IP-TV BROADCASTING SERVICE SYSTEM AND METHOD USING PHYSICAL LAYER'S MULTICAST SWITCH

摘要

An IP-TV(Internet Protocol-Television) broadcasting service system and method using a multicast switch of a physical layer are provided to provide a quality image signal, simplify the configuration of network controlling, and duplicate a large number of bundled image signals. A head end(100) converts an ethernet signal into a VCG(Virtual Concatenation Group) signal of an SDH/SONET(Synchronous Digital Hierarchy/Synchronous Optical Network). A multicast switch(120) multicasts the VCG signal from a physical layer. A tail end(110) restores the multicast VCG signal received through an STM-N optical link into the ethernet signal. A GFP(Generic Framing Procedure) mapping unit(104) maps the ethernet signal. A VCAT(Virtual Concatenation)(106) separates a VCG having an allocated requested bandwidth of the ethernet signal at a minimum signal unit of the STM-N. An LCAS(Link Capacity Adjustment Scheme)(112) restores the signal received through the STM-N optical link into the VCG signal. A GFP demapping unit(114) demaps the restored VCG signal to extract the ethernet signal.