Chapter 10 Principle of Operation
10.8 Other Problems
10-18
10.8 Other Problems
â– Branch Connection (Parallel Connection)
During FAX reception, if the handset of another telephone on a branch connection is lifted, the received
image may be corrupted or a transmission error may occur. Branch connection may also interfere with
caller identification, call waiting, the receiving operation of connected telephones.
â– Call Waiting
If a call comes in during FAX sending/reception, as with branch connections the image may be cor-
rupted.
â– DSL (Digital Subscriber Line)
DSL, a high-speed digital transmission method using existing telephone lines, has several types. These
include ADSL (Asymmetric Digital Subscriber Line) with differing upstream and downstream transmis-
sion speeds, SDSL (Symmetric Digital Subscriber Line) with symmetrical upstream and downstream
transmission speeds, and VDSL (Very high bit rate Digital Subscriber Line) which features higher
speed. However, because the line is used for both voice and data transmission, various problems may
occur, such as noise during spoken conversation, low sound volume, and mis-dialing. Replacing the
splitter may improve the situation.
â– Noise
If electronic equipment (television, computer, microwave, etc.) or devices equipped with motors are
located near a FAX, noise from them may degrade the line condition.
Also, a telephone line, acting as an antenna, may absorb electric waves generated from wireless or
broadcasting equipment.
Because FAX data is audio data, the line quality affects the quality/stability of image data as well as that
of conversation.
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