Board Name Average Loss (dB)
1:16 13.5
1:8 10.5
1:4 7.2
1:2 3.2
Optical fiber (G.652) 1310nm (1 km) 0.35
1490nm (1 km) 0.25
Optical channel loss = L x a + n1 x b + n2 x c + n3 x d + e + f (dB)
NOTE
l a indicates the average loss of the optical fiber per kilometer (dB/km). L indicates the total length of
the optical fiber (unit: km). The loss of the optical fiber jumper and fiber patch cord used in the
engineering can be ignored because of short length.
l b indicates the loss of a spliced point (dB) and n1 indicates the number of spliced points.
l c indicates the loss of a mechanical connection point (dB) and n2 indicates the number of mechanical
connection points.
l d indicates the loss of a connector (dB) and n3 indicates the number of connectors.
l e indicates the loss of the optical splitter. Only L1 optical splitting is considered. In the case of L2
optical splitting, the loss of two optical splitters must be considered separately.
5.3 Locating Faults Based On the LEDs on the GPON ONT
This topic describes how to locate a fault according to the status of the LEDs on the HG861.
5.3.1 Power LED Off
This topic describes how to locate a fault when the Power LED is off.
5.3.2 LINK LED Off
This topic describes how to locate a fault when the LINK LED is off.
5.3.3 LINK LED Is On but AUTH LED Is Off
The ONT fails to register with the OLT. Generally, the cause for this fault is that the downstream
input data is incorrectly restored. Therefore, check whether the input optical power is correct.
5.3.4 LINK LED and AUTH LED Blink
This topic describes how to locate a fault when the LINK and AUTH LEDs blink repeatedly.
5.3.5 LAN LED Is Off
This topic describes how to locate a fault when the LAN LED is off.
5.3.6 CATV LED Is Off
This topic describes how to locate a fault when the CATV LED is off.
5.3.1 Power LED Off
This topic describes how to locate a fault when the Power LED is off.
5 Troubleshooting EchoLife HG861 GPON Terminal
5-8 Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Issue 01 (2009-07-30)
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