Huawei University of Oslo ETH Zurich ETH Zurich Vodafone Group This document defines a PHB (Per-Hop Behavior) group called Latency Loss Tradeoff (LLT). The LLT group is intended to provide delivery of IP packets in two classes of services: a low-loss service (Lo service) and a low-latency service (La service). The LLT group enables an application to request treatment for either low-loss or low-latency at a congested network link.