Q.120-Q.139 : Specifications of signalling system No. 4

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Q.120-Q.139 : Specifications of signalling system No. 4

Recommendation Q.120-Q.139 (11/88)

Approved in 1988-11-25

Status : In force

	Table of Contents
Initially published in Blue Book Fascicle VI.2 (1988). Available now in electronic format only

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2002-11-22

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2002-11-22

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2002-11-22

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406528 bytes

2002-11-22

E 22567

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168409 bytes

2002-11-22

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457728 bytes

2002-11-22

S 22567

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201247 bytes

2002-11-22

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2002-11-22

F 22567

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2002-11-22