Asynchronous transfer mode (atm)

1. Technical Seminar
A
SEMINAR REPORT ON
ASYNCHRONOUS TRANSFER MODE(ATM)
Under the Guidance of
Mr R.K.Shial
By
Sangram Sekhar Choudhuri
CS200118218
Presented by :- Sangram Sekhar Choudhuri(CS200118218)1

2. Technical Seminar
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
Presented by :- Sangram Sekhar Choudhuri(CS200118218)2

3. Technical Seminar
OVERVIEW
Presented by :- Sangram Sekhar Choudhuri(CS200118218)3

4. Technical Seminar
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
Presented by :- Sangram Sekhar Choudhuri(CS200118218)4

5. Technical Seminar
ATM CELL HEADER FORMAT
Presented by :- Sangram Sekhar Choudhuri(CS200118218)5

6. Technical Seminar
ATM REFERENCE MODEL
Presented by :- Sangram Sekhar Choudhuri(CS200118218)6

7. Technical Seminar
ATM ADDRESS FORMAT
Presented by :- Sangram Sekhar Choudhuri(CS200118218)7

8. Technical Seminar
ATM SERVICE CLASSES
• constant bit rate (CBR)
• variable bit rate–non-real time (VBR–NRT)
• variable bit rate–real time (VBR–RT)
• available bit rate (ABR)
• unspecified bit rate (UBR)
Presented by :- Sangram Sekhar Choudhuri(CS200118218)8

9. Technical Seminar
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)
Presented by :- Sangram Sekhar Choudhuri(CS200118218)9

10. Technical Seminar
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 (B–ICI)
2)public network-to-network interface (P–NNI)
Presented by :- Sangram Sekhar Choudhuri(CS200118218)10

11. Technical Seminar
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
Presented by :- Sangram Sekhar Choudhuri(CS200118218)11

12. Technical Seminar
ATM LAN EMULATION(LANE)
• LANE components
1)LANE clients
2)LANE servers
Presented by :- Sangram Sekhar Choudhuri(CS200118218)12

13. Technical Seminar
VIDEO OVER ATM
• Handled by VBR–RT VCs using AAL–5 for
MPEG2 on ATM for video-on-demand
applications
• MPEG2 coding can result in two modes:
1. program streams—variable-length packets
carrying single or multiple programs
2. transport streams—188-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.
Presented by :- Sangram Sekhar Choudhuri(CS200118218)13

14. Technical Seminar
VOICE OVER ATM
• VBR–RT 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
Presented by :- Sangram Sekhar Choudhuri(CS200118218)14

15. Technical Seminar
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
1. nodal-level controls that operate in real time
2. network-level controls operate in near real time
3. network engineering capabilities operating in
non real time
Presented by :- Sangram Sekhar Choudhuri(CS200118218)15

16. Technical Seminar
ATM APPLICATIONS
Presented by :- Sangram Sekhar Choudhuri(CS200118218)16

17. Technical Seminar
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
1. Multi-Protocol over ATM (MPOA) as addition to
LAN Emulation (LANE)
2. Additions to ATM's superior routing protocol
PNNI
3. adoption of Frame-based ATM over Sonet/SDH
(FAST)
Presented by :- Sangram Sekhar Choudhuri(CS200118218)17

18. Technical Seminar
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.
Presented by :- Sangram Sekhar Choudhuri(CS200118218)18

19. Technical Seminar
Presented by :- Sangram Sekhar Choudhuri(CS200118218)19