Huizhi Guangda: How to choose network high-definition optical transceiver in network high-definition monitoring solution

In the previous issues, several very representative implementations of Huizhi Guangda HD transmission in network HD monitoring projects were released. Some customers and friends asked how to choose network HD optical transceivers in large network monitoring systems. The choice problem may be a problem for many friends in the future, so today Huizhi Guangda ’s engineers will use cases to explain to everyone how large-scale monitoring chooses network high-definition optical transceivers.

1. Case:

This case is a monitoring network project in an urban village, with more than 400 high-definition cameras and a stream of 3 to 4 trillion. The network structure is divided into: access layer-convergence layer-core layer.

Huizhi Guangda HD surveillance transmission makes the following solutions based on this network architecture:

Overall architecture: A three-layer optical network structure is used to build a dedicated monitoring network.

The first layer: access layer. Choose the outdoor lightning protection type high-definition optical transceiver of Huizhiguang 100M access layer.

Mainly used for front-end equipment access.

The second layer: the convergence layer. Use Huizhi Guangda 1000M converged fiber switching matrix.

The optical switching matrix is ​​configured at each aggregation node, and the core layer of the computer room is monitored on the upload link through the 1000M electrical port.

The third layer: the core layer. Huizhi Guangda is responsible for the core Gigabit core optical matrix.

The all-gigabit core optical matrix is ​​mainly responsible for the reception, processing, and storage servers of the front-end gigabit optical data backhaul, the streaming media server, the management server, and the data exchange between access clients.

2. How to choose the high-definition optical transceiver of the access layer network?

Some friends may ask, why does the access layer network high-definition optical transceiver choose 100 megabyte upload instead of gigabit? In fact, this stems from the network bandwidth of the network high-definition optical transceivers: the commonly used network high-definition optical transceivers are divided into hundreds of megabytes and gigabits. Their actual bandwidth is generally only 60 ~ 70% of the theoretical value, so the available bandwidth of their ports is roughly 60Mbps or 600Mbps.

Examples:

Look at the single stream according to the brand of network camera you use, and then estimate how many cameras can be connected to a network high-definition optical transceiver.

For example, 1.3 million: a single stream of 960p camera is usually 4M, with a 100M network high-definition optical transceiver, then 15 units can be connected (15 × 4 = 60M);

With Gigabit network high-definition optical transceiver, it can be connected to 150 (150 × 4 = 600M)

2 million: The single stream of 1080P camera is usually 8M. With 100M network high-definition optical transceiver, 7 units can be connected (7 × 8 = 56M);

With Gigabit network high-definition optical transceiver, you can connect 75 units (75 × 8 = 600M)

These are all explained using the mainstream H.264 camera as an example. H.265 can be halved.

Of course, this is the theoretical maximum, the actual engineering application design should integrate all factors to retain redundancy,

In terms of network topology, a local area network is usually a three-layer structure. The end connected to the camera is the access layer. Generally, it is enough to use a 100M network high-definition optical transceiver. For 8 or less ports, use 100M upload, and for 16 ports / 24 ports or more, use Gigabit upload.

Based on the above characteristics, Huizhi Guangda HD chooses high-definition optical transceivers with less than 8 channels as the access for remote outdoor monitoring. The three types of equipment are:

EW-HD1T-12;

Single-core FC155M fiber interface + 1 10 / 100MRJ45 port to meet the needs of data uplink transmission;

RJ45 port three-level lightning protection is composed of gas discharge tube, TVS / ESD, decoupling device;

The three-level protection of the DC power supply port is composed of a gas discharge tube, TVS, and anti-surge protection device;

DC 12V / 24V can be powered;

EW-HD1T-12

EW-HD47-12

Provides 4 10 / 100M adaptive RJ45 interfaces;

Provides a single-core 155M / FC optical interface;

Power supply: DC 12V / 24V can supply power;

RJ45 interface provides level 2 lightning protection (gas discharge tube + TVS / ESD);

DC power supply interface provides level 3 protection;

EW-HD47-12

EW-HD8T-12

Provides 8 10 / 100M adaptive RJ45 interfaces;

Provides a single-core 155M / FC optical interface;

Power supply: DC 12V / 24V can supply power;

RJ45 interface provides level 2 lightning protection (gas discharge tube + TVS / ESD);

DC power supply interface provides level 3 protection;

EW-HD8T-12

In summary, the front-end access part mainly includes three access devices: EW-HD1T-12, EW-HD47-12, and EW-HD8T-12, which connect all 400 cameras in the village area of ​​the city. system.

3. How to choose the optical switching matrix at the convergence layer

The aggregation layer needs to consider the switching capacity and the link bandwidth converged to the core optical matrix. Because the storage is placed at the core layer, the aggregation layer optical switching matrix has no pressure for video recording, that is, as long as the total bandwidth of the gigabit link upload is calculated, can.

If each optical switching matrix is ​​connected to 8 network high-definition optical transceivers, each network high-definition optical transceiver has 8 cameras, and the code stream is 4M, then the traffic of the convergence layer is: 4Mbps * 8 * 8 = 256Mbps, then the upload of the convergence layer The port must be above 1000M.

According to the characteristics of the project, Huizhi Guangda HD is equipped with a patented 8-channel 100M optical switching matrix at the convergence layer of the monitoring room.

EW-HD8F-GXGF-12:

(1) 8 * single-core SC155M fiber interface + 1 10/100 / 1000MRJ45 port; with more than 120 channels of 1.3 million camera images, fully meeting the needs of data transmission;

(2) Each device is accessed by 8 single-core optical fibers;

(3) Each device is uploaded to the central processing device through 1 RJ45 port;

(4) Power supply: DC 12V power supply;

EW-HD8F-GXGF-12

The convergence receiving system integrates high-definition image signals in all areas of the village in the city. Each device passes 8 single-core optical fibers. The entire system is connected to 56-core single-mode optical fibers to realize the transmission of 400 channels of 1.3 million high-definition images, which satisfies the urban village. The decentralized and centralized management of each monitoring point saves a lot of construction time and shortens the construction period; especially the neat wiring design of the 55-core optical fiber in the village committee monitoring center has won praise from customers.

4. The choice of core layer optical matrix is ​​the top priority

Need to process 3? 4M code streams of 400 cameras at the same time (400 * 4M = 1600M), which means that the core optical matrix needs to support forwarding switching capacity of more than 1600M at the same time, so the core optical matrix needs to support 10 Gigabit port uplink . Generally storage is connected to the core, so video recording is wire-speed forwarding.

But to consider the bandwidth of real-time viewing and monitoring, each connection occupies 4M, and a 1000M link can support 250 cameras to be debugged and called. Each convergence layer optical matrix is ​​connected to 64 cameras, 250/24, which is equivalent to the network can withstand the pressure of 10 users in each camera viewing in real time.

Huizhi Guangda HD is equipped with a full gigabit core optical matrix EW-HD24T-EI at the core layer

A-load 400 road 1.3 million network high-definition camera;

B-Provide convenient WEB management and VLAN division;

C- Has sufficient processing power and interface to deal with system expansion (including NVR access, 110 alarm access, etc.).

According to the above requirements of the customer, all the central processing equipment is adopted: 1 EW-HD24T-EI; this equipment has the following characteristics, which can meet the customer's demand for the central processing system:

(1) -24 Gigabit RJ45 copper ports to meet the loading requirements of 400-channel 1.3 million high-definition cameras;

(2) -Network management function with WEB interface;

(3) -4 10 Gigabit SFP interfaces, with sufficient capacity to deal with system expansion.

The central processing system handles the transmission of 400 channels of 720P-4M high-definition images with load, and meets the needs of system expansion. It maximizes the advantages of the equipment and reflects the high cost performance of the equipment.

EW－HD24T－EI

V. Equipment connection diagram and equipment list of Huizhi Guangda HD transmission system

6. Main product parameters and indicators

7. After-sales service

In terms of after-sales service, we strictly follow the after-sales service system established by ISO9000 certification to provide customers with a comprehensive and rapid service response.

Hardware equipment: All EW series products are guaranteed for three years;

Software system: network management software, providing customers with free online upgrade services.

National free service hotline;

Support 7 * 24 hours service;