Source: ZTE Documents
▉ What is POL?
A long time ago,
copper cables (including network cables and twisted pair cables
)
were the main media for network transmission.
The inner core of copper cable is copper, which is more expensive and has a limited transmission distance.
Later
, optical fiber began to rise. As a new communication medium, it is light, flexible, compact, and most importantly, has a large transmission capacity and better transmission distance.
Therefore, operators started the process of replacing copper with fiber in the access network, gradually deploying optical fiber to homes (FTTC → FTTB → FTTH), which greatly improved users' broadband experience.
Optical fiber replacing copper cable is not only a replacement and upgrade of the medium, but also brings about a change in the network architecture. The powerful
PON
(Passive Optical Network)
has
emerged.
POL ↑↑↑
With the support of the excellent DNA of the optical fiber family, PON technology has the advantages of "large bandwidth", "extremely simple architecture", "passive", and "easy to deploy and maintain".
The so-called "passive
"
of PON
refers to the use of ODN
(
Optical Distribution Network
)
network to replace the aggregation switch. In the process from the central computer room to the user, no power supply (source) is required in the middle. Passive replaces active, which can reduce failure rate and maintenance costs.
After PON consolidated its position in
the home user market
, it set its sights on a bigger target -
the campus LAN
, and gave itself a new name -
POL
(Passive Optical Local Access Network)
.
Before the emergence of POL, campus LANs generally used
switches for networking
.
With the development of new technologies such as AR/VR, 4K/8K big video, and Wi-Fi 6 ubiquitous wireless, network traffic has surged, and traditional networks have gradually exposed some problems, such as:
-
The bandwidth is far from enough and network upgrades are difficult.
-
Due to the need for multi-level convergence, floor and building handover machines need to be powered and managed, which increases energy consumption and management difficulty.
-
Due to the large number of devices and the large number of failure points, unified management is impossible.
-
Multiple systems need to build networks independently, which results in high construction costs.
-
Each network terminal is connected to various forms of adapter devices.
-
......
POL adopts a new LAN networking solution based on PON technology. Of course, it also fully inherits the advantages of optical fiber and P2MP architecture. One fiber carries all services. It is ultra-wide, extremely simple, passive, easy to deploy and easy to operate and maintain.
It uses OLT
(Optical Line Terminal)
as the aggregation network element and is deployed in the core computer room. Terminal service access is achieved through ONU
(
Optical Network Unit
)
of different service types
.
POL uses passive optical splitters to replace aggregation switches, eliminating the multi-level active aggregation nodes of traditional campus networks, making the network flatter and more suitable for current cloud services that are mainly based on north-south traffic.
From the perspective of network investment, POL saves the aggregation layer, and also saves the corresponding equipment room, power supply and air conditioning, etc., saving TCO and being more environmentally friendly. The ODN network structure composed of passive optical splitters is clear and suitable for different business structures.
POL all-optical networks can be widely used in parks, campuses, hospitals, government affairs, and various scenarios that require local/local broadband networking.
▉ What is “True Full Light
”
?
A broadband network based on optical fiber that
uses light wave technology to complete
information transmission and exchange is an all-optical network.
Next, I will tell you the story of the duel between the two masters of the "Quanguang School
"
.
Round 1
Network architecture competition
In terms of network architecture,
"Ethernet All-Optical" traditional
three-layer network architecture
,
Multiple layers of convergence are required.
There are obvious shortcomings in supporting cloud-based businesses that are mainly based on north-south traffic.
The aggregation switch requires
a separate local power supply
.
Increase failure rate and maintenance costs,
Long-term increase in energy consumption
,
It does not conform to the mainstream of the low-carbon green era.
When the network evolves, it is necessary to replace switch equipment on a large scale.
Increased upgrade and maintenance costs
.
in comparison,
"POL passive all-optical"
extremely simple two-layer network architecture
,
It is a natural match for cloud services that mainly carry north-south traffic.
Passive ODN
(Optical
Distribution
)
network replaces aggregation switches.
No power supply required
,
passive instead of active, "0" failure.
When the network evolves, the ODN network and local equipment do not need to be replaced.
Simply upgrade the terminal device.
Easily
and cost-effectively evolve
to next generation networks.
Second round
Bandwidth PK
"Ethernet All-Optical" is sent down to the room through the switch.
Theoretically, 10G bandwidth can be delivered to the room at a 1:1 ratio.
But in reality, it is limited by the bottleneck of the upstream aggregation export bandwidth of the equipment.
And network construction cost considerations,
Convergence is still required.
And "POL passive all-optical",
Backed by PON family
(E/GPON, XG-PON, XGS-PON, 50G PON),
Supporting high
bandwidth
is its strength.
The P2MP architecture complies with the network traffic convergence model.
For example, through flexible splitting ratio configuration,
Dynamically adjust bandwidth to easily achieve 10G bandwidth for a single user
.
And there is no need to change the network wiring.
Round 3
Business support capability competition
Using "Ether All Light",
Limited by the traditional Ethernet network architecture,
In the application of large-scale complex networking scenarios such as universities and large campuses,
Voice, data, video, and security require separate networking.
The cost of network construction and maintenance has greatly increased.
And used "POL passive all-optical",
One optical fiber realizes multiple networks into one.
Simple and economical.
After listening to this duel, everyone should understand.
Ethernet All-Optical
only replaces the transmission medium with optical fiber, and retains the traditional three-layer networking architecture. The aggregation switch needs to be powered separately, which increases the failure rate; multiple services need to be networked independently, which makes maintenance difficult; future network upgrades require
large-
scale
replacement
of switches
.
The real
all-optical network (such as POL passive all-optical)
has been fully upgraded from media to architecture, truly achieving
the simplicity of the two-layer architecture
.
Passive aggregation, green energy saving, one network for all scenarios, one fiber for all services, and smooth network evolution
.
In addition, POL passive all-optical is also the industry-recognized basis for building all-optical ubiquitous access in campuses, and is the deployment practice of F5G in campus scenarios.
All in all, POL is the best choice for users!
—— End of the article ——
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