78-11719-02 July 2001

Using Cisco Transport Controller 3

Figure 3-21

An ONS 15327 timing example with external, BITS, and internal timing

BITS1 source

BITS2 source

Node 1

Timing External

Ref 1: BITS1

Ref 2: BITS2

Ref 3: Internal (ST3)

Slot 5

Slot 6

Node 4

Slot 6

Slot 5

Node 2

Timing Line

Timing Line

Ref 1: Slot 6

 

 

Ref 1: Slot 5

Ref 2: Slot 5

 

 

Ref 2: Slot 6

Ref 3: Internal (ST3)

 

 

Ref 3: Internal (ST3)

 

Slot 5

Slot 6

 

 

 

 

Slot 6

Slot 5

BITS1 BITS2

out out

Third party equipment

Node 3

Timing Line

Ref 1: Slot 5

Ref 2: Slot 6

Ref 3: Internal (ST3)

34726

Synchronization Status Messaging (SSM) is a SONET protocol that communicates information about the quality of the timing source. SSM messages are carried on the S1 byte of the SONET Line layer. They enable SONET devices to automatically select the highest-quality timing reference and to avoid timing loops.

SSM messages are either Generation 1 or Generation 2. Generation 1 is the first and most widely deployed SSM message set. Generation 2 is a newer version. If you enable SSM for the ONS 15327, consult your timing-reference documentation to determine which message set to use. Table 3-13and Table 3-14show the Generation 1 and Generation 2 message sets.

Table 3-13

SSM Generation 1 Message Set

 

 

 

Message

Quality

Description

 

 

 

PRS

1

Primary reference source - Stratum 1

 

 

 

STU

2

Sync traceability unknown

 

 

 

ST2

3

Stratum 2

 

 

 

ST3

4

Stratum 3

 

 

 

SMC

5

SONET minimum clock

 

 

 

ST4

6

Stratum 4

 

 

 

DUS

7

Do not use for timing synchronization

 

 

 

Cisco ONS 15327 User Documentation

3-37

Page 37
Image 37
Cisco Systems ONS 15327 manual SSM Generation 1 Message Set, Message Quality Description

ONS 15327 specifications

Cisco Systems ONS 15327 is a high-performance optical networking solution tailored for service providers and enterprises looking to enhance their optical communication infrastructure. This versatile platform is recognized for its robust performance, scalability, and flexibility, making it suitable for a wide array of applications ranging from broadband access to metropolitan area networking.

One of the standout features of the ONS 15327 is its ability to handle multiple data types over a single platform. It supports a rich array of protocols, including Ethernet and SONET/SDH, allowing service providers to deliver a diverse portfolio of services to their customers. This multiservice capability simplifies the network architecture, reducing operational complexity and costs.

The ONS 15327 is designed with a modular architecture, which enables operators to customize and scale their network as demand grows. It supports a variety of card options for different media types, wavelengths, and capacity requirements. This modularity not only facilitates straightforward upgrades but also allows for efficient network management.

In terms of technology, the ONS 15327 leverages dense wavelength division multiplexing (DWDM) capabilities to maximize the utilization of available fiber bandwidth. This allows for an impressive increase in transmission capacity without the need for additional fiber installations, making it a cost-effective solution for expanding networks.

Another significant characteristic of the Cisco ONS 15327 is its advanced performance monitoring and management features. Built-in diagnostic tools provide real-time visibility into network performance, enabling prompt identification and troubleshooting of potential issues. This proactive approach to network management enhances service reliability and customer satisfaction.

Security is also paramount in the ONS 15327. The platform integrates various security features and protocols to protect the data traversing the network, ensuring compliance with industry standards and safeguarding sensitive information.

Furthermore, the equipment is designed for easy integration into existing infrastructures. Its compatibility with Cisco’s broader networking solutions allows for seamless interconnection with routers, switches, and other devices, facilitating comprehensive network solutions.

In conclusion, Cisco Systems ONS 15327 stands out as a powerful optical networking platform that combines versatility, scalability, and advanced management features. Its ability to support various protocols and harness optical technologies makes it an essential tool for organizations aiming to optimize their telecommunications infrastructure while minimizing costs and complexity.