Not enough ISDN channels are available to make the call.
半速动行的ISDN通道对电话呼叫来说是有效的。
I heard that there's a new choice better than a modem or ISDN.
我听说现在有一个新选择比调制解调器和ISDN都好。
I hear that there's a new choice, better than a modem or ISDN.
我听说现在有一种新选择，比调制解调器和ISDN都好。
One day it is a frame relay switch, the next it is your ISDN router.
这一天是帧中继交换机，这是你们未来的ISDN路由器。
ISDN. I heard that there's a new choice better than a modem or ISDN.
我听说现在有一个新选择比调制解调器和ISDN都好。
At the telephone company end, ISDN lines connect to a digital switch.
在电话局一端，ISDN线连到数字交换机。
ISDN is the only mass - deployed, high-speed data service available today.
ISDN是今天能获得的唯一大量部署的高速数据业务。
ISDN is the only mass - deployed, high-speed data service available today.
ISDN是今天能获得的唯一大量部署的高速数据业务。
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