ITU-T E.721-1991
Network Grade of Service Parameters and Target Values for Circuit-Switched Services in the Evolving ISDN (Study Group II; 8 pp)
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ITU-T E.721-1991
Standard No.
ITU-T E.721-1991
Release Date
1991
Published By
ITU-T - International Telecommunication Union/ITU Telcommunication Sector
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