Analysis of information sources in references of the Wikipedia article "Wetting current" in English language version.
[…] Wynn Quon: The Bellcore Layer 1 specs talk about "sealing current". This is a low current (1-20mA) DC signal applied to tip and ring. […] It is supposed to reduce oxidation at line splices and it provides a troubleshooting aid in the field. […] Brad Bennett: I was personally the researcher that did the sealing current work while at Bellcore […] sealing current does effectively keep a copper loop intact (through a process called electromigration […] it does work on copper loops which have splices […] for direct copper loops (CO to customer sites) it is ALWAYS supposed to be applied (and is built into the line cards). For other technologies (e.g. BRITE cards), which synthesize ISDN from 3 DS0 circuits at a subscriber loop cabinet (SLC), I am […] not sure it is a requirement. […] other interesting upshots of […] this work, which I am not certain have ever made it to the public. For example there are certain metal pairs [for] which you definitely do NOT want to use sealing current […] or […] run any continuous DC current (e.g. copper and precious metals). Such contacts (splices) are materially designed to fail if current continually flows in the wrong direction. […] on […] copper wires, sealing current helps to maintain good electrical connections […]
