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5-10 \ Zhone Technologies
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LED indicators Diagnostics
5.5.2 Ethernet LED
A single green LED indicates the operational status of the Ethernet port. If the LED is
blinking, the Ethernet port is connected and transmitting traffic.
5.5.3 WAN LEDs
The WAN LEDs indicate the transmission status of the two T1 interface ports and their
loopback status. Both T1 indicators are implemented by two tri-color (green/red/yellow)
LEDs. Table 5-2 describes the WAN LEDs.
5.5.4 Power LED
A single green LED indicates the operational status of the power supply to the unit. If the LED
is ON, the power is connected.
Table 5-2. WAN LEDs
LED Description
GREEN (ON) Normal operation, no alarm.
RED (ON) Major alarm. No signal or loss of frame. Loss of signal indicates the
Rx signal at the T1 port is below a sufficient level. Loss of frame
indicates the line cannot recover framing from the Rx signal.
RED (BLINKING) Returning to normal state after a major alarm.
YELLOW (BLINKING) Minor alarm. Excessive error rate. This indicates the T1 framer is
able to recover framing from the Rx signal, but the measured bit error
rate is greater than or equal to allowable limits.
YELLOW (ON) Minor alarm. Loss of signal or loss of frame on remote side.
GREEN (BLINKING) WAN test in progress.