Some systems comprise of single outlet modules which clip into single gang or two gang faceplates, in this case 60 modules would be required with 30 single faceplates. In the UK these are used to change the BT style telephone plugs to RJ45's so they can be used on the structured cabling system. Inside the PBX master adapters are the components that you find in a normal BT wall socket, these enable analogue telephones to ring. If the telephone system is digital it may not need these components so we could buy secondary adapters instead. Some customers may have both types of phones so you need to check, also, any external lines will need PSTN master adapters, these are like normal PBX masters but with surge arrestors fitted.
Various lengths are available and it depends on the cabinet layout to which lengths are bought.
30 x 3m fly leads - these are the same as patch leads and are used to connect from the wall outlets to the PC's. We don't need any for the telephones as they have their own leads. That about covers it apart from some trunking, cable ties and a method of labelling the system.