Black Box MT722AE-X21T Manual De Usuario

4

SYNC Indicator

Indicators, one for each main link, indicate 
Fradswitch synchronization status.
Condition

Indication

Off

Fradswitch not powered.

On

Fradswitch powered and
synchronized with the corres-
ponding X.25 DTE or DCE 
peer.

Flashing

Fradswitch powered, but 

(continuous)

not synchronized with the 
corresponding X.25 DTE 
or DCE peer.

5

ERR Indicator

Lights when a hardware malfunction was 
detected during the self-test automatically 
performed upon power-up, or after pressing 
the RESET pushbutton.

6

OVF Indicator

Lights when the Fradswitch’s buffers are full. In 
a properly designed system, this condition usually 
indicates that one of the DTE units connected to 
the Fradswitch does not respond to the flow- 
control commands sent by the Fradswitch, a 
condition that could be caused by incorrect 
configuration of the Fradswitch.

7

TEST Indicator

Lights to indicate that the Fradswitch is in the
diagnostics mode (one of the test loops active) 
or that one of its channels is connected to the 
Fradswitch command facility. In either case, 
traffic is interrupted.

8

RESET pushbutton

Resets Fradswitch internal circuits (including 
the data buffers) and initiates the power-up 
self-test.

9

Channel Connectors

Connection to Fradswitch channels 
(one connector per channel).