sophie baron – ttc upgrade – pon concept – alice - 29 october 2012 ttc upgrade the ttc-pon...
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Sophie Baron – TTC upgrade – PON concept – ALICE - 29 October 2012 CANDIDATE FOR TTC UPGRADE Definition 3TRANSCRIPT
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TTC upgradeThe TTC-PON project
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• Defining ‘TTC upgrade’ for this talk • Upgrade Requirements • From TTC to PON• TTC-PON project• TTC for Alice - ideas
Outline
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CANDIDATE FOR TTC UPGRADEDefinition
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Generic TTC in experiment CTP
LTUTTCvi
TTCex
TTCex
TTCoc
Read Out Crate
FEBFEB
FEBFEB
FEB
…
Busy
Data
TTC
LTUTTCvi
TTCex
TTCex
TTCoc
Read Out Crate
FEBFEB
FEBFEB
FEB
…
Busy
Data
TTC
LTUTTCvi
TTCex
TTCex
TTCoc
Read Out Crate
FEBFEB
FEBFEB
FEB
…
Busy
Data
TTC
…
OFF detectorON detector
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Candidate for Versatile Link upgradeCTP
LTUTTCvi
TTCex
TTCex
TTCoc
Read Out Crate
FEBFEB
FEBFEB
FEB
…
Busy
Data
TTC
LTUTTCvi
TTCex
TTCex
TTCoc
Read Out Crate
FEBFEB
FEBFEB
FEB
…
Busy
Data
TTC
LTUTTCvi
TTCex
TTCex
TTCoc
Read Out Crate
FEBFEB
FEBFEB
FEB
…
Busy
Data
TTC
…
OFF detectorON detector
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Candidate for TTC upgradeCTP
LTUTTCvi
TTCex
TTCex
TTCoc
Read Out Crate
FEBFEB
FEBFEB
FEB
…
Busy
Data
TTC
LTUTTCvi
TTCex
TTCex
TTCoc
Read Out Crate
FEBFEB
FEBFEB
FEB
…
Busy
Data
TTC
LTUTTCvi
TTCex
TTCex
TTCoc
Read Out Crate
FEBFEB
FEBFEB
FEB
…
Busy
Data
TTC
…
OFF detectorON detector
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Candidate for TTC upgradeCTP
LTUTTCvi
TTCex
TTCex
TTCoc
Read Out Crate
FEBFEB
FEBFEB
FEB
…
Busy
Data
TTC
LTUTTCvi
TTCex
TTCex
TTCoc
Read Out Crate
FEBFEB
FEBFEB
FEB
…
Busy
Data
TTC
LTUTTCvi
TTCex
TTCex
TTCoc
Read Out Crate
FEBFEB
FEBFEB
FEB
…
Busy
Data
TTC
…
OFF detectorON detector
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TTC UPGRADERequirements
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• Bi-directionality (see next slides)• Increased bandwidth• Backward compatibility with legacy TTC system• Common system• Scalability• Partitioning flexibility
Preliminary RequirementsU
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Defined by the TTC upgrade working group in 2009-2010
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• Downstream, broadcast/unicast: – Machine Timing Signals with programmable phase, low,
deterministic and fixed latency:• Bunch Clock (40.078MHz) – low jitter required• Orbit (11.2 kHz) = BCR
– Experiments’ Synchronous Signals with low, fixed and programmable latency:• Triggers (max 40.078MHz), together with minimum 8 bits of
Trigger Type• Event Counter resets (ECR)• Calibration Pulses
– Low to medium rate Asynchronous Signals:• Slow control• Region of Interest Readout (ROI)• Event routing information (IP address?)• ...
Bi-directionalityU
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• Upstream:– Feedback and acknowledgment for control – latency controlled signals (calibration requests)– Busy/throttle signals transmitted with short and bonded
latency– Fiber latency monitoring– ...
Bi-directionalityU
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FROM TTC TO PON
What is a PON?The PON-TTC proof of concept
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The upgraded TTC should be…
• Bidirectional• Point to Multipoint• Scalable
… and requires • High bandwidth downstream for broadcast (Gbps)• Relatively lower bandwidth upstream
TTC-PON: a natural answer…
Þ typical topology of a PON system + constraints on latency and clock recovery
From
TTC
to P
ON
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PON = a mature technology
FTTH/B vs VDSL subscribers worldwide, 2011-2016, millions
Ranking of the 10 main FTTH/B players in the world, in late 2011.
FTT
H/B
Subs
crib
ers w
orld
wid
e (m
illio
ns)
Major topology of FTTH/B
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What is a PON?
OLT
ONU1
ONU2
ONU3
FTTH
FTTC
FTTB
•Passive Optical Network•Major topology of growing Access Network Market (FTTx)•Point-to-MultiPoint (P2M)•One single fibre in charge of both downstream and upstream transmissions
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What is a PON? •Downstream: 1490nm @ 1.25 Gbps
OLT
ONU1
ONU2
ONU3
FTTH
FTTC
FTTB
1 2 3 1 13 1 2 3 1 13
12
31
13
12
31
13
1 1 1
2
3 3
1490nm
Example of 1G-(E)PON
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What is a PON?•Upstream: 1310nm @ 1.25 Gbps
OLT
ONU1
ONU2
ONU3
FTTH
FTTC
FTTB
2 22
11
1
3 33
1 1 1
2 22
3 33
1310nm
2 221 1 1 3 33
Example of 1G-(E)PON
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What is a PON?•Upstream: 1310nm @ 1.25 Gbps
OLT
ONU1
ONU2
ONU3
FTTH
FTTC
FTTB
1 2 3 1 13 1 2 3 1 13
12
31
13
12
31
13
1 1 1
2
3 3
1490nm
2 22
11
1
3 33
1 1 1
2 22
3 33
1310nm
2 221 1 1 3 33
Example of 1G-(E)PON
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What is a PON?
OLT
ONU1
ONU2
ONU3
FTTH
FTTC
FTTB
1 2 3 1 13 1 2 3 1 13
12
31
13
12
31
13
1 1 1
2
3 3
1490nm
2 22
11
1
3 33
1 1 1
2 22
3 33
1310nm
2 221 1 1 3 33
Example of 1G-(E)PON
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TTC-PON proof of concept [2010]
Study conducted by I. Papakonstantinou (Aceole Fellow, now at UCL), Csaba Soos (CERN/PH/ESE) and the Opto Team of PH/ESE/BE.
And documented :•Passive Optical Networks in Particle Physics Experiments, Ioannis Papakonstantinou, 24th November 2009, PH-ESE Seminar•A Fully Bidirectional Optical Network with Latency Monitoring Capability for the Distribution of Timing-Trigger and Control Signals in High-Energy Physics Experiments
, Ioannis Papakonstantinou et al., IEEE TNS, Aug. 2011.
OLT
ONU1
ONU2
1490nm, 1.6Gbps
1310nm, 800Mbps
1 B 2 KB 1 B 2 KB1
B2
KB
1B
2
KB
1 B 2 KB 1 B 2 KB
OLT
ONU1
1 2 2
1
B 2 KB B 2 KB
1 B KB 1 B B
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TTC-PON proof of concept [2010]Fr
om T
TC to
PO
N
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TTC-PON proof of concept [2010]• Raw rate 1.6Gbit/s• Arbitrary protocol for 64 ONUs• Synchronous transmission of super-frames
with a period of 1625ns = 65*25ns at 1.6Gbit/s
• 8b/10b encoding (1Field = 1 symbol)• 590.8 Mb/s broadcast only• 9.23 Mb/s per ONU
Field Operation <K> Frame alignment and synchronization
<T> L1A trigger accept decision, real time transmission
<F> Auxiliary, to be defined in the future (could be used for upstream channel arbitration to reduce buffering capacity)
<D1>, <D2> Broadcasted/individually addressing commands (depending on first bit of D1)
<R> Upstream channel arbitration (address of the next ONU allowed to transmit upstream)
TTC individual addressing frame length = 1050ns)
Spar
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Downstream Protocol
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• Channel arbitration at the OLT (based on a simple round-robin scheme)• Slave N1 receives an R/F character with its address and switches its laser ON• IFG between successive emissions allows receiver to adapt between bursts• Long sequence of idle bytes for CDR & frame alignment• 4 bytes of payload• Total BW 800Mb/s• Latency not fixed but bonded• Optimized latencies with 1G-EPON components
– if 64 ONUs: 14 us (BW/slave=2.2Mb/s)– If 32 ONUs: 7 us (BW/slave=4.5Mb/s)– If 8 ONUs: 2 us (BW/slave=18Mb/s)– …
TTC-PON proof of concept [2010]
~300ns for high dynamic range systems (20dB)
50ns for low dynamic range (<6dB)
Spar
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Upstream Protocol
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TTC-PON proof of concept [2010]
Properties 1G-PON PROOF-OF-CONCEPT TTC LEGACY
Clock RateDistanceSplitting RatioEncoding
40 MHz100 m - 1000 mFlexible, Up to 64NRZ 8b/10b
40 MHz100 m -1000mFlexible, up to 32BPM
Bit RateWavelength
Trigger RateTrigger TypeLatency
Error DetectionError Correction
Broadcast PayloadIndividual PayloadRecovered Clock Jitter
1.6 Gb/s1490 nm
40 MHz, unconstrainedSynchronous, 8 to 32 bitsFixed and Deterministic, 10BX
1 bit (8b/10b)-
590Mbps9.2Mbps guaranteed per ONU if 64 ONUs25ps rms out of the FPGA (no extra PLL)
160 Mbps1310 nm
40MHz, but max 11 consecutiveAsynchronousFixed and Deterministic, 4BX
2 bits 1 bit (Hamming)
20Mbps7.6Mbps to be shared between Rx25ps rms out of the TTCrx (no QPLL)
Bit RateWavelength
LatencyPayloadBW Allocation
800 Mb/s1310 nm
Bonded, split ratio related. 1:8 => 2us,1:64 => 14 usSplit ratio related. 1:8 => 18 Mb/s, 1:64 => 2.2Mb/sTDMA, Fixed, Round Robin
X
Compared Performance wrt TTC legacy
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TTC-PON proof of concept [2010]
Properties 1G-PON PROOF-OF-CONCEPT TTC
Clock RateDistanceSplitting RatioEncoding
40 MHz100 m - 1000 mFlexible, Up to 64NRZ 8b/10b
40 MHz100 m -1000mFlexible, up to 32BPM
Bit RateWavelength
Trigger RateTrigger TypeLatency
Error DetectionError Correction
Broadcast PayloadIndividual PayloadRecovered Clock Jitter
1.6 Gb/s1490 nm
40 MHz, unconstrainedSynchronous, 8 to 32 bitsFixed and Deterministic, 10BX
1 bit (8b/10b)-
590Mbps9.2Mbps guaranteed per ONU if 64 ONUs25ps rms out of the FPGA (no extra PLL)
160 Mbps1310 nm
40MHz, but max 11 consecutiveAsynchronousFixed and Deterministic, 4BX
2 bits 1 bit (Hamming)
20Mbps7.6Mbps to be shared between Rx25ps rms out of the TTCrx (no QPLL)
Bit RateWavelength
LatencyPayloadBW Allocation
800 Mb/s1310 nm
Bonded, split ratio related. 1:8 => 2us,1:64 => 14 usSplit ratio related. 1:8 => 18 Mb/s, 1:64 => 2.2Mb/sTDMA, Fixed, Round Robin
X
Preliminary results based on the simple proof of concept
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THE TTC-PON PROJECT
Investigation pathsRoadmap
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• First prototype very promising• Still in the investigation phase• Many ideas to optimize this early proof-of-concept
– 1G-TDMA protocol optimization, specific TIA for OLT– 10G-TDMA
• Commercially available products for FTTx• higher payload, lower latency, TTC legacy & TTC-PON overlay?
– Other multiplexing techniques• Still prototyping stage for FTTx • Wavelength multiplexing (WDM), Orthogonal Codes (CDMA)
TTC-PON investigation paths
From 1G to 10G λ multiplexing
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• Objectives:– Explore all the paths to push the performance of the TTC-PON to its
maximum– Get as much feedback as possible from experiments
• Regular reports/demo to experiments• Specification group to validate major steps
– Install a prototype hosted by CMS trigger upgrade for evaluation (FMC based)
– Propose one or several products to experiments end of 2015• Using several PON technologies• Form factor: optical components + small reference designs + firmware IP
blocks• Crew
– TTC and PH-ESE opto team– A new doctoral student from Ioannina University (Greece)– CERN-UCL collaboration for potential WDM investigations
TTC-PON ProjectTh
e TT
C-PO
N P
roje
ct
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TTC-PON Project Roadmap20
12
2013
2014
2015
2016
2017
2018
2019
2020
LS1 LS2
TDMA investigations(using evaluation kits)
Prototyping, qualification andcommissionning of a demonstrator within CMS TTC upgrade (FMC based)
Present final prototypes @ TWEPP15
Investigation on other multiplexing schemes with UCL (CDMA, WDM)
Prototyping, pre-production
The
TTC-
PON
Pro
ject
Specification with experiments, reviews, etc
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TTC-PON FOR ALICE - IDEAS
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What PON could bring to ALICE…CTP
LTUTTCvi
TTCex
TTCex
TTCoc
Read Out Crate
FEBFEB
FEBFEB
FEB
…
Busy
Data
TTC
LTUTTCvi
TTCex
TTCex
TTCoc
Read Out Crate
FEBFEB
FEBFEB
FEB
…
Busy
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TTC
LTUTTCvi
TTCex
TTCex
TTCoc
Read Out Crate
FEBFEB
FEBFEB
FEB
…
Busy
Data
TTC
…
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This …CTP
LTU
TTCoc
Read Out Crate
FEBFEB
FEBFEB
FEB
GBT
LTU
TTCoc
Read Out Crate
FEBFEB
FEBFEB
FEB
GBT
LTUTTCvi
TTCex
TTCex
TTCoc
Read Out Crate
FEBFEB
FEBFEB
FEB
…
Busy
Data
TTC
…
OLTOLT
PON
PON
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This …CTP
LTU
TTCoc
Read Out Crate
FEBFEB
FEBFEB
FEB
GBT
LTU
TTCoc
Read Out Crate
FEBFEB
FEBFEB
FEB
GBT
LTUTTCvi
TTCex
TTCex
TTCoc
Read Out Crate
FEBFEB
FEBFEB
FEB
…
Busy
Data
TTC
…
OLTOLT
PON
PON
BusyBusyTypeCalibration RequestFeedbackGBT statusONU statusLatency measurement
L1AECRBCRTrigTypeCalibration PulseConfigurationSlow control
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Or this …CTP
LTU
TTCoc
Read Out Crate
FEBFEB
FEBFEB
FEB
GBT
LTU
TTCoc
Read Out Crate
FEBFEB
FEBFEB
FEB
GBT
LTU
TTCoc
Read Out Crate
FEBFEB
FEBFEB
FEB
…
Data
TTC
…
OLTOLT
PON
PON
PON
OLT
To be checked
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Or this …CTP
TTCoc
Read Out Crate
FEBFEB
FEBFEB
FEB
GBT
TTCoc
Read Out Crate
FEBFEB
FEBFEB
FEB
GBT
TTCoc
Read Out Crate
FEBFEB
FEBFEB
FEB
…
Data
TTC
…
OLTPO
N
PON
PON
OLT OLT…
One OLT per partition
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Or even this …CTP
TTCoc
Read Out Crate
FEBFEB
FEBFEB
FEB
GBT
Read Out Crate
FEBFEB
FEBFEB
FEB
GBT
TTCoc
Read Out Crate
FEBFEB
FEBFEB
FEB
GBT
…
OLT
PON
PON
PON
OLT…
…
One OLT per sub-detector
Software partitionning
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We are in specification stage Every feedback is most welcome!
A preliminary project description is available here
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SPARE SLIDES
38
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Generic TTC in experiments – block diagram
Det.Module
LTU
TTCex
FE driver
TTCrx
TTCrx
Det.Module
TTCrx
Det.Module
TTCrx
Det.Module
FE Controller
TTCrx
FE driver
TTCrx
Det.Module
1 10
1
16/32
Counting roomDetector
DAQDAQ
Intr
oduc
tion
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Candidate for GBT & VERSATILE LINK upgrade
Det.Module
LTU
TTCex
FE driver
TTCrx
TTCrx
Det.Module
TTCrx
Det.Module
TTCrx
Det.Module
FE Controller
TTCrx
FE driver
TTCrx
Det.Module
1 10
1
16/32
Counting roomDetector
DAQDAQ
TTC
upgr
ade
over
view
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Candidate for GBT & VERSATILE LINK upgrade
Det.Module
LTU
TTCex
FE driver
TTCrx
TTCrx
Det.Module
TTCrx
Det.Module
TTCrx
Det.Module
FE Controller
TTCrx
FE driver
TTCrx
Det.Module
1 10
1
16/32
Counting roomDetector
DAQDAQ
TTC
upgr
ade
over
view
Not the subject of this talk
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Candidate for TTC upgrade
DAQ
Det.Module
TTCrx
Det.Module
TTCrx
Det.Module
TTCrx
Det.Module
Det.Module
Counting roomDetector
DAQ
LTU
TTCex
FE driver
TTCrxFE
Controller
TTCrx
FE driver
TTCrx
1 10
1
16/32
Intr
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43TTC-PON 2010 Demonstrator Performance
CURRENT TTC AND PON-TTC DOWNSTREAM LATENCY CHARACTERISTICSPON-TTC LATENCY Current TTC LATENCY
GTX TX 75 ns TTCex 25 ns
EPON OLT TX 2.11 ns
EPON ONU RX 2.16 ns TTCrx 65-85 ns
GTX-GTP RX 137.5 ns
Total 216.8ns Total 90-110 ns
Optical Fiber 5ns/m Optical Fiber 5ns/m
Point of MeasurementRMS C2C JITTER (PS)
Ref 40MHz 3.17
Recovered 40 MHz, ONU1 Filtered 40 MHz, ONU1
36.723.6
Recovered 40 MHz, ONU2 Filtered 40 MHz, ONU2
53.123.8
Field 1G-EPON(CURRENT)
10G-EPON 2GPON 10GPON
Overlapping IFG (ns) 50 50 16 16Training (ns) 125 12.5 62.5 12.54B Payload (ns) 40 4 20 4Total per frame (ns) 215 66.5 98.5 32.5No. of bunch-cycles between transmissions 9 3 4 2
MIN UPSTREAM FRAME DURATION BREAKDOWN ANALYSIS
PON-TTC JITTER CHARACTERISTICS
Spar
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44
TTC-PON proof of concept (2010)