Network interface units and communication system using network i

Details Network interface units and communication system using network i Network interface units and communication system using network i

1991-11-27

1993-11-30

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 855, 370 8513, 370 8514, 370 941, H04J 324

Patent

active

052672387

ABSTRACT:
A network interface unit couples a lattice communication network and at least one token ring network. The network interface unit includes a sequence controller which controls a token detector and a reception register so that message information received from the lattice communication network via a node apparatus connection port is looped back from the token ring network via a terminal connection port and output from the node apparatus connection port when an address detector detects that a destination address matches a stored source address, and absorbed when the address detector detects that the destination address does not match the stored source address. The network interface unit also includes a phantom signal part which outputs a detection signal via the terminal connection port when a phantom signal has been received, the phantom signal part including a set of resistors coupled to the terminal connection port, each of the resistors having a resistance that produces a detection signal having an appropriate level.

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TMS380 Adapter Chipset User's Guide, Jul. 1986, pp. iii, 4-127, 4-128, & A-110, Texas Instruments.

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