# What is the difference between noiseless and AWGN channels in terms of channel capacity?

What is the difference between noiseless and additive white Gaussian noise (AWGN) channels in terms of channel capacity?

• Can you add some context & spell out your acronyms? I don't know if people will be able to answer your question as stated. – gung Jan 23 '15 at 23:15
• A noiseless channel has infinite capacity at all temperatures. An additive white Gaussian channel also can have infinite capacity but only at a temperature of absolute zero $-273.15\ldots^{\circ} K$. – Dilip Sarwate Jan 28 '15 at 23:47