User manual

Publication date: Feb., 2013
Revision A3
273
A communications network transports a multitude of applications and data, including high-
quality video and delay-sensitive data such as real-time voice. Networks must provide secure,
predictable, measurable, and sometimes guaranteed services.
Achieving the required QoS becomes the secret to a successful end-to-end business solution.
Therefore, QoS is the set of techniques to manage network resources.
R
RARP
RARP is an acronym for Reverse Address Resolution Protocol. It is a protocol that is used to
obtain an IP address for a given hardware address, such as an Ethernet address. RARP is
the complement of ARP.
RADIUS
RADIUS is an acronym for Remote Authentication Dial In User Service. It is a networking
protocol that provides centralized access, authorization and accounting management for
people or computers to connect and use a network service.
RDI
RDI is an acronym for Remote Defect Indication. It is an OAM functionality that is used by a
MEP to indicate defect detected to the remote peer MEP
RSTP
In 1998, the IEEE with document 802.1w introduced an evolution of STP: the Rapid Spanning
Tree Protocol, which provides for faster spanning tree convergence after a topology change.
Standard IEEE 802.1D-2004 now incorporates RSTP and obsoletes STP, while at the same
time being backwards-compatible with STP.
S
SHA
SHA is an acronym for Secure Hash Algorithm. It designed by the National Security Agency
(NSA) and published by the NIST as a U.S. Federal Information Processing Standard. Hash
algorithms compute a fixed-length digital representation (known as a message digest) of an
input data sequence (the message) of any length.
Shaper
A shaper can limit the bandwidth of transmitted frames. It is located after the ingress queues.
SMTP
SMTP is an acronym for Simple Mail Transfer Protocol. It is a text-based protocol that uses
the Transmission Control Protocol (TCP) and provides a mail service modeled on the FTP file
transfer service. SMTP transfers mail messages between systems and notifications regarding
incoming mail.
SNAP
The SubNetwork Access Protocol (SNAP) is a mechanism for multiplexing, on networks using
IEEE 802.2 LLC, more protocols than can be distinguished by the 8-bit 802.2 Service Access
Point (SAP) fields. SNAP supports identifying protocols by Ethernet type field values; it also
supports vendor-private protocol identifier.
SNMP
SNMP is an acronym for Simple Network Management Protocol. It is part of the Transmission