Huawei HG8247 Router Manual PDF (Setup & Configuration Guide)

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l

If

Config State

is

failed

, it indicates that the ONT configuration recovery fails. A possible

cause of this failure is that the ONT is bound to an incorrect ONT profile. To resolve this

problem, run relevant commands to issue a correct ONT profile, or reset the ONT.

l

If

Match State

is

match

, it indicates that the configured capacity set of the ONT is the same

as the actual ONT capabilities. If

Match State

is

mismatch

, it indicates that the configured

capacity set of the ONT is different from the actual ONT capabilities, which will cause

registration failure. In this case, add a new ONT service profile.

Step 4

Check the statistics of the ONT.

l

In the GIU mode, run the

display port statistics

command to query the traffic statistics of

the upstream port of the ONT. Specifically, check whether receive and transmit traffic exists.

l

In the GPON mode, run the

display statistics ont

command to query the performance

statistics of the ONT PON port.

l

In the GPON mode, run the

display statistics ont-eth

command to query the performance

statistics of the ONT ETH ports.

Step 5

Check the data configuration of the ONT.

l

Run the

display dba-profile

command to check the DBA profile bound to the ONT.

l

Run the

display service-port

command to check whether the traffic stream configuration is

correct.

l

Run the

display vlan

command to check whether the upstream port of the ONT is added to

a VLAN.

Step 6

Check the status of the upper-layer device. Specifically, check whether the OLT is in the normal

state.

----End

4.3 Tools Used for Troubleshooting

This topic describes the tools required for troubleshooting: digital multimeter and optical power

meter.

4.3.1 Digital Multimeter

This topic describes the functions and usage instructions of the digital multimeter.

The digital multimeter is a simple and practical test meter frequently used in the electrotechnical

and electronic industries. It is inexpensive, convenient to carry and easy to use, and has a

complete set of functions.

Basically, the digital multimeter is used to measure the resistance, DC voltage, AC voltage,

current and capacitance, and test diodes and triodes.

To use the digital multimeter, do as follows:

1.

Turn on the power supply. (If a digital multimeter without a dedicated power switch is used,

skip this step.)

2.

Select the items to be tested.

3.

Choose a proper measurement range.

4.

Perform the measurement correctly.

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5.

(Optional) Press the button for keeping the current measurement value unchanged.

6.

Read the measurement value.

4.3.2 Optical Power Meter

This topic describes the appearance, functions, and usage instructions of the optical power meter.

The optical power meter is a necessary test meter for testing an optical fiber communication

system. It is mainly used to measure the optical power of various wavelengths at multiple

measurement points of an optical link. Optical power indicates the energy of the light at a

measurement point of an optical link and is an important index of the optical fiber network.

When the optical power is smaller than a specified value, the optical receive end will fail to

detect optical signals. In other words, the optical receive end cannot receive the signals sent from

the transmit end. Hence, it is important to use the optical power meter correctly.

The following considers EXFO's PPM-350B optical power meter as an example to describe how

to use an optical power meter. (Other dedicated optical power meters for PON are used in a

similar way.)

The PPM-350B optical power meter can measure the optical power of various wavelengths,

including 1310 nm, 1490 nm, and 1550 nm in the GPON network.

Figure 4-2

shows the

appearance of the PPM-350B optical power meter.

Figure 4-2

Appearance of the PPM-350B optical power meter

As shown in

Figure 4-2

, the PPM-350B optical power meter is different from common optical

power meters. Specifically, the PPM-350B has a downstream input optical port and an upstream

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input optical port and can display the optical power of three wavelengths: 1310 nm, 1490 nm,

and 1550 nm.

Figure 4-3

shows the common measurement points.

Figure 4-3

Measurement points of the optical power in the GPON network

Maintenance engineers should also know related optical specifications on the ONT side, such

as the maximum output optical power of the 1310 nm wavelength, minimum input optical power

of the 1490 nm wavelength, and receiver sensitivity of the 1490 nm or 1550 nm wavelength.

Table 4-3

lists the optical specifications on the ONT side.

Table 4-3

Optical specifications of optical ports on GPON ONTs

Parameter

Type

Wavelength

(nm)

Unit

Min.

Max.

Upstream data

1310

dBm

+0.5

+5

Downstream

data

1490

dBm

-28

-8

Downstream

CATV

1550

dBm

-8

+2

To use an optical power meter, do as follows:

1.

Connect optical fibers to optical ports correctly in upstream and downstream directions.

2.

Turn on the power supply.

3.

Choose the measurement unit (dB or dBm).

4.

Perform the measurement.

Figure 4-4

shows the measurement interface of the optical power meter.

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Figure 4-4

Measurement interface of the optical power meter

Optical channel loss is the total insertion loss caused by optical fibers, optical splitters, optical

fiber connectors, and fiber connection points.

Table 4-4

shows the estimation of optical channel

loss in the engineering design.

Table 4-4

Optical loss parameters in engineering

Item

Average Loss (dB)

Connection

point

Connector

0.3

Mechanical

splicing

0.2

Fusion splicing

0.1

Optical splitter

1:64

19.7

1:32

16.5

1:16

13.5

1:8

10.5

1:4

7.2

1:2

3.2

Optical fiber (G.

652)

1310 nm (1 km)

0.35

1490 nm (1 km)

0.25

Optical channel loss = L x a + n1 x b + n2 x c + n3 x d + e + f (dB)

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NOTE

l

a indicates the average loss of an optical fiber per kilometer (unit: dB/km). L indicates the total length

of the optical fiber (unit: km). The loss of patch cords and pigtail fibers used in engineering can be

ignored because they are usually very short.

l

b indicates the loss of a fusion splicing point (unit: dB) and n1 indicates the number of fusion splicing

points.

l

c indicates the loss of a mechanical splicing point (unit: dB) and n2 indicates the number of mechanical

splicing points.

l

d indicates the loss of a connector (unit: dB) and n3 indicates the number of connectors.

l

e indicates the loss of an optical splitter (unit: dB). Only 1-level optical splitting is considered here. In

the case of 2-level optical splitting, the loss of two optical splitters must be considered.

l

f indicates the engineering margin. Generally, the value is 3 dB.

4.4 Remote Maintenance and Troubleshooting on the Web

Page

This topic describes how to remotely maintain and troubleshoot the ONT on the Web page.

4.4.1 Remotely Logging in to the Web Page

By remotely logging in to the Web page, maintenance engineers can perform maintenance and

troubleshooting without any site visit.

Prerequisite

l

The OLT and the NMS communicate with each other properly.

l

The NMS is able to discover an online ONT and Layer 2 service channels between the OLT

and the ONT are enabled.

Impact on the System

CAUTION

Exercise caution when remotely logging in to the Web page because it deteriorates ONT security.

Procedure

Step 1

In the

Physical Map

navigation tree on the

Main Topology

tab page, double-click the target

OLT, or select the target OLT, right-click, and choose

NE Explorer

.

Step 2

In the navigation tree, choose

GPON

>

GPON Management

.

Step 3

On the

GPON ONU

tab page, set the search criteria to find the GPON ONU records.

Step 4

Select a required record from the ONT list, right-click, and choose

Configure Value-Added

Service

from the shortcut menu.

Step 5

Configure static WAN parameters.

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