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L
L
L
L
S
S=Approx.1km
Fig. A-18 Loading cable
(2) Attenuation distortion
"Attenuation distortion" is the distortion that occurs as a result of inconsis-
tent transmission loss in the required frequency band.
Attenuation distortion occurs between EOs (end offices) and on non-
loaded subscriber lines. Humps may occur in the attenuation characteris-
tics of the subscriber line due to impedance mismatching.
Attenuation distortion occurs does not cause special problems in telephone
conversations. However, in the case of G3 facsimile transmission, image
signals can no longer be received properly and errors occur frequently if
the distortion is significant.
15
10
5
0
0
Fig. A-20 Attenuation Characteristics between EOs
4
L
3
L
2
1
S
Fig. A-19 Attenuation
Characteristics of Non-loading
7
5
3
1
0.3
1.0
2.0
Frequency (kHz)
[Note] Numbers inside the graph indicate the
number of links in the case of the
organization below (Figure A-20).
EO
TC
DC
RC
7 link
EO
TC
DC
DC
5 link
EO
TC
TC
EO
3 link
EO
EO
1 link
L (Loading)
0
1
2
3
4
Frequency (kHz)
Cable
7
5
3
1
3.0
3.4
RC
DC
TC
EO
TC
EO
A–23
1
2
5
3
4
5
6
A
çi
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