Nortel Networks 8683POS Manual de usuario descargar pdf (Pagina 30)

30 Chapter 2 Using the Passport 8683POS Module

209564-A

SONET terms and acronyms

This section provides a brief listing of common Synchronous Optical Network

(SONET) terms. SONET is a medium for transmitting data that uses fiber-optic

cables.

The following terms and acronyms are frequently used with SONET information:

• SONET: Synchronous Optical Network. SONET is a family of fiber optic

transmission rates that provides the flexibility to transport many digital

signals with different capacities. This ANSI standard provides for

transmission from OC-1 to OC-48 and greater.

• SDH: Synchronous Digital Hierarchy. SDH is a standard technology for

optical fiber-based synchronous data transmission. SDH is the international

equivalent of SONET.

• OC-3c/STM-1: Optical Carrier-level 3 concatenation. OC-3c/STM-1 is an

optical fiber transmission system that carries STS-3c/STM-1 frame structures

at 155 Mb/s. Concatenation refers to the fact that there is only one logical data

stream (rather than supporting a channelized structure).

• OC-12c/STM-4: Optical Carrier-level 12 concatenation. OC-12c/STM-4 is an

optical fiber transmission system that carries STS-12c/STM-4 frame

structures at 622 Mb/s. Concatenation refers to the fact that there is only one

logical data stream (rather than supporting a channelized structure).

• POS: Packet over SONET.

• PPP: Point-to-Point Protocol. PPP encapsulates common network-layer

protocols in specialized Network Control protocol packets, such as IP over

PPP (IPCP) and IPX over PPP (IPXCP), and BCP. Thus, it enables sending

multiprotocol data over point-to-point links.

SONET/SDH transmission rates

The following transmission rates are commonly used with SONET:

• OC-3c/STM-1: 155.52 Mb/s

• OC-12c/STM-4: 622.08 Mb/s

The SONET specification defines optical both as:

1 2 ... 25 26 27 28 29 30 31 32 33 34 35 ... 153 154

Sin comentarios

Nortel Networks 8683POS Manual de usuario Pagina 30