Riverstone Networks RS 2100 Spezifikationen PDF herunterladen (Seite 114)

Glossary

114 Continuous Access and Data Replication Manager SAN Extensions Reference Guide

single-mode fiber (SMF)

Optical fiber designed to allow just a single path of light through the core. The core for a

single-mode fiber is extremely thin—less than 10 microns, which makes the signal extremely

clean.

small form factor pluggable (SFP) GBIC

A standard transceiver with specified dimensions that converts electrical signals used by Fibre

Channel devices for transmission over either optical or copper media. SFPs are hot swappable.

Optical SFPs use LC connectors.

speed of light through fiber

Approximately 200,000 kilometers per second or 5 microseconds to traverse one kilometer.

subnet mask

Also known as address mask. An IP network that can be reached through a single IP address.

All the members of the subnet share the mask value. Members of the subnet can then be

referenced more easily. A subnetwork is a network that is part of another network, connected

through a gateway, bridge, or router.

Synchronous Digital Hierarchy (SDH)

An international digital telecommunications network hierarchy that standardizes transmission

around the bit rate of 51.84 megabits per second, which is also called STS-1. SDH is the

European counterpart to SONET.

synchronous mode

A mode of operation of the remote copy set where the data is written simultaneously to the

cache of the local subsystem and the cache of the remote subsystem. The I/O completion status

is returned to the sender after the I/O is in the cache at both sites.

See also asynchronous mode.

Synchronous Optical Network (SONET)

A broadband networking standard (ANSI T1.105) based on point-to-point optical fibre

networks. SONET is the American version of SDH.

time division multiplexing (TDM)

A technology that combines several slow-speed transmission channels into one high-speed

transmission channel. Each low-speed channel is located in a time slot.

topology

An interconnection scheme that allows multiple Fibre Channel ports to communicate. For

example, point-to-point, arbitrated loop, and switched fabric are all Fibre Channel topologies.

Transmission Control Protocol over Internet Protocol (TCP/IP)

A language governing communications among all computers on the Internet.

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Riverstone Networks RS 2100 Spezifikationen Seite 114