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Automatic Fallback A/B Switch with Optional Remote Management Port

The Model 4145 monitors carrier presence (DCD) signal on the primary line, port A. If carrier is lost, the unit automatically switches to port B.

Manufacturer - Electro Standards Laboratories
Model # - 4145
SKU - 303090
Submitted By - Electro Standards Laboratories (Manufacturer)
Country - United States
Category - Computers : Network Switches : Fallback A/B Switch

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Automatic Fallback A/B Switch with Remote Port


Data Connectors :   A, B, Common: DB25/Female
Controls :   (1) Pushbutton to select A or B
Display LED's :   Switch Position, Power Presence
Remote Port :   (1) DB9/F serial RS232 port (Option)
Power :   115VAC/60Hz, UL approved wallmount
Dimensions :   2" H x 7.9" W x 7.25" D
Weight :   2.8 lbs.


The PathWay® Model 4145 Automatic Fallback Network Switch allows a device connected to the COMMON port to connect through to the A port. The M4145 monitors carrier presence (DCD) signal on the primary line, port A. If carrier is lost, the unit automatically switches to port B. The Model 4145 network switch will maintain its connection to port B until carrier presence is again detected on port A. When carrier is detected on port A, the unit will automatically return to the A position.

The user can override automatic fallback operation from the front panel and force the unit to operate as an A/B switch. To override automatic operation, the user simply depresses the front panel pushbutton, holds it for 5 seconds, and then releases. The status LED previously lit steady ON begins to flash, representing manual override operation. Momentarily depressing and releasing the pushbutton then allows the user to change the switch connectivity. To change back to automatic operation, depress and hold the pushbutton for 5 seconds and the switch will automatically connect.

The Model 4145 network switch can be ordered to allow remote monitoring and control of the unit. This option adds a Remote RS-232 serial port allowing an off-site station to monitor and/or manage the switch. The off-site operator can monitor the operation mode, fallback or A/B, the switch position, change the mode or switch position, and lockout the front panel pushbutton operation.

Model 4145 Automatic Fallback A/B Switch Features:

1) Model 4145 AB network switch is ideal for automatic fallback applications based on loss of carrier (DCD).
2) Data, handshake, and clock lines of the RS232 interface are supported.
3) Front panel LEDs display the connectivity status & verify power connection at all mes.
4) Rugged aluminum case provides maximum shielding.
5) Other control configurations and interfaces are available (Fallback based on data activity is the Model 4121).
6) Switching using latch relays maintain connection during power loss.
7) Transparent to data format and protocol.
8) Optional Remote port allows off-site monitoring and switch management.


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