| Includes | switching and routing equipment for data communications. |
| Alternate Terms/Abbreviations | CSU/DSU: channel service unit/data service unit. LAN: local area network. WAN: wide area network. |
| See | 25 13 00 for integrated automation control and monitoring network. 27 22 00 for data communications hardware. 27 24 00 for data communications peripheral data equipment. 27 25 00 for data communications software. 27 26 00 for data communications programming and integration services. 28 05 31 for communications equipment for electronic safety and security |