With the development of clinical informatization, the hospital has gradually realized paperless, film free and wireless. With the continuous maturity and popularization of WLAN technology, the application of WLAN in the global medical industry has become a trend. As a supplement to the hospital wired LAN, WLAN effectively overcomes the shortcomings of wired network. It uses tablet computers, wireless and mobile vehicles to collect vital sign data, query medical data input anytime and anywhere, doctor rounds, bedside care, telephone communication, patient identification code identification, etc., so as to give full play to the effectiveness of medical information system and highlight the technical advantages of digital hospital. At the same time, the perfect wireless coverage of access control and attendance gate system can also improve patients' satisfaction with hospital services.

Solution of hospital wireless coverage system

requirement analysis

The demand analysis of hospital wireless coverage is as follows:
1. Meet the wireless coverage of all areas such as registration area, outpatient area and inpatient area;
2. Due to large traffic, it is necessary to meet the requirements of automatic switching of access points and business line continuity, i.e. wireless roaming;
3. Due to the uneven distribution of terminals, automatic load balancing is required to ensure the use effect of wireless network;
4. Wireless network is mainly used for doctors' internal office and patients' Internet access. The AP needs to support setting multiple SSIDs. Different SSIDs have different network permissions;
5. High requirements for wireless security, especially for office networks, identity authentication must be carried out to restrict illegal terminal access, such as MAC address authentication;
6. The appearance of AP shall be beautiful and generous, and Poe power supply shall be supported to meet the needs of fire fighting and wiring;
7. AP supports unified management, configuration and real-time monitoring of AP working status, which is convenient for operation and maintenance;

The overall environment of the hospital registration office is relatively open and there are few obstacles. In an open environment, the ceiling covers an area with a diameter of 20-30 meters. The number of APS can be determined according to the scale, and the distribution points are evenly distributed:

AP arrangements for the registered office
The structure of outpatient department and inpatient department is similar. The ceiling AP can be installed in corridors with a radius of 10-12m. The number of APS can be determined according to the actual environment. As shown in the figure:

AP layout of outpatient and inpatient buildings

Characteristics of the plan
The scheme uses commercial wireless products to achieve coverage, and uses wireless controller AC and fit AP for deployment. It has the following characteristics:

High availability: AP adopts professional antenna, and the transmission power is linearly adjustable. According to the actual environment, the transmission power of AP can be reasonably adjusted to meet the coverage requirements of different areas.

Flexible roaming: fit AP wireless deployment architecture can set different APS to transmit the same SSID. When the wireless terminal moves between different APS under the same VLAN, it can quickly switch between different APS to realize rapid roaming across two layers of AP.

High reliability: the fit AP scheme is adopted to support load balancing. AC can dynamically adjust the uniform distribution of users between different APS to prevent overload of a single AP.

High scalability: support MAC authentication, portal authentication and other user access authentication methods. SMS authentication, wechat authentication and other authentication methods can be realized in combination with external portal server and authentication server.

Easy deployment: AP adopts 86 panel design, which is beautiful and generous. It supports 802.3af standard Poe network cable power supply. It can directly replace the original network panel without rewiring and damaging the decoration of the original room. The construction is simple.

Manageability: the FTT AP is uniformly managed by the wireless controller AC, automatically discovers and manages the AP, and views the AP operation status in real time to facilitate network management and maintenance.

Equipment selection

To establish a stable and practical wireless network, we must select the appropriate network equipment. The complete solution of wireless network includes router, switch, Poe device, AP, AC controller and other devices. Due to different scales and needs, different hospital network solutions may need different equipment, which requires a variety of network equipment to meet different needs.

When selecting AP for wireless coverage, the following points should be considered:

Environmental characteristics: outdoor or indoor, sparse terminal distribution (such as warehouse) or high-density wireless access (such as conference room, multi-function hall, etc.).

Installation method: ceiling, panel or 86 box.
Power supply mode: Standard POE (802.3af or 802.3at), passive Poe or DC (DC power supply).
Coverage: single room, multi room, regional coverage, fixed-point coverage, etc.
Capacity: 10, 20, 30 or 50 terminals connected to one AP.
Taking the hotel environment as an example, different products can be used in different fields:
The common ceiling wireless AP is selected for the general guest room area, which can meet the wireless coverage of most areas, and a small number of wireless blind areas are appropriately allowed. The panel wireless AP can be used in guest room areas such as luxury rooms to ensure wireless coverage and provide accommodation experience. Catering, conference room and other densely populated areas adopt hoisting dual band wireless AP to support high-density access and meet the needs of multi-channel simultaneous access.

Should the AP choose 2.4G single frequency or 2.4g/5g dual frequency?

From the perspective of terminal products in the current market, smart phones with a specification of 1000 yuan can basically support 5g band WiFi. Therefore, in order to have a better wireless experience, we recommend dual band wireless AP, especially in densely populated areas.

How many clients are suitable for a wireless AP?

Based on the working principle of wireless products and the wireless transceiver capacity of wireless terminals such as mobile phones, it is impossible for a wireless AP to achieve "a radius of 1 km and access hundreds of people".

Based on our experience, we recommend 25 customers' single frequency APS and 50 customers' dual frequency APS.

What is the coverage of wireless AP?
The coverage of wireless AP is closely related to the installation location and actual environment. The following information is for reference:

Ceiling wireless AP: covering 6 rooms / dormitories, with a radius of about 12m. It is suitable for installation in an open environment with a floor height of no less than 3m. Due to the characteristics of installation mode, it is easy to produce wireless blind spots.

Panel wireless AP: covering 2 rooms / dormitories and 1-2 walls. Good wireless coverage.

How to select the correct slope conversion?

The POE switch can be used as both a power supply (PSE) and an access switch. When selecting Poe switch, the following aspects can be considered:

1. Physical port

Poe switch is usually used to connect the power receiving terminal as an access switch. The number of Poe power supply ports supported by the switch is considered according to the number of receiving power terminal devices. In addition, the rate that the port needs to support needs to be considered according to the power receiving terminal and service requirements. For example, if the AP port is Gigabit and 11ac or dual band is used, Gigabit access can be considered.

2. Power parameters

Select the appropriate switch according to the power supply protocol (such as 802.3af, 802.3at or non-standard POE) supported by the power receiving end (AP or IPC), and the POE power supply protocol supported by the switch shall be consistent with that of the receiving end.

3. Manageability

Poe switches are divided into managed Poe switches and basic Poe switches. The basic Poe switch mainly provides Poe power supply port, which can be used directly without configuration. In addition to providing Poe power supply, the managed Poe switch can also flexibly configure the port power supply time and priority, and formulate a more reasonable power supply scheme.

4. Common functions

802.1Q VLAN function is a common VLAN division function in LAN, which can divide multiple isolated VLANs; DHCP interception can prevent the access of other DHCP servers from affecting the LAN; Port isolation can isolate communication between each port. When selecting a product, you can select the POE switch that supports the above functions as needed.

How to select the correct switch?

As the core equipment of LAN data forwarding, the performance and function of switch determine the manageability and data forwarding performance of LAN. The following aspects shall be considered when selecting the switch:

1. Is this switch easy to operate?

Switches are divided into management switches and basic switches. The basic switch is mainly an expansion port without plug and play configuration; The management switch provides rich management functions, such as VLAN division, port security, rate management, etc.

2. Physical port

The number of physical ports supported by the switch determines the number of terminals or auxiliary devices connected to the switch. It needs to be selected according to the actual needs. Of course, it also needs to consider the subsequent network expansion. The access port of the switch is used to connect the internal network terminal, and the uplink port is used to connect the superior equipment. In order to support 100m or Gigabit speeds, different port types should be considered.

3. Special ports

If the access terminal is a Poe device, consider whether the switch port needs to support Poe power supply; For long-distance transmission, it is necessary to consider supporting optical fiber interface.

4. Function support

VLANs are divided to recognize that ports belonging to different VLANs are inaccessible to each other; Set up static routing to realize the mutual access of VLANs in different network segments; DHCP monitoring prevents the access of other DHCP servers from affecting the LAN; The above functions are commonly used in large and medium-sized LAN.

5. Other functions
Access control, 802.1x authentication, loopback detection, Quad binding, IGMP snooping, etc.

The switch is not an example, which we are already familiar with.

How to select the correct router?

As the Internet outlet of the whole LAN, router determines the performance, application and network security of the whole network

1. Occasion of use

At present, there are enterprise routers, Internet bar routers, home routers, etc. Please select the appropriate type according to the use situation.

2. Wireless function

Whether the router supports wireless function, please select the appropriate router according to the type of terminal you visit (desktop, notebook, mobile phone, etc.).

3. Bearing capacity

Different routers have different carrying capacity. In order to reduce the cost and ensure the normal operation of the network, an appropriate model should be selected according to the number of terminals connected to the network.

4. Number and rate of Wan ports

The number and rate of Wan ports supported by different types of routers are different. The number of Wan ports ranges from 1 to 4. The speed of Wan ports supports 10 / 100M or 10 / 100M / 1000m. Please select the appropriate model according to the actual environment of broadband line access.

5. Authentication function

PPPoE server, web authentication, wechat authentication and other authentication methods support different types of routers. Therefore, we need to select the corresponding router according to the network access authentication requirements.

6. Other application functions

VPN types are supported, such as IPSec VPN, PPTP VPN and L2TP VPN. Support online behavior management methods, such as application restriction, website filtering, etc.

7. Scalability
No network is immutable. You need to consider the network scale and application expansion needs of the network equipment you currently purchase in the short and medium term, and select the appropriate equipment according to the requirements of subsequent planning.