Distribution and direct central office (DCO).
Distribution and trunk.
Trunk and branch.
Branch and DCO
To connect the direct central office (DCO) to the private automatic branch exchange (PABX) located on a subscriber’s premise.
For large local offices that use two or more groups of toll-connecting trunks.
To connect a local DCO with a toll center for short-haul traffic
To access the worldwide toll system
White and yellow.
Brown and violet.
Orange and slate.
Blue and green
10.5 to 17.5.
16.5 to 20.5.
19.5 to 23.5.
AF Form 103
AF Form 592.
AF Form 1024.
AF Form 2401
Non-commissioned officer in charge.
Avoid the noise from the engine.
Prevent bends and restrictions in ventilator hose.
Prevent exhaust gases from reentering the subterranean structure.
Avoid congestion in work area so safety equipment can be installed.
Ringing in the ears.
Tingling of the skin.
Watering of the eyes.
Dry or cotton mouth.
Derrick winch system
Support structure system.
Manhole retrieval system.
Plastic duct seal.
Fiberglass duct rodders.
Quick-coupling duct rods.
Screw-coupling duct rods
Aid in removing cable from the cable reel stand.
Prevent the cable reel jack from tipping over.
Support the cable reel on the cable reel jack
Break the cable reel on the cable reel trailer.