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REVENUE (Tables) | 12 Months Ended
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Dec. 31, 2020
REVENUE |
Schedule of Net revenue | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years ended December 31,
​ |  | 2018 |  | 2019 |  | 2020
​ | ​ | ​ | ​ | ​ | ​ | ​
Colocation services | ​ | 2,104,259 | ​ | 3,261,745 | ​ | 4,710,923
Managed service and others | ​ | 655,231 | ​ | 832,826 | ​ | 1,005,945
Service revenue | ​ | 2,759,490 | ​ | 4,094,571 | ​ | 5,716,868
Equipment sales | ​ | 32,587 | ​ | 27,834 | ​ | 22,104
Total | ​ | 2,792,077 | ​ | 4,122,405 | ​ | 5,738,972

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