interesting wiring/question

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Re: interesting wiring/question jeffmoss26 #594317 10/26/15 07:51 PM
Joined: Sep 2006 Posts: 3,290 Shelter Island, New York Arthur P. Bloom Member
Arthur P. Bloom Member Joined: Sep 2006 Posts: 3,290 Shelter Island, New York	The 4 wires going to each relay are a 10Vac wire, a -24Vdc wire, a ground, and (maybe) another ground. It appears that a 10 Volt A-C signal is being converted to a -24 Volt D-C signal (or vice-versa) at each relay. Perhaps to use a dial-selective intercom to operate 5 individual devices. I think I see that one relay is stamped "24 VDC" on its cover. That would mean that the coil uses 24 VDC. The metal plates seem to have Bell-System-esque ink-stamped date labeling, but the relays are COTS, not WE. ISTR that the Horizon retrofit relays were installed at the KSU and fed a pair (instead of two pair) to each SLT. Later Horizon SLT line cards had the 1-pair modification built in. These critters are definitely not WE / Horizon items, and the wiring is not done in pairs, as one would expect T&R / ringing wiring to be done. Arthur P. Bloom "30 years of faithful service...15 years on hold"

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Re: interesting wiring/question jeffmoss26 #594319 10/26/15 08:10 PM
Joined: Dec 2002 Posts: 9,428 Likes: 1 Beachwood jeffmoss26 Member
jeffmoss26 Member Joined: Dec 2002 Posts: 9,428 Likes: 1 Beachwood	Arthur, what is COTS? Thanks for the info guys...the mystery continues. The 5 single pair cords (T1R1, T2R2 etc) were plugged into 5 CO lines (disconnected at the block end) Last edited by jeffmoss26; 10/26/15 08:11 PM. Jeff Moss Moss Communications Computer Repair-Networking-Cabling MBSWWYPBX, JGAE

Re: interesting wiring/question jeffmoss26 #594322 10/26/15 09:11 PM
Joined: Jan 2007 Posts: 1,020 N/W New Jersey John807 Member
John807 Member Joined: Jan 2007 Posts: 1,020 N/W New Jersey	On a limb here could have been paging? John 807

Re: interesting wiring/question jeffmoss26 #594324 10/26/15 09:22 PM
Joined: Sep 2006 Posts: 3,290 Shelter Island, New York Arthur P. Bloom Member
Arthur P. Bloom Member Joined: Sep 2006 Posts: 3,290 Shelter Island, New York	COTS = Commercial Off The Shelf Arthur P. Bloom "30 years of faithful service...15 years on hold"

Re: interesting wiring/question jeffmoss26 #594326 10/26/15 10:10 PM
Joined: Dec 2005 Posts: 9,178 Likes: 8 Arlington, Massachusetts dexman Spam Hunter
dexman Spam Hunter Joined: Dec 2005 Posts: 9,178 Likes: 8 Arlington, Massachusetts	In Central Office lingo...COT = Continuity Test particularly SS7 trunking. I Love FEATURE 00