Model: MC-1-M (2U)
Doc. Ref. no. : m05/om/101
Issue no. 14
User’s Manual
Page 70 of 103
BCD 8
69
P7
Position Identifier #7
70
Time Zone Offset 0.5 Hour
0 = none, 1=additional 0.5 hour time-zone offset
71
Time Quality
4-bit code representing approx clock time error.
0000 = MC-1-M Locked, maximum accuracy
1111 = MC-1-M failed, data unreliable
72
Time Quality
73
Time Quality
74
Time Quality
75
Parity
Parity on All preceding data bits including time of
year
76
Not Used
Unassigned, Zero Value
77
Not Used
Unassigned, Zero Value
78
Not Used
Unassigned, Zero Value
79
P8
Position Identifier #8
Table 11.4: Assignment of CF Segment for IEEE 1344(C37.118-2005)
To use these extra bits of information, protective Relays, RTU’s and other equipment receiving the time
code must be able to decode them.
In IEEE 1344 C37.118-2005 Leap Second, Leap Second Pending, Day Light
Saving Time, Day Light Saving Time Pending bits are not supported in this
firmware version.
11.2.2.5
Generated IRIG-B Time Codes:
GPS Master Clock model MC-1-M supports different IRIG-B 00x/IRIG-B12x protocols. Supported
protocols are listed below.
a) IRIG-B007
: 100 pps, DCLS Signal, No carrier Frequency
BCDTOY, BCDYR, SBS (Time of Day)
b) IRIG-B127
: 100 pps, AM Signal, 1 KHz carrier Frequency
BCDTOY, BCDYR, SBS (Time of Day)
c) IEEE 1344 (C37.118-2005) : 100 pps, AM Signal, with 1 KHz Carrier frequency
BCDTOY, BCDYR, SBS, IEEE1344 assignment of CF bits (Refer
Section 11.2.2.4)
: 100 pps, DCLS Signal, No Carrier Frequency
BCDTOY, BCDYR, SBS, IEEE1344 assignment of CF bits (Refer
Section 11.2.2.4)
11.2.2.6
Selection/configuration of IRIG-B Time Codes:
The time code generated can be selected/configured using Telnet menu available on model MC-1-M
Ethernet port NTP1.
IRIG-B time code for model MC-1-M can be configured for
1) IEEE 1344 C37.118 – 2005 protocol enabling
2) UTC time on IRIG-B time code or Local time on IRIG-B time code.
