TELOS TWOX12 USER’S MANUAL
INTRODUCTION
CHAPTER 1 5
the two audio paths in order to add gain in each direction. When the gain around the
loop exceeds unity, the unpleasant result is feedback. Since the conference path
usually includes four AGC functions, the hybrid must be sufficiently good to cover
the additional gain that may be dynamically inserted by these AGC’s.
Because of the 4-wire nature of digital telephone lines, the hybrid function is more
effective–and more reliably so across a variety of calls. That means more gain can be
inserted between calls before feedback becomes a problem.
Better Line Monitoring, Call Setup and Supervision.
Since there is a full-time connection between the central office and the terminal on
the D channel, it is possible to detect when a line is a not working. On an analog line,
one discovers a problem only from a failed attempt to use the line. Many digital
phone lines maintain a full-time connection between the Central Office and your
studio on the “D” channel, so you can quickly detect when a line is a not working.
Furthermore, the sophisticated transactions on the “D” channel keep both ends of a
call accurately informed about line status. For starters, digital lines feature call set-up
times of only a few milliseconds, enhancing production of a fast-paced show.
Perhaps more importantly, when a caller disconnects while waiting on hold, this
status change is communicated instantly (contrasted with the usual 11-second delay
on most analog lines). One of the most common complaints of talk hosts is that they
go to a line where they expect a caller to be waiting, only to be met with a blaring,
annoying dial tone. The chance of this happening with a digital line is near zero.
Elimination of A-to-D & D-to-A conversions.
The analog-digital conversion equipment used in telephone central offices is of poor
quality compared to the converters used in professional audio equipment. Using a
digital phone line enables you to maintain a digital path all the way from the caller’s
central office to your studio equipment — requiring only the initial conversion to
digital, and doing away with the need to reconvert from digital to analog audio.
AES/EBU outputs are provided on TWOx12 Talk Show System to help accomplish
this direct connection to digital studio gear.
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