Special B-ISDN has different network characteristics and requirements with the general B-ISDN, so the ATM signaling of the general B-ISDN is not suitable for the special B-ISDN.

• 由于专用和通用的B-ISDN存在着不同的网络特性和需求,通用B-ISDN中的ATM信令协议并不能满足专用B-ISDN的特点和需求。