----- Original Message -----
From: "Owen DeLong" <owen@delong.com>
Many DACS have provision for "monitoring" circuits and feeding the data off to a third circuit in an undetectable manner.
The DACS question wasn't about DACS owned by the people using the circuit, it was about DACS inside the circuit provider. When you buy a DS1 that goes through more than one CO in between two points, you're virtually guaranteed that it goes through one or more of {DS-3 Mux, Fiber Mux, DACS, etc.}. All of these are under the control of the circuit provider and not you.
Correct, and they expand the attack surface in ways that even many network engineers may not consider unless prompted. Cheers, -- jra -- Jay R. Ashworth Baylink jra@baylink.com Designer The Things I Think RFC 2100 Ashworth & Associates http://baylink.pitas.com 2000 Land Rover DII St Petersburg FL USA #natog +1 727 647 1274