CHAPTER 2: THEORY OF OPERATION
THE IRIG-B TIME CODE STANDARD
MULTISYNC 100 GPS CLOCK – INSTRUCTION MANUAL
11
With the IEEE 1344 extensions OFF (no BCD
YEAR
) these time codes are B002 and B122; with
the IEEE 1344 extensions ON, these codes are BOO6 and B126. These time codes are
defined by the clock settings as well as the ability of IEDs connected to the clock to support
these implementations. A limitation of IRIG is that there can be only one time code on any
clock connection string.
IRIG-B in the MultiSync 100 1588 GPS Clock
The MultiSync 100 has two TTL (coaxial) output ports, each of which can be configured to
provide an IRIG-B time signal, independent of the other port. The MultiSync 100 supports
both DC Level Shift and Modified Manchester time codes. The complete time code
designations supported are:
•
B002
: DC Level Shift, only BCD
TOY
in the time code.
On the GE Configuration tool
I/O
tab:
–
Under
IRIG-B / Pulse Output Port
select
IRIG-B
, and set
Modulation
to
DCLS
.
–
Under
IRIG-B Stream
, set
Extensions
to
None
, and leave
Binary code in seconds
unchecked.
•
B006
: DC Level Shift, BCD
TOY
and BCD
YEAR
in the time code.
On the GE Configuration tool
I/O
tab:
–
Under
IRIG-B / Pulse Output Port
select
IRIG-B
, and set
Modulation
to
DCLS
.
–
Under
IRIG-B Stream
, set
Extensions
to
C37.118
, and leave
Binary code in
seconds
unchecked.
•
B007
: DC Level Shift, BCD
TOY
, BCD
YEAR
, and SBS in the time code.
On the GE Configuration tool
I/O
tab:
–
Under
IRIG-B / Pulse Output Port
select
IRIG-B
, and set
Modulation
to
DCLS
.
–
Under
IRIG-B Stream
, set
Extensions
to
C37.118
, and check
Binary code in
seconds
.
•
B232
: Modified Manchester, only BCD
TOY
in the time code.
On the GE Configuration tool
I/O
tab:
–
Under
IRIG-B / Pulse Output Port
select
IRIG-B
, and set
Modulation
to
Modified
Manchester
.
–
Under
IRIG-B Stream
, set
Extensions
to
None
, and leave
Binary code in seconds
unchecked.
•
B236
: Modified Manchester, BCD
TOY
and BCD
YEAR
in the time code.
On the GE Configuration tool
I/O
tab:
–
Under
IRIG-B / Pulse Output Port
select
IRIG-B
, and set
Modulation
to
Modified
Manchester
.
–
Under
IRIG-B Stream
, set
Extensions
to
C37.118
, and leave
Binary code in
seconds
unchecked.
•
B237
: Modified Manchester, BCD
TOY
, BCD
YEAR
, and SBS in the time code.
On the GE Configuration tool
I/O
tab:
–
Under
IRIG-B / Pulse Output Port
select
IRIG-B
, and set
Modulation
to
Modified
Manchester
.
–
Under
IRIG-B Stream
, set
Extensions
to
C37.118
, and check
Binary code in
seconds
.