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Wallis Dudhnath

An Erlang is a unit of telecommunications traffic measurement. Lots of articles can be found by searching this community.

GSM has a collection of nodes: BTS, BSC, MSC/VLR, HLR, EIR, AuC, etc.. Look at the 3GPP standards for an overview.

MFC R2 – Multi-Frequency Compelled Signalling is a Register to Register signalling system that is based on Voice Frequency. Generally used over a CU (copper). Note that MFC R2 was the main signalling used with Analog switching nodes.

C7 / ss7 – Digital signalling.