26
PRO SWITCHING SYSTEM
You can connect the monitoring bus to a line in any of three configurations,
which correspond to the patching functions. You can bridge, break to DTE, or
break to DCE.
When you bridge a line, the equipment is connected to the circuit between the
DTE and the DCE. The circuit is not broken, and you can monitor the signals.
When you break to DTE, the circuit is broken and the equipment is connected
to the DTE. You can test the DTE.
When you break to DCE, the circuit is broken and the equipment is connected
to the DCE. You can test the DCE.
The buses use non-latching relays, which return to their normal settings if the
power fails.
The monitoring buses are available for use with the following interfaces: RS-232,
RS-530, and RJ-11.
Figure 3-4. Monitoring Bus. The line card in slot 2 is configured for breakto DTE.
(All other line cards are normal-through.)