Operational Support Systems (OSS) are crucial communication systems used by telecommunications providers for network management, alongside Business Support Systems (BSS). OSS encompasses functions like network inventory, service provisioning, network configuration, and fault management, defining a structured architecture over four key elements: processes, data, applications, and technology. The architecture also consists of various management levels: Element Management Level (EML), Network Management Level (NML), Service Management Level (SML), and Business Management Level (BML), each with distinct responsibilities in overseeing telecommunications operations.

1. OSS
Operations or Operational Support System

2.  These are the communication system used by telecommunication service providers to
manage their networks.
 Together with business support system (BSS), they are used to support various end-
to-end telecommunication services. The two systems together are often abbreviated
OSS/BSS, BSS/OSS or simply B/OSS.
 OSS support management functions such as
 Network inventory.
 Service provisioning.
 Network configuration.
 Fault Management.
 Network Inventory:
Inventory or stock refers to the goods and materials include that a business holds for
the ultimate purpose of resale (or repair).

3.  The scope of inventory management also concerns
 carrying costs of inventory
 asset management
 inventory forecasting
 future inventory price forecasting
 physical inventory
 available physical space for inventory
 quality management
 replenishment
 returns and defective goods and demand forecasting and etc.,
 Service provisioning:
 In telecommunication ,provisioning involves the process of preparing and equipping a
network to allow it to provide(new)service to its users.
 Network configuration:
 Configuration management (CM) is a systems engineering process for establishing and
maintaining consistency of a product's performance, functional and physical attributes
with its requirements, design and operational information throughout its life.
 CM, when applied over the life cycle of a system, provides visibility and control of its
performance, functional and physical attributes.
1. Configuration identification
2. Configuration control
3. Configuration status accounting
4. Configuration audits

4.  Fault management:
 It is the set of functions that detect, isolate, and correct malfunctions in a
telecommunications network, compensate for environmental changes.
 Includes maintaining and examining error logs, accepting and acting on error
detection notifications.
A lot of the work on OSS has been centered on defining its architecture. Put simply, there are 4 key
elements of OSS:
• Processes:
• The sequence of events.
• Data:
• The information that is acted upon.
• Applications:
• The components that implement processes to manage data.
• Technology:
• How we implement the applications.

5. During the 1990s, new OSS architecture definitions were done by the ITU
Telecommunication Standardization Sector(ITU-T)
• Element Management Level (EML)
• Network Management Level (NML)
• Service Management Level (SML)
• Business Management Level (BML)
Element Management Level (EML):
• This is responsible for all systems that provide direct control and management of DISN elements.
• The EMS collects, consolidates, and normalizes fault, performance, and configuration data from
network elements and transmits the data to the Network Management System (NMS).
Network Management Level (NML):
This system provides a unified operational view of the DISN that includes: network event management,
network performance management, problem management, network service reporting.
• The Integrated Network Management System (INMS)
• The Reports Management System (RMS)
• The Trouble Management System (TMS)
• The Network Change and Configuration Management (NCCM) System

6. Service Management Level (SML):
• Service Management applications allow greater interaction between OSS and BSS
processes when the service order and fulfillment process is complex. If a service order
comprises multiple technical resources, which are delivered by multiple OSS systems,
Service Management is responsible for orchestrating the fulfilment process and keeping the
customer-facing team informed about progress, changes or deliver issues.
Business Management Level (NML):
• he Business Management layer is responsible for the management of the whole enterprise.
This layer has a broad scope; communications management is just a part of it. Business
management can be seen as goal setting, rather than goal achieving. For this reason
business Management can better be related to strategical and tactical management, instead
of operational management.

7. THANK YOU