Kilasan Backbone Telkom Next Generation

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Kilasan BackboneTelkom Next Generation

• Onno W. Purbo
• onno_at_itb.ac.id
• onno_at_indo.net.id

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Philosophy

• The old world
• Box reliability
• Centralized
• The new world
• Network availability
• Distributed

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References

• http//www.cisco.com
• http//www.lucent.com
• http//www.xl.com
• http//www.quicknet.net
• http//openh323.org
• http//openphone.org
• http//www.pulver.com

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Outline

• End User Perspective
• Conceptual Framework
• Next Generation Telco ..

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Voice Quality Comparison
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Conceptual Framework

• H.323

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H.323 Benefit

• Codec Standards.
• Interoperability.
• Network Independence.
• Platform Application Independence.
• Multipoint Support.
• Bandwidth Management.
• Multicast Support.
• Flexibility.
• Inter-Network Conferencing.

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H.323 mengatur ..

• Video Codec (H.261 dll).
• Audio Codec (G.711, G.723 dll).
• Data channel (T.120 dll) e-board dll.
• System Ctrl Unit (H.245, H.225.0 dll).
• H.225.0 layer error detection, error correction
  and frame sequencing.

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Open Standard
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Komponen H.323

• Terminal
• Gateway
• Gatekeeper
• Multipoint Control Unit (MCU)

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Terminal H.323

• Provide Real-Time.
• Provide Two-way communications.
• H.245 nego channel usage capabilities.
• Q.931 Registration/Admission/Status (RAS).
• T.120 Data Conferencing Protocols.

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H.323 Gateway

• Optional!
• Translation function between H.323 conferencing
  endpoints and other terminal types.
• Translation between transmission formats (i.e.
  H.225.0 to H.221).
• Translation between communications procedures
  (i.e. H.245 to H.242).
• Translation between audio and video codecs.
• Performs call setup and clearing on both the LAN
  side and the PSTN side.

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H.323/PSTN Gateway
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Gatekeeper

• The most important component asct as a virtual
  switch of an H.323 enabled network.
• It acts as the central point for all calls within
  its zone and provides call control services to
  registered endpoints.

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Gatekeeper

• Address translation from LAN aliases for
  terminals and gateways to IP or IPX addresses
  (e.g E.164 IP)
• Bandwidth management.
• Route H.323 calls.
• Bill for calls.

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Gatekeeper Zone
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Isu Quality of Service (QoS)

• Kekurangan Bandwidth
• Delay terlalu lama.
• Jitter / Variasi delay.

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QoS

• Resource Reservation Protocol (RSVP)
• Real Time Protocol (RTP)
• Compressed Real Time Protocol (CRTP)
• Traffic Shaping
• Queuing Custom Queuing, Weighted Fair Queuing.
• Congestion Control Random Early Detection.
• Effisiensi Jaringan link fragmentation
  interleaving.

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Metoda Kompresi
Kompresi Kbps MIPS ms MOS
G.711PCM 64 0.34 0.125 4.1
G.726 ADPCM 32 14 0.125 3.85
G.728 LD-CELP 16 33 0.625 3.61
G.729 CS-ACELP 8 20 10 3.92
G.729 x2 Encoding 8 20 10 3.27
G.729 x3 Encoding 8 20 10 2.68
G.729a CS-ACELP 8 10.5 10 3.7
G.723.1 MPMLQ 6.3 16 30 3.9
G.723.1 ACELP 5.3 16 30 3.65
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Intermediate Solution VoIP
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Interkoneksi Suara-Data-Suara
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Interkoneksi PC-Telepon
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Gatekeeper

• Lucent PacketStar IP Gatekeeper
• 23.500 DSO
• 2.300.000 calls / day (one zone)
• 7.800.000 calls / day (multi zone)
• Cisco CallManager
• Windows NT
• Quicknet
• H.323 Internet SwitchBoard

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Gateway

• Lucent PathStar
• 80.000 POTS
• 10.000 xDSL
• Cisco DE-30
• 30 voice on E1
• Cisco AT-2, 4, 8
• Analog loop RJ-11, 2, 4, 8 POTS.

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Next Generation Telco
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Split Data Voice Network
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Converged Enterprise Network
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Philosophy

• The old world
• Box reliability
• The new world
• Network availability

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Network Availability
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Network Availability

• Redudancy at many levels.
• Advanced Layer 3 Protocols
• Hot Standby Routing Protocol (HSRP).
• Open Shortest Path First (OSPF).
• Enhanced Interior Gateway Routing Protocol
  (EIGRP).
• Multicast Routing
• Protocol Independent Multicast (PIM).
• Distance Vector Multicast Routing Protocol
  (DVMRP).

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How? Detailed ..
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End-to-End Architecture
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Open Architecture

• H.323
• Simple Gateway Control Protocol (SGCP)
• Media Gateway Control Protocol (MGCP)
• Session Initiation Protocol (SIP)
• Telephony Application Programmable Interface
  (TAPI)
• Java Telephony Application Programmable Interface
  (JTAPI)

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Low Cost of Ownership
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WAN QoS-Enabling Tech.
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Classification

• Layer 3 (IP)
• IP Precedence VoIP ? 5.
• Differentiated Services Code Point (DSCP)
• Layer 2 (MAC) schemes
• Voice ? RTP
• Voice ? UDP
• Voice ? Port 16383 - 32767

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Prioritizing

• Voice Traffic
• Priority Queuing (PQ)
• Data Traffic
• weighted fair queuing (WFQ)
• class-based weighted fair queuing (CBWFQ)

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Prioritizing
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Link-Efficiency Techniques

• Voice Compression (e.g. G.723).
• Compressed RTP
• 40 byte IPUDPRTP ? 2-4 bytes.
• Voice Activity Detection (VAD).
• Link Fragmentation Interleaving.
• Frame Relay FRF.12
• Serial Link Multilink PPP (MLP).

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Traffic Shaping

• Multiple access nonbroadcast media such as ATM
  and Frame Relay where the physical access speed
  varies between two end points.

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QoS Strategies

• Classification is a key attribute.
• Queuing techniques.
• Buffer management is also used to ensure that
  excess jitter is not added for voice traffic.
• To combat this, the multilayer LAN switches
  provide either two queues or a single queue with
  definable drop thresholds to bound delay.

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Terima Kasih
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