S-33
(2) Definition of Terms
PWD Password (for transmission) X100 0101
RCP Return to control for partial page 0110 0001
RNR Receive not ready X011 0111
RR Receive ready X111 0110
RTN Retrain negative X011 0010
RTP Retrain positive X011 0011
SEP Selective polling 1000 0101
SUB Sub address X100 0011
TCF Training check Zeros for 1.5s
TSI Transmitting subscriber identification X100 0010
Terms Explanation
DTMF Dial Tone Multi Frequency
ECM Error Correction Mode
PBX Private Branch Exchange
Phase A Call set-up
Phase B Pre-message procedure for identifying and selecting the required
facilities
Phase C Message transmission (including phasing and synchronization where
appropriate)
Phase D Post-message procedure including end-of -message and confirma-
tion and multi-document procedures
Phase E Call release
PSTN Public Switched Telephone Network
Abbreviation Function Signal Format