Rec. No.
Q.140 Definition and function of signals
Q.141 Signal code for line signalling
Q.142 Double seizing with both-way operation
Q.143 Line signal sender
Q.144 Line signal receiver
Q.145 Splitting
arrangements
Q.146 Speed of switching in international exchanges
Q.151 Signal code for register signalling
Q.152 End-of-Pulsing conditions – Register arrangements concerning
ST (end-of-pulsing) signal
Q.153 Multifrequency signal
sender
Q.154 Multifrequency signal receiver
Q.155 Analysis of digital information for routing
Q.156 Release of international registers
Q.157 Switching to the speech position
Q.161 General
arrangements for manual testing
Q.162 Routine testing of equipment (local maintenance)
Q.163 Manual testing
Q.164 Testing equipment for checking equipment and signals
Q.180 Interworking of systems No. 4 and No. 5