English: Telephone Hybrid Transformer at the Interface of the four wire long distance trunk and the two wire local loop, ZB is the balance termination. NBOC is the Network Build Out Capacitor, which is set to the average shunt capacitance through the telephone switch.
The person who associated a work with this deed has dedicated the work to the public domain by waiving all of their rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.
http://creativecommons.org/publicdomain/zero/1.0/deed.enCC0Creative Commons Zero, Public Domain Dedicationfalsefalse
Captions
Add a one-line explanation of what this file represents