SS7 USES out-of-band signaling where signaling messages are carried on a separate physical channel.
SS7则使用带外信令，即在另外的一个物理信道上传送信令消息。
With ISDN service, signaling that must be conveyed between the user station and the local switch is carried on a separate digital channel called the D channel.
与必须表达在用户驻地和本地开关之间的ISDN服务，发信号继续称D渠道的一条分开的数字通道。
With ISDN service, signaling that must be conveyed between the user station and the local switch is carried on a separate digital channel called the D channel.
与必须表达在用户驻地和本地开关之间的ISDN服务，发信号继续称D渠道的一条分开的数字通道。
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