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Active standard | Published: 15/03/1996
ETSI ETR 251-ed.1
Public Switched Telephone Network (PSTN); Signalling System R2; Digital line signalling [CEPT Recommendation T/CS 42-03 E (1985)]
Available languages: English
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Detail information
Designation: ETSI ETR 251-ed.1
Publication date: 15/03/1996
Pages: 4
Country: European technical standard
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