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Please specify your question about E&M 2/4W CHANNEL UNIT-2 The E<(>&<)> M, 2/4W Channel Unit provides an interface of 600 ohms or 900 ohms to the 3600/3645 system and 2 and 4-wire E<(>&<)>M special service circuits. Operates as Type I, II and III signalling and Pulse Link Repeater (PLR). A *