Quad 4 wire E&M interface card providing four 4 wire E&M voice channels
Aprisa XE’s built-in multiplexer and cross-connect eliminate external equipment and minimize the over-the-air requirements, with eight customer-configurable interface slots integrating voice and data traffic.
4RF Q4EM is a quad port analogue interface card providing a 4 wire analogue circuit and single E&M signalling. The Q4EM digitizes analogue signals using either 64 kbit/s PCM (G.711-compliant) or 32, 24 or 16 kbit/s ADPCM compression (G.726-compliant), providing phone-quality voice transmission. Channel Associated Signalling (A bit) is used to signal between the interfaces. The Q4EM E&M signalling leads are optically isolated, bi-directional lines which can be externally referenced to meet
any of the EIA-464 connection types I, II,IV or V.