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DSLAM
MODEM Stands for MOdulator DEModulator. It acts both as an input & output (SIGNAL) as it converts incoming analog signals to digital and viceversa. Incoming - while downloading. Outgoing - while uploading.
It amplifies the incoming and outgoing signals. This would be used by someone who lived in an area where cell phone reception was poor.
I think it means that you're in an restricted area where the phone can not pick up signals for incoming and outgoing phone calls.
sperarts
a speaker's 'coil' (and magnet) converts electrical signals to sound
goniometer
no it dont
yes
a transducer that converts sound to electrical signals
it is an DAC (Digital to analogue converter
it amplifies both the incomeing and outgoing signals on CB radios