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S |
Old Code |
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AA |
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| Circuit switching |
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| A process that, on demand, connects two or more data terminal equipments and permits the exclusive use of a data circuit between them until the connection is released (ISO). |
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EI |
= |
| EDI transmission |
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| Number identifying the service and service user. |
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MA |
= |
| Mail |
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| Postal service document delivery. |
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TE |
= |
| Telephone |
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| Voice/data transmission by telephone. |
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