Public Switched Telephone Network (PSTN); Signalling System R2; Signalling and circuit supervision via the European Communications Satellite (ECS) [CEPT Recommendation T/CS 42-09 E (1985)]
STANDARD published on 15.3.1996
Designation standards: ETSI ETR 254-ed.1
Publication date standards: 15.3.1996
The number of pages: 10
Approximate weight : 30 g (0.07 lbs)
Country: European technical standard
Category: Technical standards ETSI