Relcomm 9110003 AB Fallback Switch

Product Description

The RelComm Automatic Backup Switch (ABS) is three switches in one package. A dedicated line and modem primary) can share a computer’s communication port with a dial-up modem (alternate) in these three distinct methods:
 

• The ABS can be operated as a manual A-B switch.
• In its automatic mode, communication with the primary or alternate modems cannot be interrupted, and access cannot be granted to the other until communications have been completed.
• The ABS can be short jumpered to allow for BREAK in PRIORITY by the alternate modem thereby providing the security of a backup communications channel in the event of a dedicated line failure. In this instance,when the alternate raises CTS,DSR or DCD (Pin 5, 6 or 8) the ABS automatically makes the connection to the alternate modem.When CTS,DSR or DCD is lowered,the ABS releases the connection to return to the primary modem connection.All required leads of the RS-232 interface for asynchronous or synchronous operations are switched (12 leads total).

Specifications