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Registered Jack - Glossary
USOC Registered Jacks
BS
BS 6312
| There are two types of modern British Telecom plugs — 431A and 631A. 431A is 4-way and 631A 6-way (see RJ11). They fit a standard "type 600" telephone socket. There are also plugs with only two contacts commonly seen on modem leads. |
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