Cabletron Systems CSX1000, CSX1200 manual Alarm Leds PRI only

USER’S GUIDE

ALARM LEDS (PRI ONLY)

If your CyberSWITCH is not functioning properly, check the L1 LED on the front panel. This LED, which indicates Layer 1 capability, should be lit. If it is not lit, there is a problem with Layer 1; now check to see which Alarm LEDs are lit.

Alarm LEDs (a bank of four LEDs) are located on the lower left back panel of the CyberSWITCH’s PRI chassis. These LEDs provide specific PRI layer 1 information. Each of these indicators represent the status of a PRI alarm.

A PRI alarm indicator will light up when the corresponding event has been steadily active (not transient) for a given amount of time. After this period of time, the event is “qualified” and the alarm is generated.

If one or more of these lights are lit and your system was previously functioning properly but is not now, contact your line provider and tell them which alarms you are seeing. They should be able to give you an indication of where the fault lies.

If one or more of these lights are lit and this is the initial installation of your system (it was not previously functioning properly), check your system’s cabling. If you can find nothing wrong with the cabling, contact your line provider and tell them which alarms you are seeing.

The four alarm indicators are as follows:

•AIS (alarm indication signal) Also known as a blue alarm.

Lights up when layer 1 detects a qualified unframed all ones signal.

AIS may be generated by intermediate device (the equipment between the 1200 and the switch) when the intermediate device sees an improper receive signal (or lack of signal) from the switch. The local device (the CyberSWITCH) will transmit RAI back to the switch when it receives AIS.

4. RAI sent to Switch
1. Original Signal sent
to Switch		2. Bad Signal sent
3. AIS sent from CSU
			Switch
Intermediate		from Switch
	Device
	(CSU)

•RAI (remote alarm indication) Also known as a yellow alarm.

Lights up when layer 1 detects a qualified RAI signal.

The RAI signal indicates that an intermediate device or switch has detected an improper receive signal (or lack of signal) from the local device (the CyberSWITCH).

424 CyberSWITCH