Maintenance4-93170-A2-GB20-10 March 1996AlarmsThe E1 DSU/CSU can be attached, either locally orremotely, to an ASCII terminal or printer to display orprint alarm messages. The Communications (COM) portcan be used as the destination for Alarm Set and AlarmClear messages. This enables an ASCII terminal or printerto monitor the E1 DSU/CSU for alarm conditions. Alarmscan also be displayed on a PC that is using a terminalemulation package.Each alarm message contains a customer identificationto indicate which remote E1 DSU/CSU is reporting analarm. For information about customer identification,refer to the Displaying Unit Identity section in Chapter 3,Operation.Possible alarm messages are as follows:• Continuous Loss Of Signal detected at the xInterface (where x is either Network or DTE).• Alarm Cleared. Loss of Signal condition at the xInterface (where x is either Network or DTE).• Continuous Out Of Frame condition detected atthe x Interface (where x is either Network orDTE).• Alarm Cleared. Out of Frame condition at the xInterface (where x is either Network or DTE).• Alarm Indication Signal received at the xInterface (where x is either Network or DTE).• Alarm Cleared. Alarm Indication Signal at the xInterface (where x is either Network or DTE).• An Excessive Error Rate has been detected atthe Network Interface.• Alarm Cleared. An Excessive Error Rate at theNetwork Interface.• Remote Alarm Indication signal received at thex Interface (where x is either Network or DTE).• Alarm Cleared. Remote Alarm Indication signalat the x Interface (where x is either Network orDTE).• Continuous Out Of Frame condition detected atsynchronous data port n (where n is the portnumber: 1–2 for Model 3172 DSU/CSUs, or1–4 for Model 3174 DSU/CSUs).• Alarm Cleared. Out Of Frame condition atsynchronous data port n (where n is the portnumber: 1–2 for Model 3172 DSU/CSUs, or1–4 for Model 3174 DSU/CSUs).• An Excessive Error Rate has been detected atsynchronous data port n (where n is the portnumber: 1–2 for Model 3172 DSU/CSUs, or1–4 for Model 3174 DSU/CSUs).• Alarm Cleared. An Excessive Error Rate atsynchronous data port n (where n is the portnumber: 1–2 for Model 3172 DSU/CSUs, or1–4 for Model 3174 DSU/CSUs).If two alarm conditions are detected at once, the higherpriority alarm is reported. However, if an even higherpriority alarm is detected before the first alarm is cleared,the later alarm is not reported. (The alarms listed aboveare in priority order with the highest priority listed first.)Alarms remain active until the alarm condition iscleared. Also, an alarm clear message is only sent whenthere are no other alarms active.For information about alarm configuration options,refer to the Alarm Configuration Options section inAppendix C, Configuration Options.For troubleshooting information, refer to theTroubleshooting section on page 4-11.