mos.directory

Navy NEC · Communications

747A Central Office Exchange Technician

Current service use not established

This code is listed in the directory. Inclusion alone does not confirm current service use.

A Navy Enlisted Classification: a skill designation sailors hold in addition to their rating.

Browse Navy

Overview

A Central Office Exchange Technician installs, tests, and maintains digital and fiber optic cable circuits and lines for telephone systems and C4 computer systems. This technician supports single-line and multiline telephone systems and associated equipment, and monitors and analyzes digital switching performance through logs and operational reports.

Core Skills

  • Digital and fiber optic circuit testing
  • Switching performance analysis using operational logs
  • Cable circuit maintenance for C4 systems

Civilian Career Paths

Career associations are editorial assessments of the cited evidence, not an official crosswalk unless the evidence explicitly says so. O*NET supplies civilian occupation information, not proof of a military match. Related experience does not confer civilian qualifications. Tasks and tools below describe civilian work, not military training.

Telecommunications Equipment Installers and Repairers, Except Line Installers

Installing, testing, and maintaining digital and fiber optic telephone circuits directly overlaps with civilian telecommunications equipment installation and testing.

How to prepare: Prepare a work sample showing a telephone circuit installation, its test results, and the steps used to verify equipment operation.

What the civilian work involves
  • Test circuits and components of malfunctioning telecommunications equipment to isolate sources of malfunctions, using test meters, circuit diagrams, polarity probes, and other hand tools.
  • Test repaired, newly installed, or updated equipment to ensure that it functions properly and conforms to specifications, using test equipment and observation.
  • Assemble and install communication equipment such as data and telephone communication lines, wiring, switching equipment, wiring frames, power apparatus, computer systems, and networks.
Civilian tools and software (examples)
  • Cisco IOS

Computer Network Support Specialists

Testing circuits for C4 computer systems and analyzing digital switching logs provides a foundation for network diagnostics and support.

How to prepare: Complete a hands-on network troubleshooting lab that uses diagnostic software to identify a connectivity fault and document its resolution.

What the civilian work involves
  • Identify the causes of networking problems, using diagnostic testing software and equipment.
  • Document network support activities.
Civilian tools and software (examples)
  • Linux
  • Microsoft Windows Server

Notes & Sources

Evidence for this guidance (3 documents)
  1. NAVPERS 18068F Vol II (NEOCS, Jul 2026 edition): NEC 747A

    [1] NEC entry "747A - Central Office Exchange Technician"; cached text line 17798; NAVPERS 18068F Vol II, 2026-07 edition

    Supports: Digital and fiber optic circuit testing, Switching performance analysis using operational logs, Cable circuit maintenance for C4 systems, Telecommunications Equipment Installers and Repairers, Except Line Installers (O*NET 49-2022.00), Computer Network Support Specialists (O*NET 15-1231.00)

  2. O*NET: Telecommunications Equipment Installers and Repairers, Except Line Installers

    [2] O*NET 30.3 occupational data

    Supports: Telecommunications Equipment Installers and Repairers, Except Line Installers (O*NET 49-2022.00)

  3. O*NET: Computer Network Support Specialists

    [3] O*NET 30.3 occupational data

    Supports: Computer Network Support Specialists (O*NET 15-1231.00)

Defense contractor jobs for 747A

Descriptions may be summarized for clarity. Verify all information with your branch career counselor or official military documentation before making career decisions.

Report an error on this page