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The ATM card has the capability to support all of the signaling protocol stacks in the SGSN and MSC in a 3G network, and a wide variety of protocols can run simultaneously on the card. The Radio Access Network Application Part (RANAP) is the Radio Access layer for the Iu Interface and is found in both the SGSN and MSC. Here, integrating is at the MTP3b and M3UA level via SSCOP, SSCF and SCTP respectively. SSCOP, SSCF runs over AAL5 on the Adax ATM card. The Gateway Tunneling Protocol (GTP) in the SGSN runs with IP over Ethernet and with AAL5 over ATM using Frame Relay software. GTP is supported by the Ga, Gn and Gp interfaces, which interconnect the SGSN to the GGSN and charging gateways.