TheAnnex T1 Internal CSU Status window displays information in the
T1 Alarms, T1 Status andInterval Information boxes. In addition, it includes the
Interval(s) field. You can enter information in this field. Like all RAC status commands, you cannot change a RAC configuration from this window.
Alarms Box
The T1 Alarms box provides both historical and current information about T1 alarms. This box includes the following fields:
• Blue History indicates whether a Blue alarm occurred since the T1 Engine has been on-line. This field displaysTrue if an alarm occurred orFalse if an alarm did not occur.
• Blue reports the current status of the Blue alarm.This field displaysOnif the T1 engine is receiving AIS (all ones, unframed) from the network, orOff if the T1 engine is not receiving AIS.
• Red History indicates whether a Red alarm occurred since the T1 Engine has been on-line. This field displaysTrue if an alarm occurred orFalse if an alarm did not occur.
• Red reports the current status of the Red alarm. This field displaysOnif the T1 engine is detecting loss of frame
synchronization and is sending a Yellow alarm to the network.
The field displaysOff if the T1 engine is in frame synchronization.
• Yellow History indicates whether a Yellow alarm occurred since the T1 Engine has been on-line. This field displaysTrue if an alarm occurred orFalse if an alarm did not occur.
• Yellow indicates the current status of the Yellow alarm. This field displaysOn if the T1 engine is receiving a Yellow alarm from the network orOff if the T1 engine is not receiving a Yellow alarm.
T1 Status Box
TheT1 Statusbox displays statistics for the T1 network interface. This box includes the following categories:
• Engine Bypassindicates whether the engine is connected to the network interface. This field displaysenabled if the T1 engine is connected to the network interface ordisabledif the T1 engine is connected to the Drop/Insert Interface.
• Sync indicates whether the T1 engine is detecting frame synchronization. This field displaysTrue if the T1 engine is detecting frame synchronization orFalseif the T1 engine lost frame synchronization and entered the Red alarm state.
• DII Sync indicates whether the Drop/Insert Interface is receiving ones pulses and is in frame synchronization. This field displays True if the Drop/Insert Interface is receiving ones pulses and is in frame synchronization orFalse if the Drop/Insert Interface is out of frame synchronization or not receiving pulses and is sending AIS (all ones unframed).
• Signal Loss indicates whether the T1 engine is detecting pulses on the T1 network interface receivers. This field displaysTrue if the engine is not detecting pulses. If the engine is not detecting pulses, the T1 engine transmits AIS (all ones, unframed) on the T1 network interface. The field displaysFalse if the T1 network interface is receiving pulses.
• Loopback Mode indicates loopback status. This field can display:
– noloop to show that the signal is not looped through the T1 engine.
– localloop to show that the outgoing signal of the T1 engine is looped back to the incoming side.
– lineloop to show that the incoming signal is looped to the network without passing through the T1 engine.
– payloadloop to show that the incoming signal is looped through the T1 engine after it passes through the framing function.
• Uptime indicates the amount of time (in hours, minutes, and seconds) that the T1 engine has been up. The hours field can count up to 2,700 days.
• Unit ID identifies the T1 engine, using its firmware number, firmware revision number, firmware release date, and EPROM check sum.
• Serial Number displays the number of the engine.
• Circuit ID displays the circuit identification number of the engine.
Interval Information Box
TheInterval Information box provides T1 engine statistics in the following categories:
• Interval Number lists each 15-minute interval for which statistics appear in this box. This column displays a number from 1 to 96, Current, orTotal.
• Out of Frame Errors lists the number of Out of Frame (OOF) events that occurred. An OOF event begins when the network interface sends two of four incorrect consecutive frame synchronizing bits, and ends when reframe occurs.
• BiPolar Violations lists the number of BiPolar Violation (BPV) errors. For AMI-coded signals, a BPV event occurs when there are two consecutive pulses of the same polarity. For B8ZS-coded signals, a BPV event occurs when there are two consecutive pulses of the same polarity that are not part of the zero substitution code.
• CRC Errors lists the number of CRC errors. A CRC error occurs when the CRC field calculated by the installation, based on the incoming DS1 signal, does not agree with the CRC field contained in the DS1 signal received from the network.
• Controlled Slip lists the number of times the T1 engine replicates or deletes a DS1 frame.
• Rec. Net. Alarms (Receive Network Alarms Seconds) lists the number of seconds with alarm events.
• Error Seconds list the number of seconds with one or more CRC or OOF errors.
• Sev. Err. Seconds (Severe Error Seconds) lists the number of seconds with 320 or more CRC or OOF errors.
• Unavailable Seconds lists the number of one-second intervals during which service was unavailable.
• Cntrl. Slip Seconds (Controlled Slip Seconds) lists the number of seconds with one or more controlled slips.
• Bursty Err. Seconds (Bursty Error Seconds) lists the number of seconds with more than one, but less than 320 CRC errors.