6
FALLBACK SWITCH AND LOOPBACK SWITCH
2. Description
2.1 Introduction
The Fallback Switch is a standalone remotely controllable A/B switch for EIA
RS-232/V.24, V.35, or RS-530/422 circuits. You can switch via console command,
manual pushbutton, or automatically upon alarm. The Loopback Switch (SW112A
or SW112AE) is identical to the RS-232 Fallback Switch (SW111A or SW111AE)
except that the “B” switch connector has been replaced by an internal loopback
plug.
Both Switches include control-interface firmware that functions as the logical
bridge between a management console (any ASCII terminal) and the Fallback or
Loopback Switch module. The console connects to the Switch via 4-wire modular
cabling.
2.2 Switch Capability Summary
From the console, you can:
1. Determine A/B switch status of any interface.
2. Define alarms per interface.
3. Switch the circuit (Fallback Switch) or invoke loopback (Loopback Switch).
4. Configure autoswitch on alarm.
5. Disable front-panel control.
6. Establish or change the password (optional).
7. Access the HELP screen for all functions.
8. Access or set time and date.
You can also control address selection and A/B switching pushbutton control
manually at each Switch.
