Um
The air interface amid the adaptable base (MS) and the BTS. This interface uses LAPDm agreement for signaling, to conduct alarm control, altitude reporting, handover, ability control, authentication, authorization, area amend and so on. Cartage and signaling are beatific in bursts of 0.577 ms at intervals of 4.615 ms, to anatomy abstracts blocks anniversary 20 ms.
Abis
The interface amid the BTS and BSC. Generally agitated by a DS-1, ES-1, or E1 TDM circuit. Uses TDM subchannels for cartage (TCH), LAPD agreement for BTS administration and telecom signaling, and carries synchronization from the BSC to the BTS and MS.
A
The interface amid the BSC and MSC. It is acclimated for accustomed cartage channels and the BSSAP user allotment of the SS7 stack. Although there are usually transcoding units amid BSC and MSC, the signaling advice takes abode amid these two catastrophe credibility and the transcoder assemblage doesn't blow the SS7 information, alone the articulation or CS abstracts are transcoded or amount adapted.
Ater
The interface amid the BSC and transcoder. It is a proprietary interface whose name depends on the bell-ringer (for archetype Ater by Nokia), it carries the A interface advice from the BSC abrogation it untouched.
Gb
Connects the BSS to the SGSN in the GPRS amount network.
The air interface amid the adaptable base (MS) and the BTS. This interface uses LAPDm agreement for signaling, to conduct alarm control, altitude reporting, handover, ability control, authentication, authorization, area amend and so on. Cartage and signaling are beatific in bursts of 0.577 ms at intervals of 4.615 ms, to anatomy abstracts blocks anniversary 20 ms.
Abis
The interface amid the BTS and BSC. Generally agitated by a DS-1, ES-1, or E1 TDM circuit. Uses TDM subchannels for cartage (TCH), LAPD agreement for BTS administration and telecom signaling, and carries synchronization from the BSC to the BTS and MS.
A
The interface amid the BSC and MSC. It is acclimated for accustomed cartage channels and the BSSAP user allotment of the SS7 stack. Although there are usually transcoding units amid BSC and MSC, the signaling advice takes abode amid these two catastrophe credibility and the transcoder assemblage doesn't blow the SS7 information, alone the articulation or CS abstracts are transcoded or amount adapted.
Ater
The interface amid the BSC and transcoder. It is a proprietary interface whose name depends on the bell-ringer (for archetype Ater by Nokia), it carries the A interface advice from the BSC abrogation it untouched.
Gb
Connects the BSS to the SGSN in the GPRS amount network.
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