The resulting output of the QAM transmitter is QAM signal with carrier frequency of 1800 Hz and symbol rate of 2400 baud giving an information rate of 2400 x 4bits = 9600 b/s = 9.6 kb/s to be sent over 32 kb/s ADPCM link in cascade with telephone channel
. The output of QAM transmitter firstly passes through 32 kb/s ADPCM codec [the detail of ADPCM codec is found in (CCITT Recommendation G.721, 1984)].
"We might expect respondents to answer diplomatically that all channels give a similar response, but the reality is - as most customers already know - the telephone channel
is still most likely to give the best service.
In some jurisdictions the traditional telephone channel
has evolved into call centres, and that these are developing into "contact" centres involving the convergence of telephone calls with such channels as email, fax, letters and Voice over Internet Protocol (VoIP).
"Now, we can have a debate as to whether that has worked as the years have gone on in terms of improving customer service, but they all wanted to launch this telephone channel
First, our telephone channel
is ramping faster than we previously estimated due to favorable responses from consumers to our introductory advertising campaign.
Because we've had the telephone channel
, a CD-ROM and the web - and we're also now planning to offer home shopping through digital TV in the first quarter of 2002 - we've been trying to ensure the business logic is all in one place, with presentation layers for each of the channels.
If the PIN is valid, the system then measures the telephone channel
noise and prompts the caller for a password.
In addition, it must be taken into account that until now, performance objectives were based on bit errors of a 64 kb/s bit stream as defined by ITU-R Recommendation G821s, which is the PCM equivalent of a telephone channel
. Because SDH is used for the transmission of different bit rates framed in different virtual containers (VCx) with their control overhead bytes, a different performance criterion based on errored blocks is necessary to be more consistent.
A marketer's success using the telephone channel
depends heavily on the effectiveness of the representatives' communication.