| Includes | copper and optical fiber outside facility. |
| Alternate Terms/Abbreviations | ISDN: integrated services digital network. |
| See | 27 05 26 for grounding and bonding for facility communications systems. 27 10 00 for facility structured cabling. 27 13 00 for communications backbone cabling. 27 13 13 for communications copper backbone cabling. 27 13 23 for communications optical fiber backbone cabling. 27 13 33 for communications coaxial backbone cabling. 33 79 19 for utilities grounding. |