Cisco ONS 15454 SDH Especificaciones descargar pdf (Pagina 43)

Cisco ONS 15454 SDH Product Overview, R3.4

September 2002

Cisco ONS 15454 SDH Product Overview

Network Configuration

Linear Add/Drop Multiplexer Mode

In a linear ADM configuration, each node has direct access to eastbound or

westbound STM channels at intermediate sites along a fiber route. ADM

configurations eliminate the need for costly back-to-back terminal configurations

and can be enhanced with protection spans for any or all transport spans in the

system. Figure 22 shows an ADM configuration.

Figure 22 Linear ADM conﬁguration

Extended SNCP Mesh Network

With ONS 15454 SDH, you can set up extended SNCP mesh networks (extended

SNCP). Extended SNCP extends the protection scheme of SNCP from the basic

ring configuration to the meshed architecture of several interconnecting rings.

Typical SNCP creates two separate routes between source and destination nodes

on a single SNCP. Extended SNCP does this for source and destination nodes that

are not on the same ring butlink together through a network of connections. When

applied to a single ring, extended SNCP uses the same paths as the SNCP.

Extended SNCP connects the source and destination of a circuit over two diverse

paths through a network of single or multiple meshed rings. These two paths form

a circuit-level SNCP. The source sends traffic on each of the diverse paths to the

destination node, and the destination node uses the active path or switches to the

standby path. CTC can automatically route circuits across the extended SNCP, or

you can manually route circuits.

You can set the level of node diversityfor the extendedSNCP portions of the path.

When CTC calculates the path, it makes sure the computed path traverses the

required set of nodes and links and does not traverse excluded nodes and links.

Users can choose between the following levels:

Node 1

Node 3

Node 2

Slot 6 to Slot 6

Slot 5 to Slot 5

Slot 12 to Slot 12

Slot 13 to Slot 13

Working Path

Protect Path

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Cisco ONS 15454 SDH Especificaciones Pagina 43