| http://www.w3.org/ns/prov#value | - Not only is there currently a need for a practical, portable test set that is capable of testing already installed ISDN circuits, but one which can perform `dry loop` line testing, prior to its use for ISDN service; namely, there is a need for an ISDN test device that will permit a circuit to be `prequalified` (as ISDN-capable), before ISDN equipment is purchased and connected to the line to be us
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