No products
ITU-T G.941 Digital line systems provided by FDM transmission bearers
ITU-T R.35 Standardization of FMVFT systems for a modulation rate of 50 bauds
ITU-T S.32 Answer-back units for 200- and 300-baud start-stop machines in accordance with Recommendation S.30
ITU-T Q.442 Interregister signalling; Pulse transmission of backward signals A-3, A-4, A-6 or A-15
ITU-T E.231 Charging in automatic service for calls terminating on special services for suspended, cancelled or transferred subscribers