为所有小区共用的系统特定控制信息从多个基站使用跨整个系统相同的广播信道同步和同时广播。
System-specific control information common to all cells is synchronously and simultaneously broadcast from multiple base stations using a broadcast channel that is identical across the entire system.
集聚器可以在一端有效地将ISDN信道合并在一起形成一个较宽的带宽，然后再另一端将信息再同步。
The aggregator effectively pulls together ISDN channels at one end to form a higher bandwidth and then re-synchronizes the information at the other end.
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