Bell wire: Difference between revisions
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Be clearer on microfilters. Add table for pin allocation |
m Get the table headings in the right order. |
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! Pin number !! Function !! Notes |
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| 1 || || |
| 1 || || ''For non-telephone facility'' ?? |
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| 2 || 'B' wire || Used to be guaranteed more negative voltage than 'A' wire |
| 2 || 'B' wire || Used to be guaranteed more negative voltage than 'A' wire |
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| 4 || Local earth || ''Needed for 'C' wire signalling, which is obsolete'' |
| 4 || Local earth || ''Needed for 'C' wire signalling, which is obsolete'' |
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| 5 || 'A' wire || |
| 5 || 'A' wire || |
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| 6 || 'C' wire || '' 'C' wire signalling is obsolete'' |
| 6 || 'C' wire || '' 'C' wire signalling is obsolete'' |
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