You first need to get a grip on the fact that wireline distribution systems are breathing their last gasp. Fiber to the premise and 5G are replacing copper distribution systems. Packet switched networks are replacing circuit switched networks. If you are a young telecom worker who doesn't fully understand every work of what I just said, you need to get busy with some certification training. The Cisco Certified Entry Network Technician (CCENT) and Cisco Certified Network Associate (CCNA) are a good place to start, then you can move on to the CCDP if you want to go into engineering, planning, and design of networks. The worst mistake you can make is thinking that the company is going to train you. They are going to use you to operate their rapidly dying copper network until the last line is disconnected, and then lay you off. The ones who will be employed soon are the ones who take the initiative for themselves to get a step ahead. Here are a couple of links to help you do that. One is a year and a half old, but it is still a good article. Also look for some training from the front-runner 5G equipment manufacturing companies like Ciena. The telecom industry will be moving forward in even greater strides than before. The only question is whether or not you will be moving with it.
https://www.businessnewsdaily.com/10764-best-telecommunications-certifications-2018.html
https://it-certification-courses.com/courses/11-cisco-ccna-ccent-boot-camp