • MTIE well under G.8271.1 network limits mask
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Setup #2
Tester
Traffic Analyzer
DUT #1 DUT #2
PTP f low
Disturbance traff ic
PTP GM PTP TS & Probe
Clk+1pps
pps
Reference PRTC
GPS splitter
pps Traffic Generator
Congestion point
DUT #3
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Test 3: G.8261 Traffic model #1
• Two Congestion points , VLAN Priority • PTP - 64 packets per second (on both directions) • Single congestion point (on forward) • Forward load traffic (no load on reverse direction)
• 60% -minimum size packets (64 octets) • 15% - maximum size packets (1518 octets) • 5% - medium size packets (576 octets)
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Test #3 - Forward Packet TIE (Tester)
100% 90% 80% 70% 60% 50% 40% 30% 20% 10%
0 60
000
TIE
(nse
c)
2000
0
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Test #3 - Forward Filtered Packet TIE (Tester)
• Window size – 200 sec , band 0.3%
100% 90% 80% 70% 60% 50% 40% 30% 20% 10%
0 12
000
TIE
(nse
c)
6000
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Test #3 - Forward & Reverse Filtered Packet TIE (Tester) • Window size – 200 sec , 0.3%
100% 90% 80% 70% 60% 50% 40% 30% 20% 10%
2000
12
000
TIE
(nse
c) 80
00
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Test #3 – 1PPS TE (Tester)
• Time Error within +/- 250nsec – well within +/- 1100nsec
-60
240
TE(n
sec)
60
00
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Test #3 – 1PPS MTIE (Tester) • MTIE well under G.8271.1 network limits mask
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Test 4: G.8261 Traffic model #2
• Two Congestion points , VLAN Priority • PTP - 64 packets per second (on both directions) • Single congestion point (on forward) • Forward load traffic (no load on reverse direction)
• 30% -minimum size packets (64 octets) • 60% - maximum size packets (1518 octets) • 10% - medium size packets (576 octets)
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Test #4 - Forward Packet TIE (Tester)
100% 90% 80% 70% 60% 50% 40% 30% 20% 10%
0 80
000
TIE
(nse
c)
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Test #4 - Forward Filtered Packet TIE (Tester)
• Window size – 200 sec , band 0.3%
100% 90% 80% 70% 60% 50% 40% 30% 20% 10%
800
4000
TI
E (n
sec)
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Test #4 - Forward & Reverse Filtered Packet TIE (Tester) • Window size – 200 sec , 0.3%
100% 90% 80% 70% 60% 50% 40% 30% 20% 10%
700
1500
TI
E (n
sec)
0
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Test #4 – 1PPS TE (Tester)
• Time Error within +/- 270nsec – well within +/- 1100nsec
-270
18
0 TE
(nse
c)
0
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Test #4 – 1PPS MTIE (Tester) • MTIE well under G.8271.1 network limits mask
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• Single Congestion , VLAN Priority • PTP - 64 packets per second (on both directions) • Single congestion point (on forward) • Forward load traffic (no load on reverse direction)
• 10% -minimum size packets (64 octets) • 80% - maximum size packets (1518 octets) • 10% - medium size packets (576 octets)
Test 5: Traffic model #3
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Test #5 - Forward Packet TIE (Tester)
100% 90% 80% 70% 60% 50% 40% 30% 20% 10%
0 80
000
TIE
(nse
c)
© 2014 ADVA Optical Networking. All rights reserved. Confidential. 43
Test #5 - Forward Filtered Packet TIE (Tester)
• Window size – 200 sec , band 0.3%
100% 90% 80% 70% 60% 50% 40% 30% 20% 10%
0 50
00
TIE
(nse
c)
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Other Access Technologies • WDM/GPON/DSLAM/MW tend to include high level of PDV &
Asymmetry • In most cases would require on path support (BC/TC) in order to
deliver accurate phase
• ITU-T standards not available but proprietary solution are offered by the vendors
mini-GM
GNSS
Core/Mobile Backhaul Provider
Mobile Network Operator
High PDV/ Asymmetry
Slave
MW+TC
Slave
Slave
BC/TC
© 2014 ADVA Optical Networking. All rights reserved. Confidential. 45
Phase Delivery over PTP unaware networks • Phase delivery over PTP unaware Ethernet (L2) network elements is possible with the following network engineering guidelines:
• Use QoS to priorities PTP packets • Avoid speed mismatch (or compensated for known asymmetry generated by the mismatch)
• Test your access network elements PDV and asymmetry under realistic load scenario
• Avoid network traffic unitization above 90% • If needed , use PTP aware network element for access technologies (MW/WDM/DSLAM/GPON)
Questions? Thank you!
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