CABLE TELEPHONY AND PACKETCABLETM. June 17, 2015

Transcription

1 CABLE TELEPHONY AND PACKETCABLETM June 17, 2015

2 SCTE LIVE LEARNING Monthly Professional Development service Generally Hot Topics or Topics of high interest to the industry Vendor Agnostic No product promotion Free to SCTE members Live sessions are recorded Members-only benefit

3 TODAY S SESSION Approximately 50 minutes discussion 10 minute Q&A at the end, however.. Ask questions anytime throughout the session Asking questions adds value and enhances learning opportunity for you and others

4 HOW TO ASK A QUESTION Select the Q&A tab Type in your question and submit

5 NOW LET S GET STARTED CABLE TELEPHONY AND PACKETCABLE TM

6 Rick Kelly, Network Training Instructor SCTE Denver University graduate (M.S)and holds a current CCNA certification 32 years in telecommunications and new technology implementation His area of specialization is TDMand Wireless Engineering, satellite, cable- VoIP and IP network design

7 Agenda Upon completion of this module the participant will be able to: Explain a 5-step process for how VoIP is created Classify VoIP protocol functional areas Describe VoIP signaling protocols in use today: MGCP and SIP Distinguish between PacketCable 1.5 and 2.0

8 VoIP Overview How is VoIP created? Five basic steps are needed 1. Transduction conversion of a varying magnetic field, such as an analog signal, into an electrical waveform 2. Sampling measuring the analog signal level at precise intervals 8000,16000or even 64000times per second 3. Digitizing binary representation of each measurement 4. Digital Signal Processing (DSP) preparing the sampled audio for transmission 5. Packet creation short duration packets of; 5,10, 20, or 30 milliseconds

9 VoIP Application Protocols Real-time Transport Protocol (RTP) RFC 3550/3551 Provides end-to-end network transport functions Gathers media (voice and video) information to be packetized Best effort delivery of voice (< 200msec)

10 VoIP Media Protocol Session Description Protocol (SDP) RFC-4566 Used with signaling protocols to negotiate media session attributes and establish endpoint operational modes v=0 o=root IN IP s=session c=in IP t=0 0 m=audio RTP/AVP a=rtpmap:0 PCMU/8000 (G.711 ulaw) a=rtpmap:8 PCMA/8000 (G.711 ALaw) a=rtpmap:101 telephone-event/8000 (DTMF) a=fmtp: (#0-9,10=*, 11=#, 12-15= A-D) a=silencesupp:off a=ptime:20 a=sendrecv Media attribute description Supported CODECs are listed Most preferred CODEC is negotiated first, then lower quality CODECs are attempted

11 SDPModes VoIP Media Protocol Places endpoints in several modes, with these four being the most common:» One-way reconly or sendonly Calling Party E.G. Ring-back Tone» Two-way sendrecv Conversational mode» Idle state inactive Operational mode, but not active in communication Called Party

12 VoIP Signaling Protocol Media Gateway Control Protocol (MGCP) 1.0 VoIP standard created for IP to MGCP interconnection Network-based Call Signaling (NCS), created by CableLabs, is used to control local network end-points called Media Terminal Adapters, or MTAs All endpoints, local or interconnection, are controlled by a Call Agent (CA) in a client-server manner The CA is typically an integrated IP switch, which controls calling via three primary components (functional areas)» Call Management Server (CMS)» Media Gateway Controller (MGC) for Off-net calls» Signaling Gateway (SG) converts SS7 to IP using SIGTRAN

13 VoIP Signaling Protocol Session Initiated Protocol (SIP) RFC 3261 IETF developed SIP in 2002» Quickly becoming the predominant VoIP signaling protocol» Controls (signals) media sessions, but is not a media protocol, but rather, it works in conjunction with other protocols to establish multi-media sessions» Intelligent end-points called User Agents (UAs) handle the majority of the call setup process, which differs from MGCP, where a CA controls nearly all of the actions of an end-point» UA initiates sessions or is notified of another SIP entity (end-point) requesting session establishment» Before making or receiving a session request, a UA must register on network and then be authorized

14 PacketCable1.5

15 PacketCable 1.5 Initial Cable-VoIP Core controlled network Call Management Server (CMS) Signaling Gateway (SG) Media Gateway Controller (MGC) Media Gateway (MG) Media Terminal Adapter (MTA), also known as a Residential Gateway 1 (1) While a standalone MTA specification existed when PC 1.0 was released, nearly all of the deployed MTAs were embedded (E-MTA) within a cable modem starting with PC 1.5

16 PacketCable 1.5 Network Topology Signal Transfer Point Cable Modem Termination System CMTS CMS IP Backbone MGC SG Service Switch Point STP SSP PSTN Switch HFC RTP Stream (VoIP) MG T R U N K CSV MATRIX L I N E MTA =IP Signaling =SS7 Signaling =Media

17 PacketCable2.0

18 PacketCable IP Multi-Media Subsystem (IMS) Decentralized architecture Local network User Equipment (UE) Access Network CMTS Call Session Control Function (CSCF) - Edge Proxy (P-CSCF) CSCF Core Interrogating (I-CSCF) Serving (S-CSCF) Home Subscriber Server (HSS) (2) Primary architecture for PC 2.0 is outlined in the 3GPP/IMS delta specification: PKT-SP I with more than 100 supplemental references

19 PacketCable 2.0 Network Topology S-CSCF UE E-MTA CMTS Proxy for UE P-CSCF I-CSCF Core Network area HSS Local and Access Network area Edge Network area BGCF & BCF Subscriber data Breakout Gateway & Boarder Control Function

20 SUMMARY An abstract 5-step process for how VoIP is created VoIP protocol functional areas: Application, Media and Signaling Predominant VoIP Protocols in use today: MGCP and SIP PacketCable 1.5 and 2.0

21 HOW TO ASK A QUESTION Select the Q&A tab Type in your question and submit

22 THANK YOU TO OUR SPEAKER Rick Kelly SCTE

23 REMINDER This session has been recorded Will be available on SCTE s Member s Only Site within 2-3 days To access previously recorded sessions login to: with your member ID#, then scroll to the bottom of the page and select SCTE Live Learning Archives for a menu of previously recorded Live Learning sessions

24 LIVELEARNING ARCHIVES Free for SCTE Members Under Resources/LiveLearning Archives Topics include: Advanced Advertising Broadband Premises Business Services DOCSIS Emergency Alert System (EAS) Energy Ethernet Fiber Transport HFC Systems Home Networking IP OCAP PacketCable Routing Service Management Standards Video VoIP Wireless Technology

25 NEXT MONTH Register for the next SCTE Live Learning webinar The 4K Evolution July 15, :00 p.m. Eastern Under Professional Development/Live Learning Available today at the conclusion of this presentation

26 LIVELEARNING REGISTRATION Register for the SCTE LiveLearning Series Under Professional Development/ LiveLearning Webinars Available today at the conclusion of this presentation Third Wednesday of the month at 2 PM Eastern