Model: MC-1-DE
Doc Ref. No:-m05dom102
Issue No:-00
User’s Manual
Page 50 of 76
9 bits for year information
17 bits for binary value of current day seconds
18 bits for control functions Also unused bits are filled with logical zero.
9.2.2.3 IRIG-B AM & IRIG-B DCLS signals:
Figure illustrates primary difference between AM-Amplitude Modulated Signal and DCLS- (Pulse
Width Modulated Signal). IRIG-B AM is distinctive because of the 1 KHz sine wave carrier. It is similar
to IRIG-B DCLS, since Pick-Pick values of the carrier signal follow the same form as IRIG-B DCLS,
which contains information.
Figure 25 IRIG B Waveform
9.2.2.4 IRIG-B IEEE 1344 Extension:
IEEE 1344 protocol has two versions available of which model MC-1-DE supports is IEEE 1344-2005
which defined in IEEE 1344.C37.118TM-2005 document. IEEE 1344.C37.118TM-2005 extends the
Range Commanders Council document by using CF bits of IRIG 200-04. These CF bits are contains
information like Time quality, Time offset to get UTC time from frame etc.
Bit no Designation
Description
50
Year BCD Encoded, BCD 1
Low nibble of BCD encoded Year
51
Year BCD Encoded, BCD 2
52
Year BCD Encoded, BCD 4
53
Year BCD Encoded, BCD 8
54
Separator always Zero
55
Year BCD Encoded, BCD 10
High nibble of BCD encoded Year
56
Year BCD Encoded, BCD 20
57
Year BCD Encoded, BCD 40
58
Year BCD Encoded, BCD 80
59
P6
Position Identifier #6
60
Leap Second Pending (LSP)*
Becomes 1 up to 59 Sec before leap second in-
serted
