Nortel Networks 8683POS User Manual
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Chapter 2 Using the Passport 8683POS Module
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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.
(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.
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.
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).
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).
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.
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: