Chapter 9 Management Network Connectivity

9.7.3 OSI Connectionless Network Service

CLNP uses network service access points (NSAPs) to identify network devices. The CLNP source and destination addresses are NSAPs. In addition, CLNP uses a network element title (NET) to identify a network-entity in an end system (ES) or intermediate system (IS). NETs are allocated from the same name space as NSAP addresses. Whether an address is an NSAP address or a NET depends on the network selector value in the NSAP.

The ONS 15600 supports the ISO Data Country Code (ISO-DCC) NSAP address format as specified in ISO 8348. The NSAP address is divided into an initial domain part (IDP) and a domain-specific part (DSP). NSAP fields are shown in Table 9-9. NSAP field values are in hexadecimal format. All NSAPs are editable. Shorter NSAPs can be used. However NSAPs for all NEs residing within the same OSI network area usually have the same NSAP format.

Table 9-9 NSAP Fields

Field

Definition

Description

 

 

 

IDP

 

 

 

 

 

AFI

Authority and

Specifies the NSAP address format. The initial value is 39 for the

 

format identifier

ISO-DCC address format.

 

 

 

IDI

Initial domain

Specifies the country code. The initial value is 840F, the United States

 

identifier

country code padded with an F.

 

 

 

DSP

 

 

 

 

 

DFI

DSP format

Specifies the DSP format. The initial value is 80, indicating the DSP

 

identifier

format follows American National Standards Institute (ANSI)

 

 

standards.

 

 

 

ORG

Organization

Organization identifier. The initial value is 000000.

 

 

 

Reserved

Reserved

Reserved NSAP field. The Reserved field is normally all zeros (0000).

 

 

 

RD

Routing domain

Defines the routing domain. The initial value is 0000.

 

 

 

AREA

Area

Identifies the OSI routing area to which the node belongs. The initial

 

 

value is 0000.

 

 

 

Cisco ONS 15600 Reference Manual, R7.2

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Cisco Systems ONS 15600 manual Field Definition Description
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ONS 15600 specifications

Cisco Systems ONS 15600 is a highly versatile optical networking platform designed to meet the demands of modern telecommunications and data services. This multiservice edge platform supports various transmission mediums and offers a wide array of features that enable efficient data transport. Ideal for service providers and large enterprises, the ONS 15600 is engineered to provide scalable and reliable optical transport solutions.

One of the notable features of the ONS 15600 is its capability to support multiple protocols, including SONET/SDH, Ethernet, OTN, and legacy TDM services. This flexibility allows users to tailor their networks according to specific service requirements while ensuring interoperability with existing infrastructure. The platform is designed to facilitate seamless service migration, accommodating both legacy and next-generation services.

The modular architecture of the ONS 15600 enhances its scalability. It allows for easy expansion by incorporating additional line cards or interface modules without requiring significant downtime. This modularity ensures that service providers can evolve their networks over time, responding to increasing bandwidth demands and new service offerings with ease.

Incorporating advanced technologies, the ONS 15600 employs Dense Wavelength Division Multiplexing (DWDM), significantly increasing the capacity of fiber networks by allowing multiple signals to be transmitted simultaneously over a single optical fiber. This capability helps to optimize fiber utilization and reduce operational costs. In addition, the platform supports Optical Transport Network (OTN) for improved error detection and correction, contributing to higher reliability and performance.

Another key characteristic of the ONS 15600 is its robust management capabilities. The platform can be managed through Cisco's Optical Networking Manager (ONM), providing a centralized interface for network configuration, monitoring, and troubleshooting. This enhances operational efficiency and minimizes downtime, allowing service providers to focus on delivering quality services to their customers.

The ONS 15600 also prioritizes security, offering various features like encryption and access control to safeguard sensitive data during transmission. With its combination of scalability, flexibility, and security, the Cisco ONS 15600 stands out as a reliable choice for organizations looking to enhance their optical networking capabilities while meeting the evolving demands of the digital landscape. Its commitment to quality and performance makes it a cornerstone of modern optical networks.
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