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: Q.442
: Q.442 (11/88) |
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| Q.442 : Pulse transmission of backward signals A-3, A-4, A-6 or A-15. Multifrequency signalling equipment
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Recommendation Q.442 (11/88)
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Approved in 1988-11-25
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Status : In force
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Access : Freely available items
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Available languages and formats :
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Format |
Size |
Posted |
Article Number |
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| English |
 PDF (acrobat)
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66073 bytes |
1989-02-10 |
E 11852 |
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| Español |
PDF (acrobat)
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73990 bytes |
1989-02-10 |
S 11852 |
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| Français |
PDF (acrobat)
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73779 bytes |
1989-02-10 |
F 11852 |
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Available languages and formats :
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