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Voice interface card - plug-in module - E&M / 1 analog port(s) - refurbished
By installing specific signaling modules known as analog personality modules (APMs), you can equip the analog voice ports for the signaling types in various combinations. Offered recEive and transMit (E&M) Analog Personality Module allows connection for PBX trunk lines (tie lines). E&M is a signaling technique for two-wire and four-wire telephone and trunk interfaces.
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