Object Modelling Report: Analysis of ATM Subsystem Architecture

This report provides a detailed analysis of object modelling applied to Automated Teller Machine (ATM) subsystems. It begins with an introduction to ATMs and their significance, followed by a discussion of Asynchronous Transfer Mode (ATM), the core technology enabling ATM networks. The report then delves into ATM cells, their structure, and the standards supporting ATM. A comprehensive overview of the ATM subsystem architecture is presented, including system-level processes, libraries, ATM service providers, ATM clients, the ATM subsystem manager, and the ATM manager process. The report also covers the driver/interrupt handler (DIH) and concludes with a summary of the key findings. The report references various sources to support its analysis of the Collin ATM subsystem.

Running head: OBJECT MODELLING
Object modelling
Assessment 3
[Name of the student]
[Name of the university]

1OBJECT MODELLING
Table of Contents
Introduction 2
Discussion 2
ATM Cells 4
Standard Support of ATM 5
Architecture of ATM Subsystem 5
System-Level processes and Libraries 5
ATM Service providers 6
ATM clients 6
ATM subsystem Manager 6
ATM Manager Process (AMP) 7
Driver/ Interrupt handle (DIH) 7
Conclusion 7
References 9

2OBJECT MODELLING
Introduction
ATM stands for Auto Teller machine is considered to be considered to be an important
tool which is used in various zones. ATM is also referred to as a kind of cash machine which is
used for dispensing cash (Baroud, Benmiloud & Benalia, 2015). It is a kind of computerized
telecommunication which provides financial institutes like bank to establish a secure
communication by providing proper kinds of access to bank accounts.
In the coming pages of the report an idea has been provided regarded ATMs. Various
kinds of topics like Asynchronous Transfer Mode (ATM), ATM cells, standard support of ATM
has been provided with respect to Collin ATM. A proper architecture of ATM subsystem has
been discussed. Various kinds of system level process and libraries has been discussed.
Discussion
The subsystem of Collin ATM provides a proper kinds of access to various ATM
networks from a non-stop series kind of server. The system of this ATM provides support for
User-Network interface (UNI) with a speed of 155 Mbps which comes up with Synchronous
optical network (SONET) connection.

3OBJECT MODELLING
Figure 2: Showing sequence diagram of Collin’s ATM
(Source: Created by author)

4OBJECT MODELLING
Asynchronous Transfer Mode (ATM)
ATM protocol is generally based on packet-switched, architecture of broadband network
which makes use of cell-relay mechanism for proper transferring of data, voice and information
related to video call. ATMs are generally organized into various kinds of layers and planes.
Various kinds of layers generally define the services which are related to cell creation, paths and
channels and translation of protocol by making use of communication services.
Various kinds of layers are physical layers, ATM layers, ATM Adaptation layer (AAL).
The physical layer generally corresponds to layer 1 of the seven layer OSI references model.
This layer generally handles bit-timing and also checks the validity of cells created and
transmitted. ATM layer will provide cell headers and trailer, virtual channels and paths which
provides unique identifiers and multiplexers cells. This layer is sometimes also known as
service- independent. ATM adaptation layer (AAL) provides proper kinds of translation between
ATM and other services which is involved in transmission. AAL consist of four kinds of classes
which makes use of five protocol and two kinds of sub layers.
The various kinds of classes are
 Class A is generally used for constant bit rate of data which is generally used for
transmission of voice data.
 Class B is used for bit rate at variable instance and appropriate transmission of video
data. Class B makes use of AAL 2 protocol.
 Class C is used for connection based transmission of data. It makes use of AAL 3 or AAL
5 protocol.

5OBJECT MODELLING
 Class D makes use of connectionless data transmission. It makes use of AAL or AAL 5
protocol.
The two kind of sublayers are:
 Convergence layer easily provides interface for various kinds of services.
 Segmentation and reassembly (SAR) sublayer, packages variables sizes which consist of
fixed size cell for transmission and repackages.

6OBJECT MODELLING
Figure 3: Showing sequence diagram of print receipt Collin’s ATM
(Source: Created by author)

7OBJECT MODELLING
The plane generally specifies domain for activity which is present in the protocol. The
planes in the ATM protocol are:
Control plane: Calls and connection are generally established and maintained by control
plane.
User plane: Various kinds of users round the globe makes use of Network and layer
management which generally occurs on the user plane.
Management plane: Network and management layer generally occurs on the
management plane. This particular plane also coordinated the various kinds of planes and
manages resources for the layers.
The ATM protocol consist of two kind of interfaces like UNI and network node interface
(NNI). The UNI generally connects the end user to a particular network through ATM switch or
other devices, supplying various kinds of network access to end users. The NNI connects nodes
within a network each other and provides proper kind of routing.
ATM Cells
ATM cells generally consist of 5-octet header and 48-octate data or section of payload.
The 48-Octet payload is nothing but a SAR protocol data unit (SAR) to which header is
generally attached. Many times most of the bits in the header are used for path and channel
identification. The header also contains a cell of lost priority(CLP) bit and a header error control
(HEC) boundaries. Cells are generally byte-oriented, and a header field can be easily extended
over the byte kind of boundaries. In a cell bit order generally goes from left to right, and across
octets of bit orders goes down as an octet to upwards.

8OBJECT MODELLING
Figure 4: Showing sequence diagram of Money transfer Collin’s ATM
(Source: Created by author)

9OBJECT MODELLING
Standard Support of ATM
 ATM UNI specification supports only two versions that 3.0 and 3.1.
 Request of Comment (RFC) focus on classical internet protocol and Address
based protocol (ARP) for various kinds of ATM.
Architecture of ATM Subsystem
The ATM Subsystem is generally being made up of Software process and hardware
components libraries and services which is inclusive of:
 System level process and various libraries
 Providers of ATM (Asynchronous Transfer Mode)
 Clients of ATM
 Subsystem management for ATM.
 SFC objects for ATM subsystem.
 Hardware for ATM Server Net adapters
System-Level processes and Libraries
ATM Subsystem makes use of shared memory Segment which is provided by QIO
subsystem. It generally helps moving ownership of data of various kinds of data between
process. Subsystem also makes use of QIO based or depended driver/ interrupt handlers which is
used for communication for adapters over the Server Net SAN. The driver generally controls the
Server Net adapters by making use of system library routines which is accessible for each kind of
process that is needed for use in ATM subsystem.

10OBJECT MODELLING
ATM Service providers
ATM (Asynchronous Transfer Mode) generally provides various kinds of processes
which is used by ATM subsystem for sending and receiving data on various kinds of ATM
networks which is attached on the system. TCP or IP is considered to be the only ATM service
provider which is supported at present.
QIO API clients are some kinds of protocols subsystem which establishes communication
with various kinds of ATM service providers. This mainly focus on
 Expansion of connection through QIO application by making use of Application
programming Interface (API) to TCP/IP for providing expansion of IP capability.
 Transmission Control Protocol or Internet protocol provides proper kind of
connectivity to TCP/ IP to a network.

11OBJECT MODELLING
Figure 5: Showing sequence diagram of money deposit Collin’s ATM
(Source: Created by author)