ding to 37) The accepts the multiplexed data stream, separates the data accor channel, and delivers data to the appropriate output lines A) high capacity fiber B) coaxial link C) multiplexer D) demultiplexer 38) SNR (signal to noise ratio) can be measured with respect to A) Avg frequency /Avg noise power B) Avg distortion amount /Avg noise power C) Avg attenuation /Avg noise power D) Avg signal power/Avg noise power 39) The data link layer needs to pack bits into A) packets B) bunches D) bundles C) frames 40) In order to improve the efficiency of bidirectional transmission, a frame carries control information as well as data, this is called: A) piggybacking B) translational packeting C)full-backing D)superior pipelining