LINE & PORT SHARING UNITS

Port Sharing Units connect four or eight terminal devices or communications controllers to a single modem, CSU/DSU or computer port in a polled communication system environment. You can cascade the units to link additional terminals or controllers. Applications range from simple modem or router sharing to true front end processor port sharing

MODEL 1710

Model 1710 is a full featured port and line sharing device, that is able to rephase the receiving clock and data sources to provide extremely reliable tail circuit operations. Easily accessible switches on the front panel allow you to set speeds, program RTS/CTS delay and direct the master clock to any of the five ports. All interfaces are V.35 (M-34 female) connectors and operate at 56 or 64Kbps on internal clock, up to 1.544 Mbps on external clock. Model 1710 allows up to 4 terminal devices on tail circuits (modems or CSU/DSU) to share a single port, modem or CSU/DSU operating in a multi-point, polled, system environment. Cascade the 1710's to provide additional terminal connections.

Model 1720, 1721, 1731

The Model 1720, 1721, and 1731 Line Sharing Units provide immediate system expansion without the need to acquire additional computer ports, modems or data lines. These units allow four or eight polled synchronous or asynchronous devices to use one modem or CSU/DSU. When an address poll is received, the Line Sharing Unit will broadcast to all terminals or controllers. The first terminal or controller to raise RTS (Request to Send) in answer to a poll will be selected and all others will be denied access until RTS is lowered. Model 1720 interfaces with V.35 (M-34 female) connectors and both Model 1721 and Model 1731 interface with RS-232 (DB25) connectors.