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USER’S GUIDE
424 CyberSWITCH
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.
• 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).
3. AIS sent from CSU
Intermediate
Device
(
CSU
)
Switch
4. RAI sent to Switch
1. Original Signal sent
to Switch
2. Bad Signal sent
from Switch
POWER
SERVICE
TX
RX
10BASE - T
LAN B-CHANNELS E1 ONLY
B2 B4
B6 B8
B26 B28
B22 B24
B18 B20
B14 B16
B10 B12
B30 L1
B1 B3
B5 B7
B25 B27
B21 B23
B17 B19
B13 B15
B9 B11
B29 B31
E1
D
T1
D