��� 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