Country Differences
Table D-19. United Kingdom
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| United Kingdom |
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Tone Detector |
| TN744C | TN2182 | TN420C | TN420B |
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| TN2182 | TN780 | TN419B |
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Call Classifier |
| TN744C | TN2182 | TN744B |
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R2MFC Circuit |
| Not |
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| Applicable |
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Speech Synthesizer |
| TN457 |
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Announcement |
| TN750C | TN750B |
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Auxiliary Trunk |
| TN763D | TN417 |
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Analog Direct Inward Dialed (DID) Trunk |
| TN459B | TN459 |
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Analog Central Office (CO) Trunk (no PPM *) |
| TN2147C | TN2147 |
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Analog Central Office (CO) Trunk (w/PPM *) |
| TN447 |
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4 Wire Tie Trunk |
| TN458 |
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2 Wire Tie Trunk |
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Digital Central Office (CO)/Direct Inward Dialed |
| TN464F | TN464E | TN464D |
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(DID) Trunk |
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Digital Tie Trunk |
| TN464F | TN464E | TN464D | TN464C |
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Digital Integrated Services Digital Network |
| TN464F | TN464E | TN464D |
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(ISDN) Central Office (CO) Trunk |
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8 port Analog Line |
| TN467 |
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16 port Analog Line |
| TN2183 | TN468B | TN468 |
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4 Wire Digital Line |
| TN754B | TN413 |
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2 Wire Digital Line |
| TN2181 |
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Data Line |
| TN726B |
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*PPM means Periodic Pulse Metering.
