Backbone of MTA’s telecommunication network. Seven microwave repeater sites are configured in a loop with the Union Station Gateway Building as the terminal and hub. The network of microwave communications equipment is installed at the Gateway Building, most MTA divisions, and mountain-top radio sites. The microwave system carries the majority of telephone, data and radio traffic throughout Authority facilities. The “loop” represents the configuration of the main backbone radios located at the Gateway, CCF, San Pedro Hill, Division 5, Verdugo Peak, Mount Washington and Rio Hondo. Note also the following term, Telco Lines – voice or data communication lines leased from the local telephone company. MTA uses Telco Lines as backup to the microwave system and in areas where it is not practical or cost-effective to have private lines.