A system for filtering a digital signal transmitted in a protocol featuring multi-level packetization from a first server to a second server. The compounds have a musk odour and are useful in fine and functional fragrances. Moreover, multiple channels of In-phase and Quadrature signals may be transmitted as composite signals to the data acquisition system across a single coaxial cable. The stent of the branch portion includes one or more stent segments, at least one of which is a varying-height stent segment.