| CN | CN1 | CN2 | CN3 | CN4 | CN5 |
| CT | CT1 | CT3 | CT4 | CT5 | CT6 |
| GERAN | GERAN1 | GERAN2 | GERAN3 | GERAN4 | GERAN5 |
| RAN | RAN1 | RAN2 | RAN3 | RAN4 | RAN5 |
| SA | SA1 | SA2 | SA3 | SA4 | SA5 |
| T | T1 | T2 | T3 |

TSG GERAN (GSM EDGE Radio Access Network)

Overview:

TSG GSM/EDGE Radio Access Network (TSG GERAN) is responsible for the specification of the Radio Access part of GSM/EDGE. More  specifically: RF layer,  Layer 1, 2 and 3, internal (Abis, Ater) and external (A, Gb) interfaces, Conformance test specifications for all aspects of GERAN base stations and terminals and GERAN specific O&M specifications for the nodes in the GERAN.