Configuring Cpos Interfaces; Overview; Sonet/Sdh; Cpos - HP HSR6800 Configuration Manual

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Configuring CPOS interfaces

Synchronous Optical Network (SONET), a synchronous transmission system defined by the American

National Standards Institute (ANSI), is an international standard transmission protocol. It adopts optical

transmission.

Synchronous Digital Hierarchy (SDH) is defined by the Consultative Committee for International

Telegraph and Telephone (CCITT), today's Telecommunication Standardization Sector of the

International Telecommunication Union (ITU-T). Because SDH uses synchronous multiplexing and a

flexible mapping structure, low-speed tributary signals can be added to and dropped from SDH signals

without a large number of multiplexing/demultiplexing devices. This reduces signal attenuation and

investment in devices.

The low-speed tributary signals multiplexed to form an SDH signal are called channels. The channelized

POS (CPOS) interface makes full use of SDH to provide precise bandwidth division, reduce the number

of low-speed physical interfaces on devices, enhance their aggregation capacity, and improve the

access capacity of leased lines.

The CPOS interface operates at the rate of STM- 1 or STM- 1 6.

To understand the benefits of CPOS, understand the frame structure of SDH signal STM-N first.

Low-speed tributary signals should distribute in one frame regularly and evenly for the convenience of

adding them to or dropping them from high-speed signals. The ITU-T stipulates that STM-N frames adopt

the structure of rectangle blocks in bytes, as illustrated in

Figure 6 STM-N frame structure

Figure

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