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Please specify your question about 4WTO CHANNEL UNIT clei The 4WTO Channel Unit provides an interface of 600 ohms to the 3600 and 4-wire Transmission only (TO) circuits. Tx TLP levels +13 to -17dB and Rx TLP levels of +8 to -16dB. Attenuation range is 0.1dB steps. Requires 3600 equipped wi *