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並前往https://www.looptelecom.com/tw/product_cards/Quad-EMA-Voice-Card-for-AM3440-DE-V4200-9

Quad E&MA Voice Card for AM3440-D/E / V4200-9 - Loop ...

The QEMA card requires an external cable to support 4-RJ45 ports for ... There are 3 diagnostic functions supported: off hook test, loopback test, ...

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