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Joined: Mar 2002
Posts: 411
Member
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Member
Joined: Mar 2002
Posts: 411 |
This is probably more for the more 'experienced' among us but why in the world does 262A switchboard cable have 5 20-pair binder groups instead of 4 25-pair binder groups?
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Joined: Jan 2005
Posts: 15,391 Likes: 14
Moderator-Vertical, Vodavi, 1A2, Outside Wire
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Moderator-Vertical, Vodavi, 1A2, Outside Wire
Joined: Jan 2005
Posts: 15,391 Likes: 14 |
Because it is used almost exclusively within central offices and similar installations where everything is even counts.
When it was used for station cables, this cable had five 25 pair connectors, with only the first 20 pairs wired. This was so that the "fingers" could plug directly into each key strip of a 30 button Call Director telephone set. The violet pairs simply weren't needed.
Ed Vaughn, MBSWWYPBX
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Joined: May 2007
Posts: 5,058 Likes: 5
Moderator-1A2, Cabling
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Moderator-1A2, Cabling
Joined: May 2007
Posts: 5,058 Likes: 5 |
The early WECO K-30 Call Directors did indeed take 100 pair. They were essentially 5, 6-button keystrips in one housing. The same style was used for K-12s & K-18s (there were no K-24s)
The same pattern was used by Stromberg Carlson. When ITT came out with their larger sets, by a careful reuse of spare leads they introduced a K-10 which used only 25 pair, a K-20 that used 50 pair and a K-30 that used only 75 pair.
From that time on (mid to late '70s) we almost never used 262 cable out in the field.
Sam
"Where are we going and why are we in this hand basket?"
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