Cisco ONS 15454 SDH Especificaciones descargar pdf (Pagina 45)

Cisco ONS 15454 SDH Product Overview, R3.4

September 2002

Cisco ONS 15454 SDH Product Overview

Timing

If you check the Fully Protected Path check box in CTC, extended SNCP

establishes a second unique route between Nodes 3 and 9 and automatically

creates cross-connections at Nodes 3, 2, 1, 11, and 9, shown by the dashed line. If

a signal failure occurs on the primary path, traffic switches to the secondary,

protect circuit path. In the example, Node 9 stops receiving traffic from Node 7

and starts receiving traffic from Node 11. Service resumes within 50 milliseconds.

Extended SNCP also allows spans of different SDH line rates to be mixed together in

virtual rings. Figure 24 shows Nodes 1, 2, 3, and 4 in a standard STM-16 ring. Nodes

5, 6, 7, and 8 link to the backbone ring through STM-4 ﬁber. The virtual ring formed

by Nodes 5, 6, 7, and 8 uses both STM-16 and STM-4.

Figure 24 Extended SNCP virtual ring

Timing

The TCC-I card performs all system-timing functions for each ONS 15454 SDH.

The TCC-I card selects a recovered clock, a building integrated timing supply

(BITS), or an internal Stratum 3E reference as the system-timing reference. You

STM-16 SNCP

STM-4STM-4

ONS 15454 SDH

Node 5

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Node 1

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Node 6

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Node 2

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Node 4

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Node 8

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Node 3

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Node 7

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Cisco ONS 15454 SDH Especificaciones Pagina 45