Dynamix DC – 16 S/SA 16 ports SHDSL DSLAM modem/router
User Manual
Unit of information from an upper-layer protocol that defines a service request to a
lower-layer protocol.
Signal Noise Ratio (SNR)
This is a DSL transmission parameter, measured in dB, which indicates the Signal-to-
Noise (S/N) ratio at a receiver point.
SNAP
Subnetwork Access Protocol. Internet protocol that operates between a network entity
in the subnetwork and a network entity in the end system. SNAP 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 subnetwork and
performs three key functions: data transfer, connection management, and QoS
selection.
SNMP (Simple Network Management Protocol)
Simple Network Management Protocol. The network management protocol used
almost exclusively in TCP/IP networks. SNMP provides a means to monitor and
control network devices, and to manage configurations, statistics collection,
performance, and security.
VC
Logical circuit created to ensure reliable communication between two network devices.
A virtual circuit is defined by a VPI/VCI pair, and can be either permanent (PVC) or
switched (SVC). Virtual circuits are used in Frame Relay and X.25. In ATM, a virtual
circuit is called a
virtual channel
.
VID
VLAN ID. The identification of the VLAN, which is used by the standard 802.1Q. Being
on 12 bits, it allows the identification of 4096 VLANs.
VLAN
Virtual LAN. Group of devices on one or more LANs that are configured (using
management software) so that they can communicate as if they were attached to the
same wire, when in fact they are located on a number of different LAN segments.
Because VLANs are based on logical instead of physical connections, they are
extremely flexible.
