Raisecom
Gazelle S1503i (A) User Manual
8
Appendix
Raisecom Technology Co., Ltd.
55
Q
QinQ
802.1Q in 802.1Q (QinQ), also called Stacked VLAN or Double
VLAN, is extended from 802.1Q and defined by IEEE 802.1ad
recommendation. This VLAN feature allows the equipment to add a
VLAN tag to a tagged packet. The implementation of QinQ is to add a
public VLAN tag to a packet with a private VLAN tag, making the
packet encapsulated with two layers of VLAN tags. The packet is
forwarded over the ISP's backbone network based on the public VLAN
tag and the private VLAN tag is transmitted as the data part of the
packet. In this way, the QinQ feature enables the transmission of the
private VLANs to the peer end transparently. There are two QinQ types:
basic QinQ and selective QinQ.
Quality of
Service (QoS)
A network security mechanism, used to solve problems of network
delay and congestion. When the network is overloaded or congested,
QoS can ensure that packets of important services are not delayed or
discarded and the network runs high efficiently. Depending on the
specific system and service, it may relate to jitter, delay, packet loss
ratio, bit error ratio, and signal-to-noise ratio.
R
Rapid
Spanning Tree
Protocol
(RSTP)
Evolution of the Spanning Tree Protocol (STP), which provides
improvements in the speed of convergence for bridged networks
Remote
Authentication
Dial In User
Service
(RADIUS)
RADIUS refers to a protocol used to authenticate and account users in
the network. RADIUS works in client/server mode. The RADIUS server
is responsible for receiving users' connection requests, authenticating
users, and replying configurations required by all clients to provide
services for users.
S
Simple
Network
Management
Protocol
(SNMP)
A network management protocol defined by Internet Engineering Task
Force (IETF) used to manage devices in the Internet. SNMP can make
the network management system to remotely manage all network
devices that support SNMP, including monitoring network status,
modifying network device configurations, and receiving network event
alarms. At present, SNMP is the most widely-used network management
protocol in the TCP/IP network.
Simple
Network Time
Protocol
(SNTP)
SNTP is mainly used for synchronizing time of devices in the network.
Single-mode
fiber
In this fiber, single-mode optical signals are transmitted.
