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ClearSight Networks CONFIDENTIAL1
Troubleshooting IPTV Using The Clearsight
Network Analyzer
ClearSight Networks, Inc.
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ClearSight Networks CONFIDENTIAL2
The Presenter
• Mike Pennacchi• – Owner Network Protocol
, Specia lis ts LLC• 10 years profess iona lly
troubleshooting ne tworks• 9 Ins tructor a t Inte rOp for
years• Use the ClearSight Analyzer
as part of our consultingbus iness
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ClearSight Networks CONFIDENTIAL3
Agenda
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ClearSight Networks CONFIDENTIAL4
Troubleshooting Video Networks
Video Troubleshooting
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ClearSight Networks CONFIDENTIAL5
Video Traffic Analysis
• Measuring Video Quality– Streaming methods–CODECs– Impact of impairments–VQFactor
• IPTV and Multicas t Technologies– IP Multicas ting– Channe l Zapping
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ClearSight Networks CONFIDENTIAL6
Video Traffic Analysis
• Streaming Methods–Reliable• Transmiss ion Control Protocol• Works well for Video on Demand• Miss ing frames are re transmitted• Viewer crea tes the ir own connection to the
video server• Bandwidth intens ive• Good video quality
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ClearSight Networks CONFIDENTIAL7
Video Traffic Analysis
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ClearSight Networks CONFIDENTIAL8
Video Traffic Analysis
• Streaming Methods–Unre liable• User Datagram Protocol• No re transmiss ions• Works for both Video on Demand and Livevideo• Packet loss and J itte r result in degraded
video quality• , One s tream per viewer bandwidthintens ive
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ClearSight Networks CONFIDENTIAL9
Video Traffic Analysis
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ClearSight Networks CONFIDENTIAL10
Video Traffic Analysis
• Streaming Methods–Multicas t• User Datagram Protocol• No re transmiss ions• Works for Live video• Packet loss and J itte r result in degraded
video quality• , One s tream for a ll viewers conservesbandwidth
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ClearSight Networks CONFIDENTIAL11
Video Traffic Analysis
• CODECs– Respons ible for Encoding and
Decoding the video s tream– CODEC used de te rmines the about of
.bandwidth for each s tream– CODEC also de te rmines the sens itivity
to J itte r and Packe t Loss
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ClearSight Networks CONFIDENTIAL12
Video Traffic Analysis
• Supported CODECs– .264 ( , , )H Base line Main Extend– 2- ( : 14)MPEG TS payload type– 2 ( : 33)MPEG layer II payload type– 4MPEG– ( ASF Windows Media Advanced Sys tem
)format– ( )iLBC interne t Low Bit Ra te Codec– (411, 422, 111)JPEG– .263 ( )H Mode A and Mode B
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ClearSight Networks CONFIDENTIAL13
Video Traffic Analysis
• Streaming Protocols– ( )Realtime Streaming Protocol RTSP• Respons ible for se tting up the s tream• Conta ins commands and responses
– ( )Realtime Protocol RTP• Header for the da ta frames• Conta ins sequence numbers and
times tamps to he lp de te rmine frame loss and jitte r
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ClearSight Networks CONFIDENTIAL14
Video Traffic Analysis
• RTP and RTSP
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ClearSight Networks CONFIDENTIAL15
Video Traffic Analysis
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ClearSight Networks CONFIDENTIAL16
Video QoS measurement
• VQFactor– 6.0Supported in ClearSight– Resulting metrics a re represented as
/ - current CSAMOS R Value s ta ts– Displayed in QoS Report– Quality re la ted a la rms are supported to
a le rt when degrada tion occurs
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ClearSight Networks CONFIDENTIAL17
VQFactor Stats
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ClearSight Networks CONFIDENTIAL18
MPEG Statistics
• MPEG Sta ts– Three Types of Frames• – – I Frames Conta in the entire screenimage• – – P Frames Predicted from pas t I or Pframes• – – B Frames Predicted from pas t and
future I or P frames
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ClearSight Networks CONFIDENTIAL19
MPEG Statistics
I-Frame Stat
P-Frame Stat
B-Frame Stat
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ClearSight Networks CONFIDENTIAL20
Video quality alarms
• Alarms– Alarms can be configured to trigger on
multiple impairments• J itte r• Packet Loss• MOS Score– , Based on configured severity the
appropria te action will be taken• -E Mail• SNMP Trap
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ClearSight Networks CONFIDENTIAL21
Video quality alarms
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ClearSight Networks CONFIDENTIAL22
Video quality report
• Video Quality Report– , As with the VoIP Quality Report reports
can be produced for IPTV videos treams
– The report will he lp identify the type ofimpairment
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ClearSight Networks CONFIDENTIAL23
Video quality report
VQFactor
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ClearSight Networks CONFIDENTIAL24
Channel Zapping
Channel Zapping
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ClearSight Networks CONFIDENTIAL25
Channel Zapping
• Channe l Zapping– Occurs when view changes channe ls
from one multicas t s tream to another– Client sends IGMP Leave for previouss tream– Client sends IGMP Join for new stream
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ClearSight Networks CONFIDENTIAL26
Channel Zapping
• Channe l Zapping Issues– Channe l Change Latency• Time between when the IGMP Join is sent
and when the multicas t s tream is rece ived• Very short if s tream is a lready near router• Long if reverse pa th must be built to the
multicas t source
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ClearSight Networks CONFIDENTIAL27
Channel Zapping
ReceiveRate ( pps )
Time (t)
Channel2( S1,G2 ) Stream
Channel3(* ,G3 ) Stream
Channel4(* ,G4 ) Stream
Channel Change latency
Channel Gap
Leave Ch.2 ( S1,G1 )
Join Ch.3( *,G2 )
Leave Ch.3( *,G2 )
Join Ch.4( *,G4 )
Channel Overlap
Join Latency
Leave Latency
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ClearSight Networks CONFIDENTIAL28
Channel Zapping
• Channe l Zapping Issues– Channe l Gap• Time between when the view s tops
rece iving one channe l and begins rece iving the next
• Most like ly to occur each ha lf hour when shows change
• Like ly to occur during commercia ls• Gap can result in blank screen for viewer
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ClearSight Networks CONFIDENTIAL29
Channel Zapping
• Channe l Zapping Issues– Channe l Overlap• Multicas t s tream is s till be ing sent for the
previous channel due to IGMP Leavela tency• New multicas t s tream is be ing rece ived a t
the same time• Uses twice the bandwidth
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ClearSight Networks CONFIDENTIAL30
Channel Zapping
Ch.1 Ch.2 Ch.3 Ch.4
Channel Overlaps
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ClearSight Networks CONFIDENTIAL31
Troubleshooting Examples
Troubleshooting Examples
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ClearSight Networks CONFIDENTIAL32
Thank you
Clearsight Networks