mscAtmIfUnshapedTransmitQueueing 1.3.6.1.4.1.562.36.2.1.114.110.1.70

It is migrated in P6.0 to the attributes of the same name under each ATM service category component of the AtmIf CA. This attribute applies only for unshaped VCC and VPC connections. This attribute defines the transmit queueing method for all unshaped connections under this AtmIf. Per-VC queueing means that unshaped connections are treated with the same fairness as shaped queues in the transmit round-robin scheduling. The alternative to per-VC queueing is to use the common queue for a particular service category (medium or low priority). The common queue is only counted as one queue in the transmit round-robin scheduling. Thus, if there are multiple connections which are destined for the common queue, they are not fairly allocated a portion of the transmit bandwidth compared to shaped connections. When this attribute is set to perVc, any unshaped connection is allocated its own per-VC queue, and is treated with the same fairness as any shaped connections. Per-VC queues have a maximum rate of 58,962 cell/s (25 Mbit/s) in a multi-port shaping configuration. Per-VC queues also have their own congestion control level. This means that total number of cell/frame blocks allocated for several per-VC queues are higher than would be allowed on the common queue. This can be an advantage in reducing cell loss due to queue congestion. This attribute may only be set to perVc if the interface supports per-VC queueing, (specified by the perVcQueueInterfaces attribute in the AtmResourceControl component). When this attribute is set to common, any unshaped connection is destined for the common queue. The common queue has one set of congestion control levels for all cells enqueued on it. The common queue is only allocated one queue position when scheduling which queue to transmit from. Due to the possibility of unfairness, this value is only recommended in cases where the configuration cannot otherwise achieve full link utilization. When this attribute is set to autoConfigure and the interface support per-VC queueing (specified by the perVcQueueInterfaces attribute in the AtmResourceControl component) per-VC queueing is enabled for all unshaped connections. Otherwise, the common queue is used. The unshapedTransmitQueueingOper attribute indicates whether the transmit queueing is perVc or common.