Telect MIX 56 4-43, Loss of Signal LOS. The absence of any detectable transmission pulses

MIX 56 User Manual 4 Software Operation

For example: to set an alarm to trigger when the High Speed circuit experi- ences more than 3 seconds of Loss of Signal (LOS), set the Alarm On threshold to 003. Then set the Alarm Off threshold to the amount of time the condition must be absent before the alarm clears (ex. 010 = 10 seconds of no LOS).

You can set thresholds for the following alarm conditions for both the high- speed and the low-speed signals:

Alarm Indication Signal (AIS). AIS indicates more serious impairments, such as upstream failures. The system is receiving AIS, a signal sent to in- dicate a transmission interruption located either at or downstream from the equipment sending the AIS. DS3 AIS is a framed signal containing alter- nating ones and zeros, whereas DS1 AIS is an unframed all-ones signal.

Loss of Signal (LOS). The absence of any detectable transmission pulses.

Errored Seconds-15 minutes. The number of errored seconds (ES) in a

15-minute span. An errored second is a second in which Loss of Signal or at least one Coding Violation (CV) occurs.

Errored Seconds-24 hours. The number of ES in a 24-hour span.

Severely Errored Seconds-15 minutes. The number of severely errored seconds (SES) in a 15-minute span. A severely errored second is a second in which 320 or more CV occur.

Severely Errored Seconds-24 hours. The number of SES in a 24-hour span.

Additionally, you can set thresholds for the following alarm conditions for the High Speed signal only:

Remote Alarm Indication (RAI). The system is receiving RAI, a signal sent to indicate the far-end equipment is not receiving a DS3 signal from the MIX 56.

Out of Frame (OOF). The signal does not meet the framing requirements of the Framing Mode (C-bit or M13) specified in the High Speed Configu- ration screen.

The Alarm Thresholds screen also displays the status of the system’s re- dundancy switching capabilities. Locked means the system has automati- cally switched due to some error and the system is locked from automati- cally switching again. The system is locked for 10 minutes after any automatic switch or for 12 hours after the third automatic switch within a one hour time frame. You can enable switching again by tabbing to the [Clear Lock] button and pressing Enter.

122188-10 A0 Telect, Inc. 4-43