RAD Industrial Partner

RAD DXC-30 Modular Digital Cross Connect DHS - Dual-Channel High-Speed Data Module Simple Type: Expansion Module

Each DHS module provides DXC with two high-speed data channels. DHS is available with a number of options for the user data ports, including a 10/100BaseT Ethernet bridge with transparent VLAN forwarding, or a choice of sync data interfaces: V.35, X.21, V.24, RS-530, or V.36/RS-449. V.35 and V.11/RS-422 channel interfaces terminate in 25-pin D-type female connectors. Pin assignment is compatible with RS-530 specifications. Special adapter cables can be ordered to connect these channels to standalone V.35 or V.36/RS-449 equipment. X.21 and V.24 channel interfaces terminate in 15-pin D-type female connectors. Each synchronous data channel operates data rates of n × 56 or n × 64 kbps (where n = 1 to 31 for E1 and 1 to 24 for T1 links). Channel data rates, as well as all operating parameters, are soft-selectable. Instead of synchronous data channels, DHS can be equipped with 10/100BaseT Ethernet interfaces for virtual LAN connections over n × 56 kbps, or n × 64 kbps lines (ETUB option). The bridge filters Ethernet/Fast Ethernet frames, forwarding only frames destined to the WAN. The 10/100BaseT module can also block broadcast and multicast messages. The 10/100BaseT Ethernet bridge also features automatic MDIX support, fault propagation of WAN error conditions to the Ethernet port, and two queues for handling priorities. Timeslots used on the E1 or T1 link can be either user-assigned or automatically selected. Selectable timing modes permit each synchronous data channel to be configured as either DCE or DTE, and provide buffered retiming of the received data. Connection to nationally supplied digital lines (such as DDS) is supported. An external clock can be selected as the source for system timing. Self-diagnostics upon power-up, as well as powerful testing capabilities, reduce downtime to a minimum. Local support of four control signals for each channel is provided. The DHS module occupies one I/O slot in DXC-8R, DXC-10A or DXC-30 chassis.

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