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Workgroup Remote Access Switch 425
LED I
NDICATORS
Alarm LEDs (PRI Only)
• LOF (loss of frame)
Also known as a red alarm.
Lights up when layer 1 has detected a qualified loss of frame condition (excluding AIS).
A loss of frame condition occurs when signals are still being received by the switch, but the
1200 can not detect the frames in the receive path.
If you have just installed your CyberSWITCH and you are seeing LOF, there may be a
mismatch between the configured framing mode (for example, SF or ESF) and the framing
mode of the incoming data.
• LOS (loss of signal)
Also known as a red alarm.
Lights up when layer 1 has detected a loss of signal.
LOS occurs when the CyberSWITCH sees no incoming signal at all.
2. RAI sent from CSU
Intermediate
Device
(
CSU
)
1. Bad Signal sent to CSU
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
2. No signal sent back from CSU
LOS detected
Intermediate
Device
(
CSU
)
1. Signal sent to CSU
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