| Example:
PSTN Network operator in two towns |
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| Note that by dial-up |
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| networking
part |
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| of local
exchange capacity |
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| is allocated for
another |
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| operator |
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| X.25 |
| A PCM-link |
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| OSS: Operations
Support |
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| System |
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| ATM |
| MUX: multiplexer |