In NOKIA BTS, i guess you can achieve abot 14 TRX per Abis link, max. Approximatively… it depends hat kind of RSL and OML multiplexing you want to use. it also depends on how many cells : one cell with many TRX’s takes less Abis timeslot than several cells with less TRX/cell.
i’m not nokia, so i can’t say the exact value. Why don’t you ask them directly ??