In this paper, we compare two SNR scalable video codecs. The rst codec (CODEC1) is a three-layer single-pass quantization algorithm based on H.263 and extends the work presented in [1, 2]. The second codec (CODEC2) implements three layer SNR scalability as described in Annex O of the H.263 standard by requantizing the DCT coe cients of the encoding error using ner quantizers than those used in ...

Ethernet is becoming one of the dominant aggregation technologies for carrier transport networks. Because it is a LAN technology, native bridged Ethernet does not fulfil all carrier requirements. Several schemes have been proposed to allow Ethernet to fulfil such requirements. Carrier Ethernet technologies rely on domain-wide or local label-based forwarding, although some of them use a smaller ...