ACS-160 Series & STL-160 Series T1 Mux Installation & Operation 6-Testing & Troubleshooting
Version 2.11, August 2011
6-20 Harris Corporation
Intraplex Products
• E9 to E12: +5.3 VDC (±0.1 VDC)
• E10 to E12: +15.5% VDC (±1.25 VDC)
• E11 to E12: -15.5% VDC (±1.25 VDC)
4. If the voltages are correct but the indicator lights on the power supply are not on, the fault
probably lies either with the internal connection to the motherboard, or with the blocking diode
that allows two power supplies to work together.
Figure 6-12. Y-Series Power Supplies, Front View
6.6.5 Alert and Alarm Troubleshooting
If an alert or alarm condition is present, the multiplexer takes these measures as appropriate:
● Turns off the NORMAL indicator light
● Turns on the ALERT or ALARM indicator light
● Activates the alert or alarm relays
On an ACS-166 dual terminal multiplexer, the multiplexer registers an alert or alarm if either of the
terminals has an alert or alarm condition, even if the other terminal is operating normally. An alert or
alarm condition on one terminal does not affect the operation of the other terminal.
6.6.5.1 Alert Conditions
One or more of these conditions cause an alert:
● Yellow alarm (RX IN indicator light blinks and RxYl appears in the BLNK group)
● AIS alarm (AIS indicator light on)
● Any internal loopback active (LPBK indicator light on)
● Loss of primary timing (fallback timing is activated, and the timing indicator light corresponding to
the currently selected primary timing mode is blinking)
● Single power supply failure (POWER FAIL indicator light is on)
● Alarm cut-off (ACO) switch on
● Alert at one or more channel modules (module’s alert indicator light is on or module is in alert
state)
6.6.5.2 Alarm Conditions
One or more of these conditions cause an alarm:
● Failed CPU (CPU indicator light on)
● Loss of receive signal
● Signal present but out-of-frame (RX IN and FRM indicator lights on)
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