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Chapter 9 ATM Networks. Chapter Figures. 48 bytes. 5 bytes. Header. Payload. Figure 9.1. Management plane. Plane management. Control plane. User plane. Layer management. Higher layers. Higher layers. ATM adaptation layer. ATM layer. Physical layer. Figure 9.2. Voice. AAL. A/D.

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Chapter 9 ATM Networks

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Chapter 9 atm networks

Chapter 9ATM Networks

Chapter Figures


Chapter 9 atm networks

48 bytes

5 bytes

Header

Payload

Figure 9.1

Communication Networks


Chapter 9 atm networks

Management plane

Plane management

Control plane

User plane

Layer management

Higher layers

Higher layers

ATM adaptation layer

ATM layer

Physical layer

Figure 9.2

Communication Networks


Chapter 9 atm networks

Voice

AAL

A/D

s1 , s2 …

cells

Digital voice samples

Video

Compression

AAL

A/D

cells

compressed frames

picture frames

Data

AAL

cells

Bursty variable-length packets

Figure 9.3

Communication Networks


Chapter 9 atm networks

User information

User information

AAL

AAL

ATM

ATM

ATM

ATM

PHY

PHY

PHY

PHY

End system

End system

Network

Figure 9.4

Communication Networks


Chapter 9 atm networks

Private ATM network

Private UNI

X

X

Private NNI

Public ATM network A

Public UNI

X

X

X

NNI

X

Public UNI

B-ICI

Public ATM network B

X

Public UNI

X

X

Figure 9.5

Communication Networks


Chapter 9 atm networks

ATM layer

Transmission convergence sublayer

Physical layer

Physical medium dependent sublayer

Physical medium

Figure 9.6

Communication Networks


Chapter 9 atm networks

GFC (4 bits)

VPI (4 bits)

VPI (4 bits)

VCI (4 bits)

ATM cell header

VCI (8 bits)

CLP (1 bit)

VCI (4 bits)

PT (3 bits)

HEC (8 bits)

Payload (48 bytes)

Figure 9.7

Communication Networks


Chapter 9 atm networks

probability density

D0

Peak-to-Peak CDV

Dmax

Figure 9.8

Communication Networks


Chapter 9 atm networks

Service Specific Convergence Sublayer

Convergence Sublayer Common Part

AAL Layer

Segmentation and Reassembly Sublayer

Figure 9.9

Communication Networks


Chapter 9 atm networks

User data stream

Higher layer

b1 b2 b3

Convergence sublayer

CS PDUs

47

47

47

SAR PDUs

SAR sublayer

H

H

H

1 47

1 47

1 47

ATM Cells

H

H

H

ATM layer

5 48

5 48

5 48

Figure 9.10

Communication Networks


Chapter 9 atm networks

(a) SAR PDU header

SNP

Seq. Count

CSI

1 bit 3 bits 4 bits

(b) CS PDU with pointer in structured data transfer

47 Bytes

AAL 1 Pointer

46 Bytes

1 Byte

Figure 9.11

Communication Networks


Chapter 9 atm networks

AAL 2

Mobile switching office

ATM cells

Low bit rate Short voice packets

Figure 9.12

Communication Networks


Chapter 9 atm networks

This example assumes 24 byte packets

Higher layer

P3

P2

P1

Service specific convergence sublayer

Assume null

Common part convergence sublayer

Add 3-byte header to each user packet

H

H

H

3 24

3 24

3 24

SAR sublayer

Segment into SAR PDUs

PAD

1 47

1 47

H

H

ATM layer

5 48

5 48

Figure 9.13

Communication Networks


Chapter 9 atm networks

(a) CPS packet structure

CID (8 bits)

PPT (2 bits)

CPS packet header

LI (6 bits)

UUI (3 bits)

HEC (5 bits)

Payload

Figure 9.14 – part 1

Communication Networks


Chapter 9 atm networks

(b) ATM SDU

Cell Header

SN (1 bit)

P (1 bit)

Start field (STF)

OSF (6 bits)

CPS-PDU payload

PAD

Figure 9.14 – part 2

Communication Networks


Chapter 9 atm networks

Higher layer

Information

User message

Service specific convergence sublayer

Assume null

Pad message to multiple of 4 bytes. Add header and trailer.

Common part convergence sublayer

H

Information

T

PAD

4

4

Each SAR-PDU consists of 2-byte header, 2-byte trailer, and 44-byte payload.

SAR sublayer

2 44 2

2 44 2

2 44 2

ATM layer

Figure 9.15

Communication Networks


Chapter 9 atm networks

(a) CPCS-PDU format

Trailer

Header

AL Etag Length

CPI Btag BASize

Pad

CPCS - PDU Payload

1 1 2 1 - 65,535 0-3 1 1 2 (bytes)(bytes)(bytes)

(b) SAR PDU format

Trailer (2 bytes)

Header (2 bytes)

LI CRC

ST SN MID

SAR - PDU Payload

2 4 10 44 6 10 (bits)(bytes) (bits)

Figure 9.16

Communication Networks


Chapter 9 atm networks

Higher layer

Assume two packets from different users

P1

P2

Service specific convergence sublayer

MID = b

MID = a

Common part convergence and SAR sublayers

Each packet is segmented separately. SAR PDUs identified by MID.

CPCS SAR

CPCS SAR

SPDUA2

SPDUA1

SPDUB2

SPDUB1

Interleaver

Cells from two packets are interleaved.

Interleaved cells

ATM layer

Figure 9.17

Communication Networks


Chapter 9 atm networks

Higher layer

Information

Service specific convergence sublayer

Assume null

Common part convergence sublayer

Information

T

PAD

SAR sublayer

48 (0)

48 (0)

48 (1)

ATM layer

PTI = 1

PTI = 0

PTI = 0

Figure 9.18

Communication Networks


Chapter 9 atm networks

UU CPI Length CRC

Pad

Information

0 - 65,535 0-47 1 1 2 4 (bytes)(bytes)

Figure 9.19

Communication Networks


Chapter 9 atm networks

Signaling application

Message

Message

SSCF maps SSCOP service to service required by SSCF user

SSCF

SSCS

SSCOP identifies gaps in SDU sequence and requests retransmissions

SSCOP

Message T

AAL 5 provides non-assured service

CSCP and SAR of AAL 5

As per Figure 9.18

ATM layer

Figure 9.20

Communication Networks


Chapter 9 atm networks

PL RSVD PDU SN Type

Pad

Information

0 - 65,535 0-3 2 2 4 24 (bytes) (bytes)(bits)(bits) (bits) (bits)

Figure 9.21

Communication Networks


Chapter 9 atm networks

(a) DCC ATM format

1 3 13 19 20

AFI DCC HO-DSP ESI SEL

IDP DSP

IDI

(b) ICD ATM format

1 3 13 19 20

AFI ICD HO-DSP ESI SEL

IDP DSP

IDI

(c) E.164 ATM format

1 9 13 19 20

AFI E.164 HO-DSP ESI SEL

IDP DSP

IDI

Figure 9.22

Communication Networks


Chapter 9 atm networks

UNI

UNI

Source

Destination

Network

SETUP

SETUP

CALL PROCEEDING

CALL PROCEEDING

CONNECT

CONNECT

CONNECT ACK

CONNECT ACK

RELEASE

RELEASE

RELEASE COMPLETE

RELEASE COMPLETE

Figure 9.23

Communication Networks


Chapter 9 atm networks

Network A

Network B

PNNI

PNNI

Figure 9.24

Communication Networks


Chapter 9 atm networks

Source Switch

Transit Switch

Destination Switch

Destination B

Source A

SETUP

SETUP

SETUP

SETUP

CALL PROCEEDING

CALL PROCEEDING

CALL PROCEEDING

CALL PROCEEDING

CONNECT

CONNECT

CONNECT

CONNECT

CONNECT ACK

CONNECT ACK

CONNECT ACK

CONNECT ACK

RELEASE

RELEASE

RELEASE

RELEASE COMPLETE

RELEASE

RELEASE COMPLETE

RELEASE COMPLETE

RELEASE COMPLETE

Figure 9.25

Communication Networks


Chapter 9 atm networks

Logical Link

A

B

Logical Group Node

Peer Group Leader

PG(A)

A.2

A.1

PG(B)

PG(A.2)

PG(A.1)

A.2.2

B.1

A.1.2

B.3

A.2.3

A.2.1

A.2.4

B.2

A.1.1

A.1.3

B.4

Physical Link

Figure 9.26

Communication Networks


Chapter 9 atm networks

A.2

B

A.1.2

A.1.3

A.1.1

Figure 9.27

Communication Networks


Chapter 9 atm networks

ATM network

LIS4

LIS3

LIS5

LIS2

LIS6

LIS1

Router

Router

Router

Router

Router

Figure 9.28

Communication Networks


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