The word "maintenance" is a man-made word, artificial word, not in line with the norms of grammatical use of words, the use of the person's original intention refers to the maintenance. In fact, the "maintenance" is taken out of context.
"Maintenance" generally refers to the maintenance contract signed by the party involved in the maintenance and the other side of the contract.
The origin of the maintenance contract: for telecommunications equipment, generally in the signing of the equipment contract, will include a certain period of warranty, half a year to a year. Generally, the warranty period is based on the relevant provisions in the equipment contract, and the usual practice is to start with the PAC.
In general, a complete network project will include some of the following processes: At the beginning of the project, equipment vendors, such as Ericsson, Siemens, Nokia, Motorola, Nortel, Huawei, and ZTE, etc., will conduct market guidance.