Panasonic 1200N manual Smds, Smf, Snap, Snc

Glossary S

SMDS

Switched Multi-Megabit Data Services: A connectionless service used to connect

LANs, MANs and WANs to exchange data.

SMF

Single Mode Fiber: Fiber optic cable in which the signal or light propagates in a single mode or path. Since all light follows the same path or travels the same distance, a transmitted pulse is not dispersed and does not interfere with adjacent pulses. SMF fibers can support longer distances and are limited mainly by the amount of attenuation. Refer to MMF.

SN

Sequence Number: A 4 octet field in a Resource Management cell defined by the ITU-T in recommendation I.371 to sequence such cells. It is not used for ATM Forum ABR. An ATM switch will either preserve this field or set it in accordance with I.371.

SN cell

Sequence Number Cell: A cell sent periodically on each link of an AIMUX to indicate how many cells have been transmitted since the previous SN cell. These cells are used to verify the sequence of payload cells reassembled at the receiver.

SNA

Systems Network Architecture: IBM's seven layer, vendor specific architecture for data communications

SNAP

Standard Network Access Protocol: A version of the IEEE local area network logical link control frame similar to the more traditional data link level transmission frame that lets you use nonstandard higher-level protocols. The Subnet Access Protocol is an Internet protocol that operates between a network entity in the subnet and a network entity in the end system and specifies a standard method of encapsulating IP datagrams and ARP messages on IEEE networks.The SNAP entity in the end system makes use of the services of the subnet and performs three key functions: data transfer, connection management, and quality of services selection.

SNC

Subnetwork Connection: In the context of ATM, an entity that passes ATM cells transparently, (i.e., without adding any overhead). A SNC may be either a stand- alone SNC, or a concatenation of SNCs and link connections.

Centillion 1200N ATM Switch User Manual	B-69
NTP 297-8103-903