In 2019, the Arkhangelskoye Museum-Estate celebrated its 100th anniversary, colossal restoration work was carried out there. Normal Wi-Fi was introduced in the park so that art lovers could ask Alice what they see and what the artist wanted to say, and the couples on the benches could post selfies between kisses. Couples generally love this park very much and buy tickets, but every year the lack of a selfie saddens them more and more.
There is no cell coverage here, because the entire territory is a particularly valuable object of the cultural heritage of the Russian Federation, plus there is a sanatorium of the Ministry of Defense nearby. There is a big problem with the placement of towers: you can’t just by the design code, and there are simply no suitable sites inside. Mobile operators in such situations do a very simple thing: they put towers outside so that they “shine” on the museum territory. But outside the territory of the museum is guarded by the National Guard. As I said above, according to the safety standard, there are no towers there.
To solve the problem (lack of mobile operators in the park), we proposed to make Wi-Fi coverage here and now.
Task
The Arkhangelskoye Estate Museum set the task of designing a telecom part indoors and in park areas. Basically, we are talking about SCS and Wi-Fi zones. In parallel, it is necessary to design a monitoring system and several other subsystems that are important for the park. Since there is public Wi-Fi, it is also necessary to deploy an authentication server (it is impossible by law without a passport or a cell number), protection (firewalls) and organize a server room for the network core.
The specificity of the object is that it is a cultural heritage. That is, if this is a building, then most often something can only be screwed into the underground space, either inside some furniture, or somewhere else. Cable cannot be run. All movements are coordinated with the architectural committee. Plus special permits from the Ministry of Culture and so on.
The first part of the project is Wi-Fi coverage:
As you can see, the park is very large, so we first identified the main crowds of people and "covered" them with access points. First of all, we are talking about the main alley
and buildings. The main alley is ready, you can test it. Some of the buildings are in the next stage.
Access points are used in two types: with a narrow and wide radiation pattern. Equipment Models:
Cisco-AP 1562d MO and Cisco-AP 1562iIn public places, there is a big emphasis on aesthetics, so external antennas on access points would be out of place. The Cisco AP1562D access point has a built-in antenna that allows you to direct the signal in the right direction - to the alley, and not to the trees, at the same time, this directional antenna is built into the case and does not interfere with the aesthetics.
In the case of the alley, there were no problems with the installation of the outlets themselves: remake lanterns were already installed there, and the architectural committee allowed the boxes to be mounted on them. Not entirely aesthetically pleasing, but objectively there were no other options, since one of the requirements was sufficient height so that the access point would not be stolen:
It is impossible to power points from lanterns: they are turned off during the day
It was much more difficult to bring SCS to them. You can dig in the park, but each tree is protected separately, so it was necessary to coordinate the trenches very clearly with centimeter accuracy. They zigzag around the plants:
Power and optics. Distances too long for PoE
Since they all have such an irregular shape, it was impossible to dig with equipment, only with your hands. Lots of neat work.
For SCS there was, one might say, double protection. Special hatches for communications with adapters and more mastic on top. Well plastic KKTM-1. The second was KKT-1. M is small. These are sealed hatches that are closed and opened with a special key, there is such a key for the well cover:
We just put 70 of them, and KKT-1 - in front of the entrance to the building. An input to the communications building was made from it. Communications were introduced through adapters (pressurized input calipers). They are respectively different diameters - 32 mm, 63 mm and 110 mm. And outside, all this was covered with a bitumen-polymer waterproofing mastic, namely the entry point.
If you shy away a tree at the installation, then the worker will go to prison for five years
There are no excavators in the park, but there are gardeners. According to the norms for laying communications, we laid a signal warning tape on all pipes from the outside, and sprinkled soil on top. So that in the future, if people carry out work in this place, they see it and understand that somewhere in the area there are communications for half a bayonet, and not cut them. It took two kilometers of this tape. It was also agreed with environmentalists - it is neutral, specially reinforced, it decomposes in the ground in 30-40 years.
Access points for HD coverage - like in stadiums. The 1560 Series APs feature a custom hardened hardware platform that can withstand the rigors of large public events. Arkhangelsk hosts the same Usadba Jazz, a music festival with a possible capacity of 100 people. Therefore, such points are located on the Imperial Alley in the northern part, near the museum, near the theater (this, by the way, is a monument of world importance, and it is located across the highway from the main territory - it will be necessary to lead the SCS through the HDD puncture under the road).
In the buildings themselves and around them, it is generally very difficult to install. This is a compromise between beauty and rationalism: lamps have already been placed there, and they are not visible from the outside. We decided that we could skip one more box.
Hotspot works down to -40 Celsius
We also created an authorization portal. He asks to enter a phone number, then generates a call, and the last four digits of the incoming phone number must be entered in the authorization code field. From the points, statistics are collected on the number of devices in the network and the reappearance of MACs in the park.
The network is built on Tsisk, so that the museum subsequently minimally maintains the infrastructure. The solution is chosen so that during the operation of the network the customer does not spend a lot of money on technical support. The infrastructure will work for several years, reliably and without downtime, without requiring replacement of equipment.
It turned out to be a hybrid solution: somewhere industrial modules for tough operation, and somewhere almost home-made. Switches are near-household. The core is such that there are enough ports for expansion. Duplicate catalysts.
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Source: habr.com