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Video Over IP at the PBS DDMS Philip Schoene Sr. Dir. Engineering & Tech Maintenance PBS 1 In this Presentation Overview of the PBS DDMS Use of open internet for transport stream delivery for PBS Diversity site Comparison to dedicated EPL connection for Disaster Recovery site Use of Video over IP and software on COTS hardware solution for program origination 2 Overview of PBS DDMS • Disaster Recovery – Duplicates the capabilities of the PBS NOC • Diversity – Uplink diversity for rain fade protection of Ku Band services • Maintenance – Allow for continuation of services during high risk maintenance 3 DDMS Progression • Phased buildout – Evergreen content playout – Diversity uplink capability added in 2012 – Non-Real time file delivery added in 2014 – Commissioning of playout system 2014-2015 • Full transmission test on satellite conducted December, 2015 • PBS Broadcast DR Online! 4 Why a new Diversity Site? PBS SOC –Alex.,VA Previous Diversity Site 40 miles from SOC Diversity Uplink –Independent Hill, VA DDMS Uplink DDMS Uplink Site 1650 miles from SOC 5 PBS SOC Diversity System PBS NOC - ALEXANDRIA,VA AUTOMATION & PLAYOUT SDI MPEG4 ENCODING ASI DVB-S2 MODULATION IF TSoIP PBS SOC TRANSMISSION INTERNET TSoIP TO ASI CONVERTER DIVERSITY SITE - LINCOLN, NE 6 ASI DVB-S2 MODULATION IF DIVERSITY SITE TRANSMISSION Broadcast signal over open internet service • TSoIP signals to DDMS: 66 Mbps multiple channel per carrier (MCPC) • East coast, West coast, HD soft feed, SD soft feed • Four 24x7 pass thru services 2 -13.5 Mbps single channel per carrier (SCPC) services • TSoIP signals back from DDMS: 10 Mbps multiviewer of DDMS downlinks 7 What could go wrong? TSoIP MPEG4 ENCODING RECEIVED PACKETS TSoIP to ASI CONVERTER EXPECTED PACKETS 8 What could go wrong? RECEIVED PACKETS P6 P5 P3 P2 t4 P6 t3 P5 P4 P1 t2 t1 P3 P2 TSoIP to ASI CONVERTER P1 EXPECTED PACKETS Dropped P4 tAVG = Inter Packet Arrival Time Dt = Jitter 9 What could go wrong? MPEG4 ENCODING RECEIVED PACKETS TSoIP to ASI CONVERTER EXPECTED PACKETS 10 What could go wrong? • Dropped packets due to congestion at oversubscribed interfaces • Jitter – changes in Inter-packet arrival time • Indeterminate link latency • Packets arrive out of order (reordered) 11 Solution: Managed Service • LTN Global operates a managed backbone of connected datacenters • Appliances operated by LTN manage access to the backbone • Buffers in the appliances allow for: – Deterministic latency – PBS uses 200 ms – Smooths out IPAT – Allows for resend for missed packets – Packets can be reordered 12 LTN Appliance and Managed Backbone LTN APPLIANCE #1 LTN APPLIANCE #2 Data Center connections on LTN managed backbone Managed on backbone 13 Managed by Appliances Bandwidth Headroom • TSoIP signals to DDMS: 66 Mbps (MCPC) + 2 x 13.5 Mbps SCPC = 93 Mbps Add 25% overhead in case of resend 125 Mbps max send • TSoIP signals back from DDMS: 10 Mbps multiviewer of DDMS downlinks Add 25% overhead in case of resend 12.5 Mbps max return 14 Internet Access Topology MUX A PROGRAM TS 100 Mbps D/L RETURN 10 Mbps Multi viewer MUX B LTN APPLIANCE A LTN APPLIANCE B 15 LTN ETH SW FIRE WALL & DMZ ETH SW ISP 1 ISP 2 PBS experience • Issue #1 – PBS Intrusion Detection System was causing intermittent disruption of the signal as it inspected traffic Resolution – Bypass IDS LTN is responsible for security of the appliances • Only outbound connections allowed • Traffic restricted to specific ports 16 Internet AccessTopology MUX A PROGRAM TS 100 Mbps VLAN 10 D/L RETURN 10 Mbps Multi viewer MUX B LTN APPLIANCE A LTN APPLIANCE B LTN ETH SW ISP 1 VLAN 10 & 20 DMZ ETH SW VLAN 10 – MULTICAST VLAN 20 - INTERNET 17 ISP 2 VLAN 20 PBS experience • Issue # 2 - Noticed issue with how we manage “first mile” redundancy • PBS Networking uses Boundary Gateway Protocol (BGP) to manage switching between redundant first mile lSP links – Only switches on loss of service – No protection for excessive packet drops – No protection for excessive delay 18 Internet Access Topology MUX A PROGRAM TS 100 Mbps VLAN 10 D/L RETURN 10 Mbps Multi viewer MUX B LTN APPLIANCE A LTN APPLIANCE B LTN ETH SW ISP selection controlled via BGP on PBS Internet Routers ISP 1 VLAN 10 & 20 DMZ ETH SW VLAN 10 – MULTICAST VLAN 20 - INTERNET 19 ISP 2 VLAN 20 PBS Experience • Resolution: LTN given access to both ISPs simultaneously 20 Dual Access Topology MUX A PROGRAM TS 100 Mbps D/L RETURN 10 Mbps Multi viewer LTN ETH SW 1 LTN APPLIANCE A IRF LINK LTN APPLIANCE B MUX B 21 ISP selection controlled By LTN ISP 1 LTN ETH SW 2 ISP 2 DISASTER RECOVERY SITE PBS NOC - ALEXANDRIA,VA AUTOMATION & PLAYOUT SDI MPEG4 ENCODING ASI DVB-S2 MODULATION IF TSoIP PBS SOC TRANSMISSION INTERNET TSoIP TO ASI CONVERTER DIVERSITY SITE - LINCOLN, NE 22 ASI DVB-S2 MODULATION IF DIVERSITY SITE TRANSMISSION DISASTER RECOVERY SITE PBS MEDIA OPERATIONS CENTER, ARLINGTON, VA CONTENT PREPARATION FILE TRANSFER CONTENT STORAGE ETHERNET PRIVATE LINE (EPL) AS03 & BXF CONTENT STORAGE FILE TRANSFER NRT FILE DELIVERY ASI AUTOMATION & PLAYOUT MPEG4 ENCODING DISASTER RECOVERY SITE LINCOLN, NE 23 ASI DVB-S2 MODULATION IF DDMS TRANSMISSION EPL vs. Open Internet • Disaster Recovery site connectivity serves many more functions: – File transfer – Monitoring via multicast streams PIM network – Remote access and control of site 24 EPL ROUTING EPL POP ROUTER DDMS ROUTER 200 Mbps EPL GigE on LEASED FIBER GigE on LEASED FIBER MOC TRAFFIC FOR: - OPERATIONS (FILE TRANSFER) ADMINISTERED BY EIGRP DIV MULTICAST FACs ILO DDMS SWITCHES 25 SOC OPs ADMINISTERED BY OSPF TRAFFIC FOR: OPERATIONS M&C INBOUND MULTICAST EPL ROUTING DDMS ROUTER RP EPL PIM SPARSE EPL POP ROUTER ARLINGTON, VA MOC RP PIM SPARSE LINCOLN, NE PIM SPARSE DIV PIM SPARSE OPs MULTICAST SOC SPRINGFIELD, VA FILE STORAGE MULTICAST SOURCES 26 MULTICAST RECIEVERS Global Design Concepts Use standards based solutions General Release software based systems built on COTS hardware Independently redundant components 27 Specific Design Concepts Diversity system is independent of the DR System (ingest, playout, encoding) No PBS specific custom software Separate redundant ethernet infrastructure for control, multicast, diversity, facilities, and ILO Wherever possible, video remains in the IP domain 28 Use of Video over IP Contribution via LTN passed to multiplexer as multicast streams Playout servers produce multicast for monitoring IRDs produce multicast streams for monitoring Software based multiviewers aggregate multicast streams and produce 1920x1080 multicast for display anywhere 29 Potential Future Use of Video over IP Contribution feeds direct as video over IP to playout TSoIP replacement of ASI to modulators or Playout servers produce TSoIP ready for multiplexing 30 Conclusions: Network origination on COTS hardware using IP video is feasible and economical Such systems can provide benefits such as flexibility in signal transport Managed services over open internet can provide reliable transport of critical signals 31 Questions? Philip Schoene – [email protected] 32