| Basic
modules of a modem |
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| n | Diagnostic unit |
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| n | Checks faults
and controls the modem |
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| n | Interface and
line units |
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| n | Adapt the modem
and terminal |
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| n | Modem performs
A/D and D/A conversion and select rate |
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| such that
transmission quality criteria (error rate) can be |
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| meet |
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| Demod. |
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| Interface |
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| and |
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| check |
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| Mod. |
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| Line |
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| unit |
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| Line |
| Diagnostics |
