Network Overview Broadband Internet and Cable TV access
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1 Network Overview Broadband Internet and Cable TV access 22/3/2006 Steve Clemow TelstraClear Architecture
2 Overview Services Hybrid Fibre-Coax (HFC) Network Description High-Speed Data Platform Description Headend and Network Components TelstraClear Architecture March
3 Hybrid Fibre-Coax (HFC) Network Services Services delivered via this network are: Broadcast TV Services Digital and Analogue Cable TV Service Platforms Pay-Per View Content Management and Scheduling Broadband Internet Services On-net Cable Modem Internet Access Digital Cable TV return path traffic is also delivered via a dedicated Cable Modem connection. TelstraClear Architecture March
4 Cable Television (CATV) Network Description High-capacity access infrastructure delivered to customers in Wellington and Christchurch over Hybrid Fibre-Coaxial (HFC) Cable Network Technology Provides Analogue and Digital Cable Television (CATV) Services and High-Speed Internet via Cable Modem Pay-Per-View Services are maintained and managed on ncube Video Server Technology TelstraClear customers via Saturn Cable TV Analogue and Digital Delivered to Sky TV customers via the Satellite Uplink Network TelstraClear Architecture March
5 CATV System Overview Off-air Content Video Server Analogue CATV Digital CATV Wellington Decoding and Playout MPEG Encod e/ Mux Scrambling/ Modulation Cable TV Network Fibre UE OTN Core SDH & IP Networks Satellite Uplink RF Coax Video Server Christchurch Remux Cable TV CustomeNetwork r MPEG Decod e Scrambling/ Modulation OTN Fibre Backbone linking for delivery of TV Channel Content from Wellington to Christchurch RF Coax Analogue CATV Digital CATV Video Servers play Pay-Per View Movies to CATV Customers CPE Required to provide both Cable TV (Analogue/Digital) and High-Speed Internet Customer TelstraClear Architecture March
6 High-Speed Internet Delivered via HFC Cable Modem Technology : DOCSIS Data Over Cable System Interface Spec Mature, standardised and widely available resulting in low-cost CPE and Headend system equipment TelstraClear Architecture March
7 High-Speed Cable Internet Digital Video & Upconverter Analogue Modulators & Upconverter HFC Network + + Digital Set- Top Box TV Customer's Home MAPSOS Headend Cable Modem PC IP Network DHCP TFTP ToD Provisioning Servers DOCSIS CMTS High-Speed Internet Block Diagram TelstraClear Architecture March
8 The Headend The Headend is the Cable TV system s brain The point of origination for television programming and data traffic delivered to and from cable modems Each source requires special processing before it can become part of the combined broadband CATV signal There are a variety of devices at the Headend to process, combine and manage these signals for cable transmission Separate Headends exist in Wellington and Christchurch Kapiti is served via the Wellington Headend for all TV and High- Speed Internet services Most TV Channels are transported in Digital (MPEG) format from Wellington to Christchurch - High-Speed Internet, Pay Per View and some local TV channels are added locally TelstraClear Architecture March
9 Signal Combining Performed at the Wellington and Christchurch Headends before delivery onto HFC networks Achieved through merging groups of individual services into a composite broadband RF signal for transmission. High-Speed Internet Digital TV Analogue TV This signal is then converted into a light source and transmitted via a fibre optic cable to Optical Termination Nodes (OTN) in the HFC Networks TelstraClear Architecture March
10 Hybrid Fibre Coax (HFC) Access Network HFC CATV network consists of a forward path of 77 to 750MHz and a Return path of 5 to 55MHz. Wellington Network started 1996, Christchurch started in 2000 Downstream information is carried via forward path fibre and split passively to Optical Termination Nodes (OTN) TelstraClear Architecture March
11 HFC Network Components Headend Universal Enclosure (Wgtn only) OTN Power Supply Battery backup Sector Amplifier BTD/MB Power Supply No batt backup Amplifier BTD/MB Taps, Couplers, Line Extender s etc. NTE Set-top box Cable Modem Customer s Premises TelstraClear Architecture March
12 Return Path The Return Path comprises of an optical link between the OTN and the Headend. In Wellington returns from each OTN are frequency stacked at each Universal Enclosure (UE) and sent back to the Headend to be demodulated and split back into individual Node paths In Christchurch there is a dedicated upstream fibre from each OTN Used for Two-way communication Data uploading from High-Speed Internet Customers Purchasing of Pay-per View Movies for Cable TV. Digital TV uses the Cable Modem Network for Movie Purchasing and downloading programme guide info TelstraClear Architecture March
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