Network Hardware User Manual

PRO SWITCHING SYSTEM

• Signals (red): Some Pro Switching System cards include LEDs that indicate the

current status of signals. For example, RS-232 cards with LEDs indicate the

status of TD, RD, RTS, CTS, DSR, DCD, DTR, and RI.

• ALM (red): When flashing, indicates that the line passing through this card is

generating an alarm condition.

• MON (green): When lit, indicates that the line is currently connected to the

monitoring bus. The connection is made for monitoring and testing

operations.

• BK (red): When lit, indicates that the line is currently broken. The break is

made for testing operations.

• TS (red): Not used.

• LP (red): Not used.

Patch Cavities

Switch/patch cards can have up to four patch cavities, which allow you to monitor

and test the lines. Normally, data transmission is normal through. That is, the DTE

is connected to the DCE. However, if you connect a patch cord to a patch cavity,

you can monitor or test the line as follows:

• COMP: When you insert a patch cord into the COMP cavity, the circuit is

broken and the cord is connected to the DTE. You can use this connection to

test the DTE.

• MODEM: When you insert a patch cord into the MODEM cavity, the circuit is

broken and the cord is connected to the DCE. You can use this connection to

test the DCE.

• MON A: When you insert a patch cord into the MON A cavity, it is connected

to the circuit between the DTE A port and the DCE port. The circuit is not

broken. You can use this connection to monitor the signals.

• MON B: When you insert a patch cord into the MON B cavity, it is connected

to the circuit between the DTE B port and the DCE port. The circuit is not

broken. You can use this connection to monitor the signals.