Patton-Inalp VoIP and VDSL Deployment IP/WAN

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1 Patton-Inalp VoIP and VDSL Deployment IP/WAN SN4114 SN4524

2 Agenda VoIP Technology Technical Terms / What is VoIP? CODEC s / Media and Signaling Standards IP and Quality of Service VoIP Carrier Applications The Provider Market and Application Segmentation Reference Networks VDSL Deployment Reach Bandwidth Network Scenarios A few Product Slides VoIP Product Overview VDSL Products G.SHDSL Product Line

3 What is VoIP the technology Analog or Digital voice circuit VoIP Gateway IP Packets with Voice Samples VoIP Gateway Analog or Digital voice circuit IP Network Internet Some general notes VoIP is a widely standardized and well understood technology available for more than 10 years. The quality of VoIP depends on the compression method (CODEC) and the network conditions. It ranges from ISDN toll quality to Cell Phone (or worse) VoIP is past the technology hype today VoIP is now widely interoperable (still, be aware )

4 VoIP Technology: Media Standards Various CODECs are used for voice compression: Codec Codec Rate [kb/s] IP BW/Call one way [kb/s] Packet Length [ms] Comments G /20 Toll quality, full rate, lowest delay G Free: good compromise G Licensed: good compromise Licensed: min. bandwidth GSM-EFR For Reference: mobile phones Use G.711 if no bandwidth limitations apply Toll Quality Low Delay Recommend G.726 for good bandwidth-quality ratio! High Quality POS support

5 Fax over IP: watch out for this 1) Fax Bypass, G.711 The Fax is carried in a G.711 voice channel just like a regular phone call. + Is interoperability with any gateway - Uses more bandwidth - Is less reliability 2) Fax Relay, T.38 The Fax tones are terminated in the gateway, relayed in packet form and re-modulated at the far end. + Uses less bandwidth + Is reliability(offers redundancy) - Is less interoperable T.30 Fax A/D Fax-Relay, T.38 packets D/A T.30 Fax IP Fax Bypass, T.30 Fax over G.711, 96Kb

6 Signalling Standards Snapshot Signaling protocols defines how VoIP equipment communicate to set-up and release telephone calls over IP networks. For example Ring, Talk and Hang-up. H.323 The first multimedia over IP protocol Peer-to-peer, defined by the ITU, current Version is v4 Offers high interoperability between 3 rd party equipment Supported in SmartNode since 1999 SIP The newest of the VoIP call control protocols Peer-to-peer, defined by IETF, looks like html, most extendable Supported in SmartNode since 2003 MGCP Master-Slave protocol for centralized Softswitch Carrier architectures Various forms NCS (Cable), H.248, Megaco MGCP/IUA is supported in SmartNode for BRI Interfaces since 2000

7 Telephony Terms THESE YOU HAVE TO KNOW! BRI, S 0, S/T E1, PRI, S 2m T1, PRI FXS FXO Switch 2 B + 1 D channel > 2 voice connections 30 B + 1 D channel > 30 voice connections 23 B + 1 D channel > 23 voice connections phone jack, 2-wire POTS interface line jack, 2-wire POTS interface ISDN 4-wires BRI/PRI NT TE IP 4-wires NT TE Switch POTS 2-wires IP 2-wires FXS FXO FXS FXO

8 VoIP Technology and QoS IP and Quality of Service (QoS) DownStreamQoS

9 QoS and VoIP: Where s the Problem WAN and Access: the network bottleneck 10/100/1000 Mbit/s ~100 kbit/s - ~1Mbit/s 155/622/1000 Mbit/s LAN Access Link Backbone GigE, SDH In the LAN QoS Issues can be solved with a clean structure an overprovisioning In the Access and WAN Bandwidt is expensive and must be used optimally

10 QoS and VoIP: What's the Problem (1) Jitter and Delay caused by best effort queues Link Bandwidth Trm delay 1500 byte Packet VoIP 64 kbps 187 ms 128 kbps 93 ms WAN Link LAN Daten 256 kbps 46 ms 512 kbps 23 ms 768 kbps 15 ms 1536 kbps 7.5 ms End-to-end delay should be kept bellow 200ms Delay components are Packetization delay, Tranmission delay 1 and 2, Buffering delays Jitter compensation is a major contribution to end-to-end delay.

11 QoS and VoIP: What's the Problem (2) Packet Loss through Queue overflow LAN Access Link Backbone All network equipment has limited queues Data traffic (TCP) will always try to get maximum throughput Queues should be short for real-time (voice) traffic Packet loss is NOT critical for Data (TCP) traffic

12 QoS und VoIP: What s the Problem (3) Example Measurement with one VoIP call and a FTP download over a best-effort 500k Link. About 25% of the voice packets are lost at the access to the Bottleneck!

13 Building Blocks for QoS (1) The QoS Chain in a Network Node Classifier Marker Meter Conditioner Policer Queue with Queue-Algorithm M C Scheduler M.. C Scheduler Scheduler M C

14 Building Blocks for QoS (2) For Example: Traffic Shaping A Shaper can limit a Traffic Class to a defined bandwidth Frees Bandwidth for real-time (voice) traffic without packet loss Improves the Performance of interactive Applications Very usefull for short connections e.g Web requests Bandwidth Bandwidth max voice max voice unused Data Burst Web-Page WWW SH unused Data Data Burst Burst Web-Page t t

15 QoS Standards 802.1p/Q TOS DiffServ MPLS RSVP Classification 8 Priority- Classes 3 Types, 4 Precedence Max. 64 Classes, some predefined Open Administrator By Application Tagging 3 Bit in Ethernet Header 1 Byte (3 + 5) in IP Header 1 Byte in IP Header (replaces TOS) Using L2 Header or Additional (Shim)-Label None (IPv4 Addr, Port) Conditioning Fix Priority Behavior partially defined 2 Per-Hop- Behaviors defined (EF, AF) Traffic Engineering Requested by Application (TSpec) Market- Penetration Used more and more in LAN s Supported by most equipment but not widely used Supported by equipment but not widely used In deployment in backbone networks Rarely used

16 DownStreamQoS Where is the Problem Solution How does it Work FAQ

17 Problem The Internet and many large IP networks only support best effort packet forwarding. There is no differentiation between time critical IP packets such as VoIP and other traffic such as web pages mail etc. If an overload situation occurs (at the network bottleneck) VoIP and other packets are discarded with the same probability. This leads to a degradation in voice quality while other traffic is simply retransmitted and the user just experiences a slow-down CPE Access Link Edge Router Internet Web Server VoIP

18 Solution The network bottleneck is in most cases the subscriber access line DSL, Cable etc of ~< 2 Mb/s Both LANs (10/100 Ethernet) and Backbone Networks (Fibre, SDH or ATM) are much Faster In case of congestion packets are discarded at the Edge router of the Internet access provider (see previous slide) SmartNode DownStreamQoS introduces a dynamic virtual bottleneck at the customer premises that starts to discard non-realtime traffic before it starts to block the voice traffic in the edge router Virtual Bottleneck Edge Router Internet Web Server VoIP

19 How Does it Work Most Data traffic (~80%) is sent using the TCP protocol. TCP continuously increases the used bandwidth (slow-start) until the maximum throughput is reached and packets are dropped (not acknowledged by remote end) A separate queue for TCP makes it possible to delay and if required discard traffic before the access link is full The traffic management (scheduler) for this queue is adapted dynamically based on the bandwidth required for voice calls

20 Smart combination of QoS and VoIP The integration of QoS Router and VoIP Gateway makes things much easier Traffic Classes are defined at network interfaces No tagging necessary for point-to-point links Optimal bandwidth usage and control Classification Marking Conditioning LAN GW Q WAN Link GW Q LAN

21 VoIP Provider Applications Multiservice Broadband Access Market Segmentation Applications Reference Deplyoments

22 Applications in the Provider Market Multi-Service Broadband Access Bind Customers through Service Differentiation Internet Services Application Services Bind Customers with Bundled Services Cut Operation Costs through Converged Service Delivery Voice Services PSTN Provider Backbone Increase ARPU Reduce churn PowerLine BB Access WLL xdsl CATV Leased Lines SmartNode Customer Premises Gateways Customer Networks

23 Carrier Market Segments Alcatel, Siemens, Huawei Cirpack, NetCentrex Aarenet, Sysmaster, QIIQ, SER Tier I Incumbent Telcos Tier II CLECs & Large ISPs Tier III Small and Medium ISPs and CLECs Swisscom, DTAG, Telefonica,... Sunrise, Arcor, Tele2... Green, Inode, TeleJet... Through Partners Patton can offer complete solutions for Tier III Patton offers CPEs for Tier I and Tier II Systems

24 VoIP in Provider Networks Application Motivation Penetration Tier I Carrier Trunking (100s SS7/E1 trunks) Cost savings on transport bandwidth Higher than expected Long Distance Transport Compression Statistical multiplexing Lower cost IP Bandwidth Estimated 30% do VoIP trunking on some lines Tier II Last-mile Bypass (V5, Shared PRI) 1st line Service Carrier Trunking Direct Subscriber Access Interconnection Toll- Bypass Differentiated Service Offering First Providers on the market E.g. Fastweb, Inode, Green Tier III Calling-Card Call-Shops (Internet Cafes) VoIP Termination 2nd line Service Low entry barrier (no $1MM PSTN switch) Regional Focus Short Term Revenues Some growing providers (sipgate, nikotel ) many small operators

25 Reality Check Provider Solutions Avantel Mexico Second largest Telco in Mexico Data, VPN and VoIP Services Selected SmartNode to replace Cisco 1700 and 2600 Series Alcatel Softswitch based, Cisco SS7 interconnect Inode.at Leading Austrian xdsl ISP Started SME VoIP Service italk in Q Open Source SER based, SmartNode PRI interconnect Green.ch Leading Swiss SME ISP Launching VoIP Service in Q Aareswitch based, SmartNode/Squire SS7 interconnect

26 VDSL Technology and Deployment Reach and Bandwidth Deployment Scenarios Typical Applications

27 VDSL Line Speeds and Reach Asymmetrical Line Rates Upstream Downstream (Mbps) (Mbps) Distance (24 AWG.4mm) 1.80km 1.55km 1.49km Distance Typical Asymmetrical uses: Digital Broadcast TV Video on Demand (VoD) High-Speed Internet Access Distance Learning Telemedicine Symmetrical Line Rates Distance (24 AWG) Upstream (Mbps) Downstream (Mbps) Distance km km km km Typical Symmetrical uses: Network Backbone (Data Backhaul) High-Speed Data Applications Video Teleconferencing Tele-Consulting Applications = factory default setting

28 VDSL Deployment Scenarios Because of Reach Limitations VDSL is usually used in combination with Fibre FTTC Fibre to the Curb (VDSL to the buildings) FTTB Fibre to the building (VDSL in house e.g. MTU/MDU) FTTH Fibre to the Home Because of the required Infrastructure these solutions are mostly applied in... MDU Multiple Dwelling Unit MTU Multiple Tenant Unit Campus Networks Business Parks Hotels Etc...

29 VDSL Campus and MTU/MDU deployment Ethernet Layer 2 Access

30 Higher Layer Protocols VLAN based leased lines or distributed LANs Transparent Layer 2 point-point or multipoint networks VLAN based QoS Provisioning Use different IEEE 802.1pQ service classes for voice, data, video services Access to standard DSL Services PPPoE, Broadband RAS, L2TP R Router IP Address MPLS VLAN2 B Bridged 802.1pQ VoIP Switch-Router R VLAN1 Concentrator VDSL Modem IAD Voice Data R 10/100/1000 B 2-wire B 10/100bT R Data PPPoE

31 A few Slides on Products SmartNode SmartLink Family SmartWare Features VDSL Products

32 SmartNode Product-Line Overview SmartNode 4100 Series 4500 Series SmartNode SmartNode IC-4FXS IC-4BRV IC-E1V 1-8 port FXS/FXO Gateways and VoIP Routers SOHO and branch office applications 1-2 port ISDN BRI Gateways and VoIP Routers SOHO and branch office applications Modular Ethernet und Leased Line access routers with support for up to 120 VoIP channels BRI, PRI and FXS VoIP Gateway Cards for the SmartNode 2000 Series And many more see

33 SmartWare Feature Overview Voice over IP SIP H.323v4, H.323+ ISDN over IP (ISoIP) MGCP/SCTP/IUA T.38 (Fax over IP) Router IPv4 Router, RIP Firewall (NAPT, IP Filter) DHCP (Client and Server) PPP (PPPoE and Leased Lines) Frame-Relay Optional IPSec VPN Voice Processing and Signaling CODECs: G.711, G.726, G.727, G.723, G.729 Euro ISDN BRI and PRI, QSIG US/NI-2, RBS on T1 SessionRouter Call Routing: Calling and Called Number Time, Weekday, Date ISDN Bearer Capability Wildcards and regular expressions Nummer Manipulation Functions Fallback Strategies Quality of Service Voice Priority Multiple Traffic Classes DownStreamQoS Traffic Scheduling TOS, DiffServ, 802.1p Management Web GUI Fully documented CLI (Cisco like) Telnet and TFTP Configuration Up- and Download Remote firmware upgrade Local Console SNMP, MRTG

34 3324 VDSL Concentrator 24 software selectable asymmetrical or symmetrical VDSL ports Fully manageable Layer 2 Ethernet switch/layer 3 switch and routing functionality Built-in POTS/ISDN splitter for all 24 VDSL ports Local and remote testing and management capabilities Bandwidth management Dual auto-sensing RJ /1000 BaseT or GBIC for Ethernet uplink or cascading Cascade up to 4 VDSL concentrators for up to 96 ports Compliant with ETSI, ITU, and ANSI standards

35 1001 Telco Rack System High-density rack system supports up to 16 modems in a 2U-high, 19-inch wide rackmount chassis with integral AC/DC power supply Configurable input/output modules support all serial, voice/fax, Ethernet interfaces DSL Cards - G.SHDSL, VDSL Integrated SNMP and HTTP management system Automatic load-sharing, dual-redundant AC and DC power supplies Network management via SNMP or HTTP Dual-redundant AC and DC power supplies Great Modularity & Interface Functionality

36 1068 VDSL Modem with Splitter Ethernet Extension - Extends Ethernet distances over 1.6 km over 2-wire 24 AWG unconditioned lines Switch Selectable - Asymmetrical or symmetrical line rates up to Mbps! Auto-sensing Full-Duplex Ethernet - Auto-selected 10Base-T or 100Base-TX; supports full or half-duplex Ethernet Transparent LAN bridging - Passes higher layer protocols and supports 802.1Q VLAN tagging Automatic Learning, Aging, and Filtering

37 G.SHDSL Products Full Line of G.SHDSL Products Modular Rack Systems 2U, 4U, 6U 1U Pizza Box Concentrator TDM based and IP routing/bridging Unique symmetric 4.6 Mb/s on 2-wire

38 Patton-Inalp VoIP and VDSL More Than Just Talk! Distribution Partner

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