XRT72L56 Datasheet, PDF (251/486 Pages) Exar Corporation – SIX CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER

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SIX CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER
PRELIMINARY
XRT72L56
REV. P1.1.2
TABLE 45: THE RELATIONSHIP BETWEEN THE NUMBER OF RXOHENABLE OUTPUT PULSES ((SINCE RXOHFRAME
WAS LAST SAMPLED "HIGH") TO THE DS3 OVERHEAD BIT, THAT IS BEING OUTPUT VIA THE RXOH OUTPUT PIN
NUMBER OF RXOHENABLE OUTPUT PULSES
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
THE OVERHEAD BIT BEING OUTPUT BY THE
XRT72L56
F1
M1
F1
UDL
FO
UDL
FO
UDL
F1
M0
F1
UDL
F0
UDL
F0
UDL
F1
Figure 91 presents the typical behavior of the Re-
ceive Overhead Data Output Interface block, when
Method 2 is being used to sample the incoming DS3
overhead bits.
232