8520-R1 4-Port Wireless N Gateway
125
SNAP:
SubNetwork Attachment Point.
SNMP:
Simple Network Management Protocol: Used to govern network management and monitor devices
on the network. SNMP is formally described in RFC 1157.
SNR:
Signal-to-Noise Ratio: Measured in decibels, SNR is a calculated ratio of signal strength to background
noise. The higher this ratio, the better the signal quality.
Subnet Mask:
Short for SubNetwork Mask, subnet mask is a technique used by the IP protocol to filter
messages into a particular network segment, called a subnet. The subnet mask consists of a binary pattern
that is stored in the client computer, server, or router. This pattern is compared with the incoming IP address
to determine whether to accept or reject the packet.
TCP:
Transfer Control Protocol: Works together with Internet Protocol for sending data between computers
over the Internet. TCP keeps track of the packets, making sure that they are routed efficiently.
TFTP:
Trivial File Transfer Protocol: A simple version of FTP protocol that has no password authentication or
directory structure capability.
Trellis Code:
An advanced method of FEC (Forward Error Correction). When enabled, it makes for better
error checking at the cost of slower packet transmission. Setting Trellis Code to Disabled will cause increased
packet transmission with decreased error correction.
TTL:
Time To Live: A value in an IP packet that indicates whether or not the packet has been propagating
through the network too long and should be discarded.
UBR:
Unspecified Bit Rate: A transfer mode that is usually used in file transfers, email, etc. UBR can vary
depending on the data type.
USB:
Universal Serial Bus: A standard interface between a computer and a peripheral (printer, external
drives, digital cameras, scanners, network interface devices, modems, etc.) that allows a transfer rate of
12Mbps.
UDP:
User Datagram Protocol: A protocol that is used instead of TCP when reliable delivery is not required.
Unlike TCP, UDP does not require an acknowledgement (handshake) from the receiving end. UDP sends
packets in one-way transmissions.
VBR-nrt:
Variable Bit Rate
– non real time: With VBR-nrt, cell transfer is variable upon certain criteria.
VC:
Virtual Circuit: A virtual circuit is a circuit in a network that appears to be a physically discrete path, but is
actually a managed collection of circuit resources that allocates specific circuits as needed to satisfy traffic
requirements.
