Cisco ONS 15454 SDH Specifikace stáhnout pdf (Strana 40)

Cisco ONS 15454 SDH Product Overview

Network Configuration

Cisco ONS 15454 SDH Product Overview, R3.4

September 2002

Figure 19 Basic four-node SNCP ring

Multiplex Section–Shared Protection Ring

The ONS 15454 SDH supports two-ﬁber and four-ﬁber MS-SPRings with up to 16

ONS 15454 SDH nodes. MS-SPRings work well for distributed trafﬁc applications,

such as interofﬁce networks.

Two-fiber MS-SPRings allocate half the available fiber bandwidth for protection.

In an STM-16 MS-SPRing, for example, VC4s 1 to 8 carry the working traffic,

and VC4s 9 to 16 are reserved for protection. Working traffic (VC4s 1 to 8) travels

in one direction on the first fiber and in the opposite direction on the second fiber.

You can create STM-4, STM-16, and STM-64 two-fiber MS-SPRings.

Four-fiber MS-SPRings(Figure 20 onpage 41) doublethe bandwidthof two-fiber

MS-SPRings by dedicating a second optical card for protection rather than

reserving half of the active card for protection. If one fiber is cut, the ring does

ONS 15454 SDH

Node A

ONS 15454 SDH

Node B

ONS 15454 SDH

Node C

ONS 15454 SDH

Node D

= Fiber 1

= Fiber 2

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Cisco ONS 15454 SDH Specifikace Strana 40