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ATA ATBn ATDmm ATE-n ATHn ATIn ATLn O O 2 BELL 9 300bps ITU-T V21 1200bps ITU-T V22 300bpsB#1CBELL 1200bps BELL ATZ ROM ROM 3 V21 V22 V22B V32 V32B V34 B103 B212 0 src=https:reader043vdocumentinreader043viewer20220306215ae7c75f7f8b9a08778ed14chtml5thumbnails3jpg width=142 height=106 layout=responsive amp-imga divdivdiv class=ts-pagebuttonPage 4button div class=ts-image a href=https:reader043vdocumentinreader043viewer20220306215ae7c75f7f8b9a08778ed14chtml5page4jpg target=_blank amp-img class=ts-thumb alt=Page 4: F On mm # ATA ATBn ATDmm ATE-n ATHn ATIn ATLn O O 2 BELL 9 300bps ITU-T V21 1200bps ITU-T V22 300bpsB#1CBELL 1200bps BELL ATZ ROM ROM 3 V21 V22 V22B V32 V32B V34 B103 B212 0 src=https:reader043vdocumentinreader043viewer20220306215ae7c75f7f8b9a08778ed14chtml5thumbnails4jpg width=142 height=106 layout=responsive amp-imga divdivdiv class=ts-pagebuttonPage 5button div class=ts-image a href=https:reader043vdocumentinreader043viewer20220306215ae7c75f7f8b9a08778ed14chtml5page5jpg target=_blank amp-img class=ts-thumb alt=Page 5: F On mm # 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