User manual

Chapter 3. Operation
3-8 ATLAS Quad USSI Module User Manual 61200261L1-1
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TEST
Activates specific data ports testing. It also controls the activation of loop-
backs and the initiation of data test patterns. Test results display on the
ATLAS_800 front panel.
» Loopbk
Write security: 4; Read security: 5
Controls the activation and deactivation of loopbacks.
Table 3-1.
Normal Mode Operation
Conditions Causing Port Control Signal Deactivation
Signal
CTS DCD DSR
RTS
Follows
——
V.54 Loopback
Off
—
Off
511 Test On
Off
—
Off
Self-test Active
Off Off Off
Network Test Active
Off
—
Off
No DS0 Mapped
Off Off Off
Network Alarm
Off Off
—
— = Do not care
Executing port tests disrupts normal data flow in the test port.
No Loopback
The loop is deactivated.
Local Loopback
The USSI port activates both a local loopback (back to-
ward the DTE) and a port loopback when invoked.
Remote Loopback
The remote loopback causes a V.54 loopback code to be
sent to the far end. If the device at the far end supports
V.54, the device activates a loopback on detection of the
V.54 code.