23A - Single pair disconnection of jumper wires from permanent wires. Provides temporary disconnection of lines for maintenance or pre going live
24A - Single pair marking or priority circuits. Prevents disconnection of priority circuits and use of test/patch plugs. Cannot be removed without use of a tool
25A - Disconnection of all 10prs on a module. Provides temporary disconnection of lines for maintenance or pre going live. Can be daisy chained for multiple cut-over