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GPON is a point-to-multipoint (P2MP) passive optical access standard
that complies with ITU-T G.984.x. A GPON system consists of an optical
network terminal (OLT) interconnected to optical network units (ONUs)
with an optical distribution network (ODN).
R/SS/R ODN UNISNI
The GPON access feature brings the following benefits to carriers:
Longer transmission distance:
The application of optical fibers can support a transmission radius of 40
km at the access layer, resolving transmission distance and bandwidth
issues in twisted pair transmission.
Each GPON port can support a maximum transmission rate of 2.5 Gbit/s
in the downstream direction and 1.25 Gbit/s in the upstream direction,
meeting the usage requirements of high-bandwidth services, such as
high definition television (HDTV) and outside broadcast (OB).
The GPON access feature can be applied in fiber to the building (FTTB),
fiber to the curb (FTTC), fiber to the home (FTTH), fiber to the mobile
base station (FTTM), fiber to the office (FTTO), and fiber to the Wi-Fi
(FTTW) scenarios and support services including voice, data, video,
private line access, and base station access.
Better user experience on full services:
Flexible QoS measures support traffic control based on users and user
services, implementing differentiated service provisioning for different
Higher resource usage with lower costs:
GPON supports a split ratio up to 1:128. A feeder fiber from the CO
equipment room can be split to up to 128 drop fibers. This economizes
on fiber resources and O&M costs.
Type B and Type C Switching
Type B switching
Improved switching performance:
Switching is performed by hardware,
which shortens the switching
duration to 50 ms.
Cost effective: Type B switching
protects feeder fibers. When
compared with type C switching,
type B switching can provide the
same switching rate at a lower cost.
E2E protection: Type C switching
can protect the entire GPON
network between the OLT and
ONUs, featuring high reliability. In
single-homing scenarios, the
switching duration is shortened to
tolerance: An ONU is dual-homed
to two OLTs, further improving
Chip-level line protection switching ensures high system reliability.
PON 1 PON 2
Type C switching
Unique Upgrade Without Interrupting Services
The entire upgrade process does not interrupt services.
Step 1: Upgrade control boards. Upgrade the standby
control board, perform active/standby switching, and
then upgrade the original active control board. In this
way, the upgrade of control boards does not interrupt
Step 2: Upgrade GPON boards. An MTU or CBU with type B/C switching
enabled connects to two GPON boards. Upgrade the standby GPON
board, perform type B/C switching, and then upgrade the original active
GPON board. In this way, the upgrade of GPON boards does not interrupt
High Precision Clock and Time Synchronization
Clock signal input
Supports 1588 adaptive clock recovery (ACR) and 1588v2
clock signal input to implement the 50 pps clock frequency
and 100 ns time synchronization precision, meeting usage
requirements of various base stations. (1588 ACR does
not support time synchronization.)
High clock and time synchronization precision meets clock
precision requirements for the mobile backhaul service in
various network systems.
Clock signal transfer: PON lines
Time signal transfer: PON
Four HQoS Levels Supporting Intelligent Bandwidth Scheduling
User level ONT level PON level
①Queue group shaping: Multiple
services of the same type are
bound for scheduling, improving
②User-based scheduling: User
levels can be configured,
preferentially ensuring the
bandwidth of high value users.
③Up to eight queues: Richer queue
resources support more services.
④Priority-based scheduling: All the
four HQoS levels preferentially
ensure high value services.
⑤Bandwidth-based scheduling: All
the four HQoS levels ensure
Typical usage scenario of enhanced four HQoS levels
OMCI Extension for Higher Upgrade Efficiency and
Shorter Interruption Time
ONT upgrade efficiency improved by one time: The time required
for upgrading 1000 ONTs connected to one OLT is shortened from 40
minutes to 20 minutes.
Service interruption time shortened by one time: The service
interruption time of 3500 ONTs connected to one OLT is shortened
from 200s to 100s.
Original: low ONT upgrade
New: ONT upgrade efficiency is
improved by one time
Upgrade program or
Only 32-byte of data can be
transmitted each time. The packets
longer than 32 bytes require
A maximum of 1996-byte of data can
be transmitted each time, which
reduces fragments and improves
Longer Transmission Distance: Simplifying ODN Network
Deployment and Improving Deployment Efficiency
A common GPON board supports
only a 20 km differential fiber
distance. If the transmission
distance is longer than 20 km,
different PON ports are required
to support transmission ranges
from 0 20 km and 20 40 km.
This not only complicates network
planning but also causes a waste
PON 1PON 2
The enhanced new-generation chip
supports the 40 km differential fiber
distance and all PON ports support
the transmission range up to 40 km.
This not only complies with ITU-T
G.984.7 but also simplifies ODN
network planning and service