The SCPC contains two cards, the main card and the expansion card. The main card contains the power supply, LAP, and 3 General Purpose Ports. The expansion card provides an additional 4 General Purpose Ports.

The Power Supply is negative or positive ground and connects to 21 to 65 Vdc. The SCPC fits into a 19" rack and is 1 shelf high (1.75").

The processor contained on the main card can be programmed for a number of custom applications. Some of which are described below. New ones can developed as required.

HDLC Packet Protection Switch
The High-Level Data Link Control (HDLC) Packet Protection Switch sends and receives HDLC packets through redundant links. The HDLC is carried on 64kbps synchronous link. One of the three General Purpose Ports is the Common Port. The other two Ports are the Redundant ports. A packet received by the Common Port is simultaneously tagged and then send out both Redundant ports. On the receiving side both redundant links are connected to another HDLC Packet Protection Switch. This switch receives both of the tagged packets and picks one of them to send out its Common port. The packet sent out the Common port must be received error-free. All HDLC packets utilize a two-byte CRC to ensure transmission integrity.

P4 Protocol Conversion
A 706050 has been programmed to bridge 2 polling protocols together. Each of the General Purpose Ports can be programmed to receive and transmit one of two protocols. A packet received by one port is converted to the second protocol and sent out a different port. Simultaneously the same packet is sent out yet another port without conversion. For example, a SCPC with 3 General Purpose Ports can be configured to work modified-TABS protocol on two ports and P4 Protocol on the remaining port. Each port is independently configurable for bitrate and interface, RS-232 or RS-422.

Smart Data Bridge
And-gate bridging is commonly used to combine several polling channels in a polling network. If one of the channels becomes noisy then all channels bridged together with an And-gate bridge will become noisy causing the polling network to stop functioning. Programming the SCPC as a Smart Data Bridge allows the polling network to continue functioning even if one or more channels become noisy. The Smart Data Bridge detects the noisy channel and blocks that channel from the rest of the network.

Synchronous to Asynchronous Converter
The Asynchronous to Synchronous Converter will communicate on a 115.2kbps Asynchronous Line and provide a Synchronous 64kbps Port and an Asynchronous Variable Rate Port. The Variable Rate Async Port can be configured to run from 1.2 to 19.2kbps. The two asynchronous ports can be either RS-232(V.28) or RS-422(V.11). The synchronous port provides RS-422(V.11) clock and data signals. The clocks on the synchronous port can be configured for any direction. The Common Port must be connected to the Common Port of another converter over a 115.2kbps data line.