A channel of client services from station A
to station B are interrupted, and the client equipment at station B receives no optical
signals or receives a large number of bit errors.
The U2000 provides the service signal flow interface. For information on how to view the service
signal flow in GUIs, see "Viewing the Signal Flow Diagram for a WDM Trail" in the Online Help.
The Client equipment at station B receives no optical signals or receives a large number
of bit errors. the service signal flow of the Client equipment at
station B is: Client equipment at station A → OTU at station A → MUX at station A →
OA at station A → OA at station B → DEMUX at station B → OTU at station B →
Client equipment at station B. Possible causes are as follows:
– The transmit unit of station A is faulty.
– The optical path (including the fibers and fiber connectors) is faulty.
– The receive unit of station B is faulty.
a. Analyze the alarms and performance of the OTU at station A. If the client-side
interface of this OTU receives no optical signal or its received optical power is too
low, locate the fault to the transmit end of the Client equipment at station A, the
fiber jumper from the client equipment to the OTU, or the client side receiver
module of the OTU.
b. If the input optical power of the OTU at station A is normal, check whether its
output optical power is normal. If not, locate the fault to this OTU.
If the output optical power of the OTU at station A is also normal, observe whether
the optical power of the MUX at station A sharply changes. If there are many
wavelengths at station A, the loss of one of them does not results in a great change
to the optical power. Therefore, feed the signals at the MON port of the MUX to the
MCA board and query for any loss-of-wavelength alarm.
d. The key components on the MUX are passive; therefore, the MUX is not likely to
be damaged. When the MCA detects the loss of a wavelength, the most possible
fault point is between the fiber jumper from the OTU to the MUX.
e. The OA provides a function of input and output optical power detection. If the OA
is faulty, multiple wavelengths are affected. As a result, the possibility is rather low
that the OA board is faulty.
f. At station B, analyze the signal flow in this order: OA at station B → DEMUX at
station B → OTU at station B → Client equipment at station B. The method to
analyze the signal flow at station B is similar to that of station A.
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