Chapter 8 SONET Topologies and Upgrades

8.3.3 BLSR Bandwidth

Figure 8-7 Four-Fiber BLSR Ring Switch

Node 0

Span 4

Span 5

Span 8

Node 3

OC-48 Ring

Span 6

Span 7

Span 3

Node 2

Span 1

Node 1

Span 2

= Working fibers = Protect fibers

131784

8.3.3 BLSR Bandwidth

BLSR nodes can terminate traffic coming from either side of the ring. Therefore, BLSRs are suited for distributed node-to-node traffic applications such as interoffice networks and access networks.

BLSRs allow bandwidth to be reused around the ring and can carry more traffic than a network with traffic flowing through one central hub. BLSRs can also carry more traffic than a path protection operating at the same OC-N rate. Table 8-1shows the bidirectional bandwidth capacities of two-fiber BLSRs. The capacity is the OC-N rate divided by two, multiplied by the number of nodes in the ring minus the number of pass-through STS-1 circuits.

Table 8-1

Two-Fiber BLSR Capacity

 

 

 

 

 

OC Rate

Working Bandwidth

Protection Bandwidth

Ring Capacity

 

 

 

 

OC-48

STS 1-24

STS 25-48

24 x N1 – PT2

OC-192

STS 1-96

STS 97-192

96 x N – PT

 

 

 

 

1.N equals the number of ONS 15600 nodes configured as BLSR nodes.

2.PT equals the number of STS-1 circuits passed through ONS 15600 nodes in the ring (capacity can vary depending on the traffic pattern).

Table 8-2shows the bidirectional bandwidth capacities of four-fiber BLSRs.

Cisco ONS 15600 Reference Manual, R7.2

8-8

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Cisco Systems ONS 15600 manual Blsr Bandwidth, OC-48 STS N 1 PT OC-192 N PT
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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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