ITU-T Q.33-1989
Protection Against the Effects of Faulty Transmission on Groups of Circuits - General Recommendations on Telephone Switching and Signalling - Functions and Information Flows for Services in the ISDN - Supplements (Study Group XI) 17 pp

Standard No.

ITU-T Q.33-1989

Release Date

1989

Published By

International Telecommunication Union (ITU)

Status

Withdraw

Latest

ITU-T Q.33-1989

Scope

Although certain signalling systems may have the capability to provide an indication when an individual circuit is faulty, in order to maintain the required availability of the public network, it is considered necessary to provide alarm facilities to aler

ITU-T Q.33-1989 history

• 1989 ITU-T Q.33-1989 Protection Against the Effects of Faulty Transmission on Groups of Circuits - General Recommendations on Telephone Switching and Signalling - Functions and Information Flows for Services in the ISDN - Supplements (Study Group XI) 17 pp