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: E.721 |
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| E.721�:�Network grade of service parameters and target values for circuit-switched services in the evolving ISDN
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| In force components |
Number
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Title |
Status |
E.721 (05/99)
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Network grade of service parameters and target values for circuit-switched services in the evolving ISDN
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In force
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| Superseded and Withdrawn components |
Number
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Title |
Status |
E.721 (11/88)
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Network grade of service parameters in ISDN
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Superseded
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E.721 (08/91)
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Network grade of service parameters and target values for circuit-switched services in the evolving ISDN
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Superseded
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