HTC-439 List 2 HiGain Test Card Product Catalog: 150-439-102-02 CLEI: T1DQACBJ…The ADC HiGain Test Card HTC-439 List 2 provides a convenient method of testing Central Office (CO) and Field Tip and Ring transmit and receive pairs from any standard T1-239 repeater slot. The width of the HTC-439 List 2 has been reduced from the List 1 unit so that the List 2 fits a four-slot HRE-504 enclosure without interfering with plugs above or below it….TEST CARD Test points on the HTC-439 ( Figure1 ) provide access to each active card-edge connector pin including Frame Ground. These test points are identified by the pin number to which they connect. The four-position test slider switch (S1) selects which test (Open, Short, Loop Thru, or Loop Back) is to be performed on CO and field circuits….

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