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<font face="Verdana, Arial" size="2">Originally posted by hbiss:
As far as real advantages, all I can think of is that most so called "digital" systems use one pair for each station as opposed to the much inferior "non-digital" [Linked Image from sundance-communications.com] which uses two. A single pair can be used because the audio signal is not analog however the disadvantage is that you cannot use standard T/R devices but there are ways around this with some systems.
-Hal

[This message has been edited by hbiss (edited March 27, 2005).]</font>

Hey HBiss, can you explain what you mean about analogue needing two pairs a haven't come across that before?. I work on both Siemens and Alcatel systems and it is all single pair, whether it is a digital line or analogue line coming out of the PBX.
Same as our POTS service here is single pair as well.