DEC WANcontroller 622 PTT Information

This document details the BABT Approved Service Specifications for the DEC WANcontroller 622, outlining its compliance for use in the UK. It specifies the use of an X.21bis interface (CCITT recommended) with V.35 electrical and ISO 2593, BS 6623: part 4, 1986 physical requirements. The controller supports data rates of 48, 56, and 64 Kbits/s, with compatibility varying among UK Public Telecommunications Operators: BT supports 48 and 56 Kbits/s, Kingston Communications (Hull) supports 48 Kbits/s, and Mercury Communications (MCL) supports all three rates. Approved adapter and extension cables (BC19F-02 and BC19L-25) are also listed. The document further provides the module's power rating (5 V at 2.5 A, 12 V at 0.1 A, -12 V at 0.1 A), emphasizing the need to ensure total power drawn remains within the host power supply's limits. Critical notes include a maximum total cable length of 27 feet and the exclusive use of DECNIS approved or compliant cables.