Telecommunications Network – ISD

Telecommunications Network

Connecting the County with technology services.

ISD Telecommunications provides cost-effective and reliable voice, data and video communications through a vast telecommunications network. Supporting over 100,000 County telephone lines and over 40,000 personal computers, Our telecommunications services include:

  • Voice and video applications
  • Telephone installation, support and maintenance
  • LAN/WAN operations
  • Videoconferencing
  • Radio systems
  • Countywide emergency communications coordination

Find out more about the services offered through Telecommunications by clicking below to view the ITS Service Catalog.

County employees experiencing IT issues, log in to the eService Portal to submit your request.

Service Owner

Deputy General Manager
Telecommunications Branch,
Information Technology Services

9150 E. Imperial Highway
Downey, CA 90242


ISD develops and maintains custom applications to support vital operations for County Departments on a wide variety of platforms including mainframe systems, web and mobile applications, GIS applications, and software-as-a-service.
ISD Data Centers process millions of transactions each day from over 40,000 computers. Information Technology Services is implementing state-of-the-art technologies for cloud computing, network security, and disaster recovery.
Los Angeles County's communications network includes more than 13,000 mobile phones, 800 network locations and 100,000 telephone lines. ISD also supports the Countywide Integrated Radio System which ensures essential services in a crisis.
ISD Shared Technology Services manages several critical Countywide systems including Countywide email, the Customer Assistance Center Help Desk and 4-1-1 Information Line as well as field services for computer workstation and business machines support.