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V Th Khnh - K s k thutBnh Dng, 12/2012
HST-3000
My o xDSL & TriplePlay
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Chng trnh o to
Tng quan v my o HST-3000- - - - - - - - - - - - - - - - - -o kim ADSL2+ v VDSL2- - - - - - - - - - - - - - - - - - - - - - -o kim IPTV- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -o kim VoIP- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -o kim Data (Ethernet, Y.1564, HTTP)- - - - - - - - - - - - - -
Go to
Go to
Go to
Go to
Go to
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Tng quan v my o HST-3000
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2008 JDSU. All rights reserved. JDSU CONFIDENTIAL & PROPRIETARY INFORMATION4
HeadsetConnector
USB Connector
Ethernet Connector
Color GUI3.8 diagonal, 1/4 VGA,Color Active Matrix with backlight(readable in direct sunlight)
Status LEDs
MicrophoneSpeaker
Handheld, Rugged & Portable Lightweight - 1.3kg Weather resistant CE Mark
Pluggable Test ModulesModular Hardware, Scalable Software
SwappableBatteryUp to 8hrs Battery Life
SerialConnector
HST-3000 Platform
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2008 JDSU. All rights reserved. JDSU CONFIDENTIAL & PROPRIETARY INFORMATION5
HST-3000 Color GUI
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HST-3000 Service Interface Modules (SIMs)
Field swappable modules: Ethernet ADSL2+ VDSL2
E1 E1 and Datacom combo DS3 and T1 combo
T1, ISDN PRI, Frame Relay WBII Copper G.SHDSL
ISDN BRI ISDN BRA
Field upgradable software:
Remote Operation MPLS Bluetooth
Wifi
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o kim ADSL2+/VDSL2 vi HST-3000
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x
D S L
igital ubscriber ine
?
ADSL(Asymmetric DSL)
HDSL
(High-bit-rate DSL)
SHDSL(Symmetric
or Single-pair HDSL)VDSL
(Very-high-speed DSL)
RDSL/R-ADSL/R-HDSL(Rate-adaptive DSL)
MDSL(Multi-rate DSL)
ADSLlite
IDSL(ISDN DSL)
UADSL(Universal ADSL)
VoDSL(Voice over DSL)
CDSL(Consumer DSL)
HDSL2
G.lite SDSL(Single-pair HDSL)
AoP (ADSL over POTS) AoI (ADSL over ISDN)
G.shdsl
G.dot
Tng quan cng ngh xDSL
ADSL2
ADSL2+
VoDSL(Video over DSL)
Annex M
RE-ADSL(Reach-Extended ADSL)
VDSL2
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ADSL : Asymmetric Digital Subscriber Line ng dng ch yu hin ti l cung cp kt ni tc cao bng rng n
ngi s dng cui cho dch v Internet v Triple Play
DMT (Discrete Multi Tone modulation) l tiu chun m ho ng dy phbin nht c s dng ITU-T G.992.1 (ex. G.dmt)
Annex A: ADSL over POTS (AoP) Annex B: ADSL over ISDN (AoI)
C 2 dng ph tn s: Overlapped v non-overlapped Cc tiu chun mi c pht trin sau ny l ADSL2 and ADSL2+
ADSL Cc nt chnh
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ADSL2 v ADSL2+
L 2 s nng cp cho tiu chun ADSLITU-T: G.992.3 (ADSL2), G.992.4 (ADSL2lite), G.992.5 (ADSL2+)C kh nng tng thch ngc vi ADSLB sung: Tng tc truyn ti H tr ch IMUX (cung cp 4 ng truyn ti cho 1 thu bao) C thm cc ch nng lng mi, gip gim nng lng tiu th v gim
nhiu xuyn m.
C thm cc tnh nng gip cho vic chn on li t ATU-R d dng hn. H tr Channelized Voice over DSL (CVoDSL) Phng thc qun l ph tn s mi, gip gim nhiu.
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256 512 2048 4096 34782782
8 kBaud 4 kBaud
# of Tones
20.5 dBm
14.5 dBm
11.5 dBm
17.5 dBm
Tx Power
Analog Bandwidth1.1 2.2 8.8 12.0 17.6 30.0
DSP Power
MHz
A DS L
A D S L2+
VDSL2 8c
VDSL2 8d
VDSL2 8a
VDSL2 8b
VDSL212a,b
VDSL217a
VDSL230a
xDSL: Nng lng v Tn s
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xDSL - M hnh mng li
Customer Premises
Central Office
Splitter Filter
ADSL modem(ATU-R)
Copper
Line
DSLAM (ATU-C)
Splitter Filter
ATM / IP Network
PC
USB
LAN
Hub/Router
IP Video
Ethernet 10/100
Corporate
Remote AccessServer
Downstream2 - 8 Mbit/s
Upstream200 - 800 kbit/s Telephony/ISDN
PSTN /ISDN Network
POTS/ISDN
ATM or GigE
Service Provider 2e.g Video on Demand
Service Provider 1e.g. Internet
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xDSL v DMT (Discrete Multi Tone)
L tiu chun m ng dy c pdng ton cu cho ADSL
Tn hiu c tri ph bng rng
Tnh nng xo trn bit (Bit swapping)tng thch vi cc vn trn ng dy.
Duy tr BER
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DMT Bit Swapping
8
15# of Bits
Tones
Start-up(No noise) After start-up(with noise)
Adaptation: BER
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xDSL Nguyn l o kim
To understand the xDSL testing needs, webreak the service up into the following
sections...
Loop Splitter
Modem(xTU-R)
ATM Data Network
Network Element
Manager
Transmission Section - TP1
PPP Authentication Section - TP3
xDSL Service Section - TP2
End to End TCP/IP Section - TP4
Central Office
DSLAM (xTU-C)
RAS Gateway
Customer Premises
Service Provider
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ATM
xTU-R Replacement DSLAM
RAS IP Routing
ISP
TE Replacement
xDSL Testing
xTU-R Modem emulation All layer Testing DSL, ATM, PPP and IP Ethernet TE & Through Modes IP ping and Trace route PPPoA, PPPoE, PAP/CHAP Bit/tone and SNR/tone graphs Internet Web-browser / FTP through-put capability
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Menu o kim xDSL
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xDSL modem emulate modeTrong ch gi lp Modem (Modem emulate mode), HST-3000 s kt cung, dy, thay th vai tr ca CPE (Customer Premise Equipment) (asFigures below)
Cc bc thc hin c bn:1. La chn ch Modem emulate mode v t cc thit lp2. Kt ni HST-3000 vo ng dy3. Tin hnh o
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xDSL modem emulate
Thit lp
DSL d l d
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Kt ni vo ng dy
xDSL modem emulate modem
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Kt qu
xDSL modem emulate modem
h ( d )
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xDSL Ch Data (Data mode)Trong ch Data (Data mode), HST-3000 s thay th ADSL Modem cakhch hng phn vng li v phn tch d liu.
Cc bc thit lp:1. La chn ch Data (Data mode) v t cc thit lp2. Kt ni HST-3000 vo ng dy3. Tin hnh o
DSL d d
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xDSL data mode
1. Nhn phm Configure
2. Chn phm mm Data, giao din thit lp Data s xut hin
La chn ch Data
+ Terminate: kt cui ng truyn.+ Through: cho php Data i qua sau khi phn tch.
DSL d d
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xDSL data mode
1. Nhn phm Configure
2. Giao din thit lp Data xut hin
Thit lp o
DSL d t d
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xDSL data mode
Thit lp Data v PPP+ IPoE/ IPoA+ PPPoE/ PPPoA+ ATM Loopback + IPoE MVC Video+ Bridged Ethernet
(used in Ethernet mode)+ ATM BERT
Setting VPI/ VCI
Customer profile:+ VPI/ VCI + User Name+ Password
xDSL data mode
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xDSL data mode
Thit lp WAN v LAN
xDSL data mode
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Telecom Test & Optimization Expert Page 27
xDSL data mode
Kt qu Data Sync
Datat ni d liu c thit lp
Data Kt ni d liu cha c thit
Ch Ethernet TE
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Ch Ethernet TETrong ch Ethernet TE, HST-3000 c th gi lp l mt tit b kt cui Ethernet (thay th PC hoc LAN). T , ngi dng c th s dng cctnh nng nh PING, Trace route, FTP, Web Browser kim tra kt ni.
Cc bc thit lp:1. La chn ch Ethernet TE.2. t cc thit lp3. Kt ni HST-3000 vo ng dy4. Thc hin bi o
Data setting PPP setting Ping setting Trace route setting LAN setting
Ch ETHERNET TE
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Ch ETHERNET TE
Kt qu
CPE Local Loop ADSL Router Internet
DHCP
Server
DHCP
Client
PING, FTP,TRACERT, Browser
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o kim IPTV vi HST-3000
Yu cu v bng thng ng vi dch v bng rng
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Yu cu v bng thng ng vi dch v bng rng
Service BWper ChannelNumber of Channels Total BW Notes
VoIP 102-128 kb/s 4 408-512 kb/s
G.711 - 64kb/s x
(1.6 2.0)(thm phn mo u)
StandardVideo (SDTV)
3 5 Mb/s
1.5 - 2.5Mb/s
3
9-15 Mb/s
4.5-7.5 Mb/s
S dng MPEG-2Encoded SDTV
(MPEG-4 Rates)
High Def Video (HDTV)
19 Mb/s
6 Mb/s1-3
19-57Mb/s
6-18Mb/s
S dng MPEG-2encoded HDTV
(MPEG-4 Rates)
High SpeedData 0.5 10 Mb/s 1 0.5-10 Mb/s
Ph thuc vo nhucu ngi dng
Yu cu v bng thng cho dch v khi cung cp dch v Triple-Play
Tng: 11 36Mb/s
VideoIPTV T l
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Core
Network (ATM, IP)
GatheringNetwork
(IP)DSLAM
TV ProgramProviders
TV ProgramBroadcaster
Transport Network (IP)
Local Loop(DSL)
TV Broadcaster (MPEG-2/IP)
CPE (Ethernet)
Cust.
MDF
VOD Platform
IP
STB ATU-R
Faulty source,PCR jitter
IP Congestion, Delay & jitter ADSL &Copper
faults
STB overflow in-house
Wiring faults
Protocol errors
Subjec Percep
Latency
IPTV Topology
25% problem50% problem
Protocol Stacks
Typical Protocol Stacks for Broadcast and VOD service
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Physical
Datalink
Network
MPEG-2 TS
Application
VOD
TCP
RTP
UDP/TCP
Transport
HT T P
MPEG-2 (H.262, H.263) MPEG-4 p10 (H.264)
R T S P
Physical
Datalink
Network
PON, Fiber, 802.11, HPNA, MoCA,
10/100/1000, ADSL, or VDSL
Ethernet
IP
MPEG-2 TS
Broadcast
UDP
RTP
Transport
UDP
IGMP
Application
MPEG-2 (H.262, H.263) MPEG-4 p10 (H.264)
Typical Protocol Stacks for Broadcast and VOD service
Vid St F t MPEG-2 TS widelyadopted !!!
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Video Stream FormatMPEG-2 Transport Stream (TS)
Defined in ISO/IEC 13818
adopted !!!
Video Content in MPEG-2
MP4 H.264compression
Same header format regardless of payload compression
Analyze the header fields (TEI, PID, Continuity Error, PCR, etc.) of the TS to determine the video quality
UDP
TS video pkt
IP RTP
Also analyze RTP and IP layer in addition to TS
Stream Layer Continuity Error
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Continuity Error
Events of Missing packets, out of sequence packets andduplicate packets cause decoding error and could have bigimpact on video quality
Continuity Error video packet loss impact to video quality
Transaction Layer IGMP d RTSP L (D l )
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ATM Network
VOD
IGMP Latency (broadcast) Time to change channelRTSP Latency (VOD) Time from movie pause to play
IGMP and RTSP Latency (Delay)
IGMP Latency (Broadcast TV Channel Change)
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y ( g )Set-top box (STB) command processing time interval between the remote control action (button push) and the transmission of
the leave / join message to the network
Network delay interval between the transmission of the leave / join messages and the arrival of the first
multicast packet of the requested channel includes multicast signaling channel transmission, IGMP processing and stream
generation time
STB layer delay time needed by the STB IP stack to process incoming packets and deliver the content to
the MPEG decoder engine may include conditional access / decryption
STB jitter buffer delay time until the STB jitter buffer reaches the fullness set point prior to the forwarding of
the video signal to the decoder function
MPEG decoder delay time required for the decoding process
100s ms
100s ms
100s ms
10-100s
1s ms
Overall Total = 700 msec, 400 msec = Network
VideoIPTV I t ll ti & M i t
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CoreNetwork (ATM, IP)
GatheringNetwork
(IP)DSLAM
TV Program
Providers
TV Program
Broadcaster
MDF
IP
STB ATU-R
- Video stream acquisition check - Video QoS check - Troubleshooting according to Video Quality Layer Model
VODPlatform
IPTV Installation & Maintenance
IPTV testing modes
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IPTV testing modes
Emulate MODEM
Emulate MODEM & STB
Emulate STB
VideoIPTV Installation & Maintenance
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CoreNetwork (ATM, IP)
GatheringNetwork
(IP)DSLAM
TV Program
Providers
TV Program
Broadcaster
MDF
IP
STB ATU-R
- Video stream acquisition check - Video QoS check - Troubleshooting according to Video Quality Layer Model
VOD Platform
IPTV Installation & Maintenance
VideoTest in Terminate Mode
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Core Network (ATM, IP)
Gathering Network
(IP) DSLAM
TV Program Providers
TV Program Broadcaster
MDF
IP
STB ATU-R
1. STB emulation2. Modem + STB emulation
VOD Platform
Test in Terminate Mode
IPTV Test in Monitor mode
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In-service Monitoring A must to troubleshoot intermittent problems
In-service monitoring
In Through mode or with HubConfirm establishment of video data path Monitor signaling Monitor Channel Change latency Monitor / Analyze IP Video QoS Monitor Multiple Channel
Test in Monitor mode
DSLAM STB
Video
Modem
HUB
In-servicemonitoring
DSLAM STB
Video In-service monitoring
Modem + thru mode
Test the Application
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Test the Application
VoIP option Verify setup and provisioning Prove connectivity to and beyond
signaling gateways Ensure call quality
IP Video option Verify IP video provisioning and content
delivery Confirm establishment of video data
path Prove IP Video QoS In-service monitoring / through mode Monitor signaling & IGMP latency
Transport Layer MDI and RTP Packet Loss Statistics
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MDI and RTP Packet Loss Statistics
Key Video QoS
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The QoS screen shows the criticalquality parameters for a video flow:
PCR jitter measures this keyparameter; if high the decoder can notproperly decode the video payload:Pass < 100 mS
Latency is the IGMP / latency , the time
to change channels for BroadcastVideo: time from IGMP request to Rxof first video packet: 0 then content problem
Video MOS
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MOS score analysis for video andaudio portions:
Video factor is like audio R-Factor showing a score built from
network elements of the factorseffecting the MOS score .
The same analysis is provided forthe audio portion of the program.
Video Bandwidth & Pkt. Analysis
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Individual bit rates are shownfor each portion of the videostream.
Unknown data defined as anydata, such as PAD bits tomaintain a constant data rate,or private IP data over MPEG,that is detected is also shown.Packet stats parameters aremeasured at the IP layer. IGMPLatency is the measure of thenetwork components to completea program change, i.e. changingthe channel in Broadcast video.
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o kim VoIP vi HST-3000
VoIP network
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Cc tham s nh hng n cht lng thoi
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Cc tham s khc:- m vng (echo), nhiu nn (background noise),- Loi ngn ng, gii tnh, mt gi.
Cc cch thc c bn nh gi cht lng VoIP
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nh gi cht lng VoIP theo ITU-T G.107 E-model
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E-model l gLoss model trong E-model?Delay model trong E-model?
E-model R-factor v MOSS tin trin ca m hnh E-model
E-model l g
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L m hnh tnh ton, c th c s dng tnh cht lng truydn 2 u thu bao VoIP.T l cht lng truyn dn chung a ra bi m hnh ny c dnchiu bi tham s R factor. R nm trong di 0-100 v c th c
nh x sang im MOS (Mean Opinion Score).c s dng cho vic quy hoch mng (network planning)v vico kim cht lng VoIP trong qu trnh s dng dch v.
Cng thc tnh E-modelR R Id I I A
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R = Ro Id Is Ie + A
Ro: gi tr R c bn (mc nhiu)Id: mc suy gim to nn tr khi giao tip (v d: m vng ca ngini/ngi nghe, tr tuyt i).Is: mc suy gim xy ra ng thi trong khi giao tip (v d: nhiu do qutrnh ly mu, mc m thoi nhn c, )Ie: mc suy gim thit b (v d: codec, packet loss, jitter)A: li (v d: 0 cho mng c dy, 10 cho mng GSM)
Loss model gn Loss vi Ie
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Delay model
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Tnh ton vi E-model
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nh x R factor (E-model) vi MOS
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S tin trin ca m hnh E-modelG 107 E model (05/2000)
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G.107 E-model (05/2000)
Da trn m hnh mt (loss model) Bernoulli, mc nh rng vic mt gi(packet loss) l ngu nhin.Mi s mt gi l c lp, khng lin quan n vic cc gi tin trc mthay khngCh c mt tham s mt t l mt gi trung bnh
S tin trin ca m hnh E-model (tip)Da trn m hnh 2 mc ca Markov hoc Gilbert
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Da trn m hnh 2 mc ca Markov hoc Gilbert.
Bao gm t l mt gi trung bnh v t l mt gi c iu kin (q i din ccm gi b mt)Chiu di cm gi mt trung bnh = 1/(1 gi tr mt lin tc) = 1/(1-q)
S tin trin ca m hnh E-model (tip)
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S tin trin ca m hnh E-model (tip)
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M hnh E-model m rng:Da trn m hnh 4 bc caMarkovThng gi tr Gmin=16 (tc l 16gi nhn c lin tip trc khigp mt li n, l gi tr mc ntrong m hnh E-model m rng).
S o Voice over IP (VoIP)
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S dng my o HST-3000nh l VoIP phone
PSTN IP or ATM Network TrunkingGateway
P B X
PSTN
SS7
PSTN
NMS
TrunkingGateway
AccessGateway
S o f t s w i t c h
AccessGateway
P B X
SS7 Gateway
Softswitch
Signaling path
Data path
Thit lp o VoIP trn my o HST-3000
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Thit lp Audio/Codec
Thit lp cc ngng nh gi
Thit lp kt ni vo mng
Thit lp Proxy
Tin hnh o VoIP trn HST-3000
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Quan st kt qu o VoIP trn HST-3000
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o kim Data vi HST-3000
HST Ethernet SIM Introduction
D l O ti l P t
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Dual Optical PortsUses swappable Small Form Pluggable (SFP) opticsOnly enabled if Optical option is purchasedSupports 1000 LX/SX/ZX as well as 100 FX/LX
Dual Electrical PortsSupports 10/100 BT as well as 1000 BTEach port has embedded sync and activity LEDs
Physical Layer Check the physical layer by verifying Optical Power and performing Cable Diagnostics
Transport Layer Perform testing of Ethernet and IP layers by
verifying throughput, frame/packet loss, packet jitter and delay SLA specifics
Application Layer Ensure high Quality of Customer Experience bytesting VoIP and Video
HST Ethernet: Test the Physical Cable
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Electrical Cable DiagnosticsQuickly check the electrical cable Is the line active? Is it a cross over or straight through? Will the switch respond to a Class 1
power request? If there is a fault (open or short), the
unit will report cable pair affected, type
of fault, and distance to faultOptical Power Level
Verify the optical signal Is the signal present? Is it within the acceptable range? Power level screen shot
HST Ethernet: Test the Transport
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Layer 2 Traffic Generation Test a switched or point-to-point network end-to-end Turn-up tests for throughput, latency, and loss
JDSU RangeExtender
1310 nm (up to 50 miles)850 nm
JDSU RangeExtender
CPECPE
850 nm
TrafficGeneration
Layer 3Loopback
HST Ethernet: Test the Transport
Layer 3 Traffic Generation
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Layer 3 Traffic Generation Test a routed or point-to-multipoint network Verify Connectivity
IP PING test (can do this today) - Count of Sent/Received Pings
Perform traceroute for verification of the path Verify Throughput (generate L3 traffic )
Bandwidth Utilization/Throughput Count of Tx/Rx packets, lost packets, checksum errors
Round-trip packet delay (layer-3loopback )
Core Routers
Edge Router Edge RouterAccess Switch Access Switch
TrafficGeneration
Layer 3Loopback
HST Ethernet: ITU-T Y.1564
ITU-T Y1564
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ITU-T Y.1564 Generate up to 8 fully independent streams Specify different VLANs, addresses, priorities for each Verifyclass of service priortization
Ethernet OC-3 / STM-1
Ethernet With different VLAN ID,Destination address,
TOS/DSCP, Frame sizeor utilization per stream
Stream 1 VLAN=10
Stream 2 VLAN=20
Stream 3 VLAN=30
Stream 4 VLAN=40
Stream 5 VLAN=50Stream 6 VLAN=60
Stream 7 VLAN=70
Stream 8 VLAN=80
Ethernet
HST Ethernet: Test the Transport
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Thru mode for in-line monitoring View live customer traffic Analyze errors Sectionalize between provider network and CPE network
HST Ethernet: Test the Transport
RFC-2544 Auto Test
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The RFC-2544 feature represents a benchmarking methodology for testing Ethernet linksHST-3000 performs four automated tests(per RFC-2544): Throughput Latency Back-to-back frame Frame LossRFC-2544 will represent a baseline for customers to verify quality of service, as defined in their Service Level Agreements.
Support RFC-2544 and Asymmetric RFC-2544with all parameters.
RFC-2544 and Asymmetric RFC-2544
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New Asymmetric RFC2544 Test
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5 Automated Tests Latency (Round trip delay) Back-to-back frames
(Asymmetric) Throughput (Asymmetric)
Frame Loss Rate (Asymmetric) Jitter (Asymmetric)
All Tests except latency aredone to a terminating tester
For latency one terminatingtester becomes a loop device
JDSU protocol between testersestablishes which is sending andwhich is receiving trafficUser selects if the upstream or downstream link is tested
Back-to-back / Throughput /Frame Loss Rate/ Jitter 10/100/1000MEthernet
10/100/1000MEthernet
Latency (Round Trip Delay)
o kim FTP/HTTP
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# FTP/HTTPURL: http://www.dantri.com.vnTransfer Count: 70656 bytesUpload Rate: 0 KbpsDownload Rate: 3949 KbpsTotal Time: 0.211 sPretransfer Time: 0.056 sName Lookup Time: 0.051 sStart Time: 0.068 sMessage: NONE
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Backup Slides
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Signal to Noise Ratio (SNR) and DMT
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Received Noise Power
Received Signal Power
Transmitted Signal Power
Frequency1.1 MHz 40 kHz
Signal to Noise Ratio (SNR)
Bits per tone
15
0
FDM (non overlapped) vsEcho Cancellation (overlapped) Spectrum
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DMT Tone Index Frequency
Downstream Non-overlapped Spectrum
P
OT S
DownstreamOverlapped Spectrum
25.875 138 Frequency [kHz] 1 104
6 32 DMT Tone Index 256
EC: Upstream and downstream bandwidths overlap,requiring the use of echo cancellation to separate channels
FDM: Divides the 1 MHz Bandwidth into 3 disjoint regions using filters
Upstream
Requires echocancellation
Fast or Interleaved Transmission Mode (1)
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Fast Interleaved
Low latency
Corrects small errors bursts
For delay sensitive,but not error ratesensitive applications
High latency
Corrects largeerror bursts
For error rate sensitive,but not delaysensitive applications
Greater Interleaving depthmeans greater latency
Explain Interleaving
Fast or Interleaved Transmission Mode (2)
Interleaving allows impulse hits to be corrected
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1 2 3 4 5 6 7 1 2 3 4 5 6 7 1 2 3 4 5 6 7 1 2 3 4 5 6 7 1 2 3 4 5 6 7 1 2 3 4 5 6 7 1 2 3 4 5 6 7 A B C D E F G
Original Coded Words
A B C D E F G
1 2 3 4 5 6 7
Interleaved Words
A B C D E F G A B C D E F G A B C D E F G A B C D E F G A B C D E F G A B C D E F G
x x x x x x x Error burst
Interleaving Depth
Resulting Words before Error Correction
1 2 3 4 5 6 7 1 2 3 4 5 6 7 1 2 3 4 5 6 7 1 2 3 4 5 6 7 1 2 3 4 5 6 7 1 2 3 4 5 6 7 1 2 3 4 5 6 7 A B C D E F G
Greater Interleaving depth means greater latency Impulse hits are spread out so that the FEC can correct
Back
Fast or Interleaved Transmission Mode (3)
Bit & ADSL ATU-C Transmitter Reference Model
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Back
V-C
Reference Points
Input
Data
NTR
OAM
Mux/ SynchControl
CRC f
CRC i
Scram& FEC
Scram& FEC
A
Mux DataFrame
Interleaver
B
FEC Output DataFrame
ToneOrdering
Bits
C
Constellation Encoder input Data Frame
Constel-lation
encoder and
gainscaling
Bits &Gains
Z i i = 1 to 255
IDFT Output
Parallel to
Serial Buffer
10
n
480
511510
DAC and analogue
processing
ATU-R transmitter: Z i = 1 to 31n = 0 to 63
Fast or Interleaved Transmission Mode (4)
ADSL Superframe Structure - ATU-C Transmitter
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Back
Frame0
Frame1
Frame2
Frame3
Frame67
Frame68
Sync Symbol . . . . . .
Superframe (17 ms)
CRC/ Syncbits
in fast
OAM bits
in fast
Frame34
Frame35 . . . . . .
OAM bits
in fast
OAM bits
in fast
Frame Data Buffer (68/69 x 0.25 ms)
Fast Data Buffer Interleaved Data Buffer
Fast Byte Fast Data FEC Redundancy Interleaved Data
1 byte RF bytes
N F bytes Points B or C
N I bytes Point C
K F bytes Point A
ADSL over POTS vs. ADSL over ISDN
ITU-T G.992.1 Annex A vs. Annex B
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ITU-T G.992.1 Annex B , AoI SDN, Non-overlapped spectrum (FDM)
US 138kHz
DS 823kHz
1 6 32 64 256 138 280 1 104
80 120
PSD
ISDN 2B1Q 4B3T
DMT Tone Index Frequency
PSD
DMT Tone Index Frequency
ITU-T G.992.1 Annex A , AoP OTS, Non-overlapped spectrum (FDM)
1 6 32 256 138 1 104
25.875
US 112kHz DS 961kHz POTS
ADSL over POTS vs. ADSL over ISDN
NEXT Issue
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US
US
DS
DS I S D N
P OT S
ADSL over ISDN
ADSL over POTS
US DS
DS I S D N
P OT S
US
ADSL over ISDN
ADSL over POTS
ADSLover
POTS
ADSLover
POTS
ADSLover
ISDN
ADSLover
ISDN
N E X T
N E X T
ExplainCrosstalk
ADSL2+ Doubles the Downstream Bandwidth
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MHz
Upstream Downstream POTS/ ISDN
0.14 1.1 2.2
ADSL2
ADSL2+
ADSL2+ Can Be Used to Reduce Crosstalk
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1.1 MHz
2.2
MHz 1.10.14
ADSL2
ADSL2+
CENTRALOFFICE
REMOTE TERMINAL
COMMON BINDER
ADSL2+ Doubles the Maximum Data Rate
30.0 ADSL2
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Loop length (km)
D a t a r a
t e ( M b i t / s )
5.0
10.0
15.0
20.0
25.0 ADSL2 ADSL2+
1.0 2.0 3.0 0.5 1.5 2.5 3.5
ADSL2 and ADSL2+
The ADSL2 and ADSL2+ standards improve on the original
ADSL by offering higher downstream data rates and longer
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Central Office
ADSL2 DSLAM
ADSL by offering higher downstream data rates and longer reach
Home Officewith ADSL2+
ADSL2 provides downstream datarates of more than 12 Mbit/s, while
extending ADSLs reach about 200m
ADSL2+ provides downstream data rates of 25 Mbit/s for loops up to 1,5 km long by
doubling the bandwidth used to carry traffic (up to 2.2 MHz)
Home Officewith ADSL2
CVoDSL vs. VoATM and VoIP
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Customer Premises Network
Baseband POTS/ISDN
xDSL Physical Layer
AAL5 AAL5
PPP PPP
IP IP
ATM ATM
AAL2 AAL2
POTS/
ISDN
VoATM
VoIP
Channelized VoDSL
CVoDSL
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kHz
Upstream Downstream POTS/ ISDN
Dedicated 64 kbit/s
PCM channel
Y!: thukhanhfc
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Skype: thukhanhfc