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Country Differences
D-18 Issue 1 September 1995
*PPM means Periodic Pulse Metering.
Table D-19. United Kingdom
United Kingdom
Tone Detector TN744C TN2182 TN420C TN420B
Tone-Clock TN2182 TN780 TN419B
Call Classifier TN744C TN2182 TN744B
R2MFC Circuit Not
Applicable
Speech Synthesizer TN457
Announcement TN750C TN750B
Auxiliary Trunk TN763D TN417
Analog Direct Inward Dialed (DID) Trunk TN459B TN459
Analog Central Office (CO) Trunk (no PPM *) TN2147C TN2147
Analog Central Office (CO) Trunk (w/PPM *) TN447
4 Wire Tie Trunk TN458
2 Wire Tie Trunk
Digital Central Office (CO)/Direct Inward Dialed
(DID) Trunk
TN464F TN464E TN464D
Digital Tie Trunk TN464F TN464E TN464D TN464C
Digital Integrated Services Digital Network
(ISDN) Central Office (CO) Trunk
TN464F TN464E TN464D
8 port Analog Line TN467
16 port Analog Line TN2183 TN468B TN468
4 Wire Digital Line TN754B TN413
2 Wire Digital Line TN2181
Data Line TN726B