Black Box MT720A-35T Manual De Usuario
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CHAPTER 4: Operation
27
Table 4-1. Fradswitch-8A controls, indicators, and connectors (continued)
Item
Control, Indicator, or Connector
Function
4
SYNC Indicator
Indicators, one for each main link, indicate
Fradswitch synchronization status.
Condition
Fradswitch synchronization status.
Condition
Indication
Off
Fradswitch not powered.
On
Fradswitch powered and
synchronized with the corres-
ponding X.25 DTE or DCE
peer.
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.
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.
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.
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.
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.
the data buffers) and initiates the power-up
self-test.
9
Channel Connectors
Connection to Fradswitch channels
(one connector per channel).
(one connector per channel).