Signalling

Some articles on signalling:

London Underground Infrastructure - Planned Improvements - Line Upgrades
... to improve capacity and reliability, with new computerised signalling, automatic train operation (ATO), track replacement and station refurbishment, and, where needed, new rolling stock ... During 2007, work began to install moving block signalling and ATO on the Jubilee line ... in testing the new software while still running trains under the old signalling ...
SS6
... SS6 or CCITT No 6 Signalling System was introduced in the 1970s as an early common channel signalling method for telephone trunks between International Switching Centres (ISCs) ... applications since at that time C4 and C5 signalling systems were still flourishing but there was a need to experience common channel working on a fast digital basis ... were not suited to Line or Inter-Register signalling and taking the signalling function away from the traffic channel was a better prospect (leads to Common Channel Signalling) ...
Compelled Signalling
... The term compelled signalling refers to a class of telecommunications signalling protocols where receipt of each discrete signal needs to be explicitly acknowledged ... For example, in R2 register signalling, the transmission of each signal involves the following five events The outgoing trunk begins sending the tones that correspond to the signal it wishes to convey in the ... The term is only relevant in the case of signalling systems that use discrete signals (e.g ...
Signalman (rail) - Duties Today
... The principles of British-style railway signalling have changed little since the Victorian era and early 20th century ... these are gradually being replaced by modern power signalling systems on most railways ... The heartlands of British-style railway signalling could be said to be the United Kingdom, New South Wales, Victoria, Queensland, India and South Africa ...
Slovenian Railway Museum - Signalling and Safety Equipment
... Signalling apparatus and all the safety equipment associated with it allows rail travel to be speedy and safe ... Around 1900, electromechanical signalling and safety equipment was introduced ...