This document discusses how to configure the logical distance of GPON devices. It lists compatible modules and OLT/ONT devices, then explains how to use the "port range" command to set the maximum and minimum logical distance for an ONT during ranging. Setting the distances properly avoids impacting other ONT services. The "undo port range" command restores the default ranging compensation distance.

1. How to configure the logical distance of GPON
How to configure the logical distance of GPON devices, below is the
details, and the related products can be:
• The module: GPFD, GPBH, XGBC, GPBD;
• The OLT devices: MA5683T, MA5680T, MA5608T, MA5603T, MA5600T,
MA5606T;
• The ONT devices: HG8010H GPON Terminal, HG8240F GPON Terminal,
HG8245A GPON Terminal, HG8245 GPON Terminal, HG8240 GPON Terminal,
HG8010 GPON Terminal, HG8247 GPON Terminal and so on.
The configuration:
The “port range” command is used to configure the maximum and minimum
logical distance. During ranging for an ONT, the appropriate maximum and
minimum logical distance can avoid long-term impact on normal services of
other ONTs.
After this command is executed, the ONT will be re-authenticated and go
online again.
The “undo port range” command is used to restore the ranging
compensation distance of a GPON port to the default value.
Format
port portid range { max-distance max-distance | min-distance min-distance
}*
undo port portid range
Parameters
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2. Parameter Description Value
portid Indicates the GPON port
ID.
Numeral type.
Range: varies with the
board type.
max-distance max-distanceSets the maximum logical
distance (maximum
distance for short) of the
ONT.
Numeral type. Range:
0-60 km.
• GPON board: 0-60
km.
• XG-PON board: 0-
100 km.
Unit: km.
Default: 20 km.
min-distance min-distance Sets the minimum logical
distance (minimum
distance for short) of the
ONT.
Numeral type. Range:
0-40.
• GPON board: 0-40
km.
• XG-PON board: 0-
60 km.
Unit: km.
Default: 0.
Modes
GPON mode
Level
Operator level
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3. Usage Guidelines
• Run the config command to enter global config mode, and then run the interface
gpon command to enter GPON mode.
• Ranging refers to the OLT calculation of the delay of each ONT based on the
physical distance of the ONT to prevent the conflict of the upstream data from
different ONTs.
o When the ranging starts, the OLT sends a ranging message to the ONT
and starts waiting for the ONT response. When the OLT is waiting for the
ONT response, the services of the other ONTs are unavailable.
Therefore, the period of waiting for the ONT response needs to be
shortest-possible.
 Usage of the minimum distance: After sending a ranging
message, the OLT determines beforehand the start time of waiting
for the ONT response according to the preset minimum distance.
 Usage of the maximum distance: After sending a ranging
message, the OLT determines the end time of waiting for the ONT
response according to the preset maximum distance.
o Ensure the following when configuring the minimum and maximum
distance:
 For GPON boards, maximum distance - minimum distance <= 20
km
 For XG-PON boards, maximum distance - minimum distance <=
40 km
 Actual physical distance between the OLT and ONT ≈ (maximum
distance + minimum distance)/2
More related:
What is GPON
Huawei ONT Classification
Huawei HG8245 GPON Terminal
Huawei OLT Optical Module Specification GPON B+ Vs GPON C+
The Main Differences between HG8245 SC UPC and HG8245 SC APC
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