A

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• A
• SEMINAR REPORT ON
• ASYNCHRONOUS TRANSFER MODE(ATM)
• Under the Guidance of
• Mr R.K.Shial
• By
• Sangram Sekhar Choudhuri
• CS200118218

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INTRODUCTION

• High performance, cell-oriented switching and
  multiplexing technology
• Utilizes fixed-length packets to carry different
  types of traffic
• Helps in efficient multimedia applications,
  high-speed LAN connections and used in broad
  range of networking devices

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OVERVIEW
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BENEFITS OF ATM

• high performance via hardware switching
• dynamic bandwidth for bursty traffic
• class-of-service support for multimedia
• scalability in speed and network size
• common LAN/WAN architecture
• opportunities for simplification via VC
  architecture
• international standards compliance

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ATM CELL HEADER FORMAT
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ATM REFERENCE MODEL
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ATM ADDRESS FORMAT
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ATM SERVICE CLASSES

• constant bit rate (CBR)
• variable bit ratenon-real time (VBRNRT)
• variable bit ratereal time (VBRRT)
• available bit rate (ABR)
• unspecified bit rate (UBR)

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ATM TECHNICAL PARAMETERS

• cell loss ratio (CLR)
• cell transfer delay (CTD)
• cell delay variation (CDV)
• peak cell rate (PCR)
• burst tolerance (BT)
• sustained cell rate (SCR)

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ATM STANDARDS

• A cohesive set of specifications that provide a
  stable ATM framework.
• Provide the end-to-end service definitions
• An important ATM standard is interworking between
  ATM and frame relay
• Two ATM networking standards
• 1)broadband intercarrier interface (BICI)
  2)public network-to-network interface (PNNI)
  

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DATA INSERTION SCHEMES

• RFC1483-specifies how interrouter traffic is
  encapsulated into ATM
• LANEMPOA- support dynamic use of ATM SVCs
• voice and video adaptation schemes-for efficient
  traffic that no natural breaks, such as a circuit
  carrying bits at a fixed rate

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ATM LAN EMULATION(LANE)

• LANE components
• 1)LANE clients
• 2)LANE servers

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VIDEO OVER ATM

• Handled by VBRRT VCs using AAL5 for MPEG2 on
  ATM for video-on-demand applications
• MPEG2 coding can result in two modes
• program streamsvariable-length packets carrying
  single or multiple programs
• transport streams188-byte packets that contain
  multiple programs
• Time stamps are inserted into MPEG2 packets
  during the encoding and multiplexing process to
  make better use of networking resources.

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VOICE OVER ATM

• VBRRT connections is used over ATM which uses
  silence period.
• Various dynamic compression techniques are used
  to free bandwidth and alleviate congestion
• A further enhancement is to support voice
  switching over SVCs which interprets PBX (private
  branch exchange) signaling and routing voice
  calls to the appropriate destination PBX

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NETWORK TRAFFIC MANAGEMENT

• objectives To deliver quality-of-service (QoS)
  for multimedia applications and provide overall
  optimization of network resources.
• categorized into three distinct elements
• nodal-level controls that operate in real time
• network-level controls operate in near real time
• network engineering capabilities operating in
  non real time

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ATM APPLICATIONS
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ATM AND IP INTERWORKING

• ATM and IP offer Scalability, traffic
  engineering, service differentiation, high
  availability, value-added applications such as
  Virtual Private Networks (VPNs)
• Some specifications of ATM and IP
• Multi-Protocol over ATM (MPOA) as addition to LAN
  Emulation (LANE)
• Additions to ATM's superior routing protocol PNNI
• adoption of Frame-based ATM over Sonet/SDH (FAST)
  

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CONCLUSION

• ATM technology is the only technology that can
  guarantee a certain and predefined quality of
  service.
• The growth of the Internet, need for broadband
  access and e-commerce are spurring the need for a
  reliable, flexible, scalable, predictable,
  versatile transport system and that is given by
  ATM Technology.
• For voice, video, data and images together, the
  next generation network depends on ATM.

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THANK YOU