RAD Industrial Partner

RAD DXC-30 Modular Digital Cross Connect D8U - 8 Port ISDN "U" Interface Module Simple Type: Expansion Module

D8U is an 8-port ISDN “U” interface module for use with the modular DXC Digital Cross-Connect units. D8U provides ISDN “U” ports, each supporting 2B + D channels, for a total payload data rate of up to 128 kbps per port. 2B1Q line coding is used for full-duplex data transmission over 2-wire unconditioned lines at ranges of up to 5.5 km (3.4 miles) over 26 AWG line. D8U can be configured to work in the following applications: Extension of ISDN lines over non-ISDN facilities (“I” mode). In this application D8U can be configured as either line termination (LT) or network termination (NT) unit, connecting up to two remote locations. Line termination (“1” mode) over leased lines, with D channels disabled. In this application D8U serves as dedicated line termination unit for the ASMi-31 short-range modems, connecting up to 8 remote locations. D8U is fully interoperable with Megaplex-2100/2104 HS-U family modules. Each B channel or “U” interface can be programmed independently to operate at the following data rates (depending on the application): “I” mode: 64 kbps. “1” mode: 64 or 128 kbps. D8U provides 96 VDC phantom feeding to remote equipment. Received from an external power source, the phantom feeding can be enabled or disabled for each module port. Diagnostic functions include loopbacks on external ports and individual channels. Additionally, when operating in “1” mode, the modules can activate remote loopback and BERT on the ASMi-31 modems via the module ports. Setup, control, and diagnostics are performed via a DXC system supervisory port using an ASCII terminal, Telnet, or by the RADview element management system.

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