Best effort service that does not require tightly constrained delay and delay variation. UBR provides no specific quality of service or guaranteed throughput.
An economical best-effort class of service, without a guaranteed performance level.
a type of traffic that is not considered time-critical (e.g., ARP messages, pure data), allocated whatever bandwidth is available at any given time. UBR traffic is given a "best effort" priority in an ATM network with no guarantee of successful transmission.
Unspecified Bit Rate. A service class in ATM that is allocated the remaining bandwidth after all prioritized services get their bandwidths. UBR is used for best-effort services such as Web-browsing, e-mail, and file transfer. Also see ATM.
See Unspecified Bit Rate.
Unspecified Bit Rate. One of five service categories defined by the ATM Forum for ATM.
UNSPECIFIED BIT RATE. An ATM service category that is used for data traffic such as TCP/IP,which can tolerate delays. UBR does not reserve any bandwidth for a connection.
An asynchronous transfer mode (ATM) service category, defined by the ATM Forum, that provides no service guarantees and therefore is a "best effort" service equivalent to a shared-media LAN.
Unspecified Bit Rate. A quality of service defined by the ATM Networks/ATM Forum, allowing any amount of data up to a set maximum to be sent across a network; non-time sensitive data that could be retransmitted without significant inconvenience. Does not guarantee freedom from delay or cell loss.
Unspecified Bit Rate. An ATM traffic type that is equivalent to "Best Effort". UBR is defined by its Peak Rate.
Unspecified Bit Rate: UBR is an ATM service category which does not specify traffic related service guarantees. Specifically, UBR does not include the notion of a per-connection negotiated bandwidth. No numerical commitments are made with respect to the cell loss ratio experienced by a UBR connection, or as to the cell transfer delay experienced by cells on the connection.
Unspecified Bit Rate. The UBR service class is intended for delay-tolerant or non-real-time applications, or those which do not require tightly constrained delay and delay variation.
Unspecified Bit Rate. An ATM service type in which the ATM network makes a "best effort" to meet the transmitter's bandwidth requirements; essentially a "send and pray" service like that available from today's networks.
unspecified bit rate. QOS class defined by the ATM Forum for ATM networks. UBR allows any amount of data up to a specified maximum to be sent across the network, but there are no guarantees in terms of cell loss rate and delay. Compare with ABR (available bit rate), CBR, and VBR.
An ATM service class that provides best-effort service. UBR offers no service guarantee, so you would use it for text data, image transfer, messaging, and distributing information that's noncritical, where you don't have to have a set response time or service guarantee.