( ). , , RS-232 ( V.24), - , , V.35, G.703.
, PDH SDH, 64 / 2 / G.703, .
. G.703 (" "). PDH, SDH (, 155.520 / 1991 ), , - .
Ø ITU- G.703 .
, () 64 /, , PDH : - 1544, 6312, 32064, 44736 /, - 2048, 8448, 34368, 139264 /, , (. 1-2), - , - 97728 /. , SDH , 155.52 / ( SDH ITU-T G.957 [24]).
n 64 / (n = 2,3,...,31), , 2048 /, , 2048 /. 1544 /, ( = 2,3,...,23) , 1544 /.
64 /, : 64 /, , , 64 8 .
(- -) : (), (), ().
(codirectional interface) - , , () : : (. 2-50).
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(contradirectional interface) - , ; , (.2-51).
(centralized clock interface) - , , (.2-52).