Digital Signal Processing Reference
In-Depth Information
Composition of a
Primary basic group
(12 channels) from 60 to 108 kHz
Ba sic m o dulatio n carrier
Ch 1
Ch 2
Channel filter
48 - 52 kHz
112
120
128
136
144
152
Ch 12
116
114
132
140
148
156
60 kHz Primary basic group
108 kHz
Composition of a
Secondary basic group
(60 channels) consisting of 5 Primary basic groups
Frequ en cy scale
changed
PG 1
420 kHz
60 108
kHz
PG 2
468 kHz
PG 3
516 kHz
564 kHz
PG 4
PG 5
612 kHz
Secondary basic group
312 kHz
552 kHz
Composition of a
Tertiary basic group
(300 channels) consisting of 5 Secondary basic groups
1364 kHz
312 kHz
552 kHz
Frequ en cy scale
changed
1612 kHz
1860kHz
2108 kHz
2356 kHz
812 kHz Tertiary basic group
2044kHz
Composition of a
Quaternary basic group
(900 channels) consisting of 3 Tertiary basic groups
Freq ue ncy scale
ch ang ed
812 kHz
2044 kHz
11156kHz
8516 kHz
9836 kHz
12388 kHz
Composition of a
10800 channel system
consisting of 12 Quaternary basic groups
Fre que ncy sca le
changed
8516
12388 kHz
68200kHz
4032 kHz
59684kHz
Illustration 165:
Principle of the frequency staggering by forming groups in TF systems
This representation shows the structure of a V 10800 system. It makes it possible to transmit 10800
telephone channels simultaneously via a coaxial cable and at the same time represents the high point and
conclusion of analog transmission technology. Future transmission systems will be founded purely on
digital technology. They will exploit the fantastic possibilities of digital signal processing (DSP), which
will be discussed in following chapters.
