Model: MC-1-DE
Doc Ref. No:-m05dom102
Issue No:-00
User’s Manual
Page 52 of 76
BCDTOY, BCDYR, SBS, IEEE1344 assignment of CF bits
(Refer Section 9.2.2.4)
9.2.2.6 Selection/configuration of IRIG-B Time Codes:
The time code generated can be selected/configured using Telnet menu as well as through serial
configuration available on model MC-1-DE Ethernet port NTP1 and serial port.
IRIG-B time code for model MC-1-DE can be configured for
•
IEEE 1344 C37.118 – 2005 protocol enabling
•
UTC time on IRIG-B time code or Local time on IRIG-B time code.
IRIG-B DCLS time codes (IRIG-B 00x) and IRIG-B AM time codes (IRIG-B 12x) are always generated
simultaneously. Using telnet if we configure the IRIG-B output for IEEE 1344 protocol than both IRIG-
B00x and IRIG-B12x gives IEEE 1344 protocol CF bits output. Similarly, we can configure IRIG-B
output for UTC time/ Local time effect of configuration will be on both IRIG-B 00x and IRIG-B 12x.To
configure IRIG-B please refer Telnet Appendix E1.
•
Configuration of IRIG-B time code using any other Ethernet port ex-
cept Ethernet port NTP1 and Serial port will not reflect on IRIG-B
output port.
•
All the IRIG-B time code will have same configuration as shown in
Telnet menu of Ethernet port NTP1 and in help command of serial
configuration.
9.2.2.7 Connecting IRIG-B Time Code:
GPS TIME SYNC UNIT MC-1-DE time code outputs are designed to handle multiple loads. The out-
put terminals of IRIG-B time code are BNC type. Input devices have different type of IRIG-B time
code input connectors. Co-axial cables can be connected directly from model MC-1-DE to end device.
To adapt twisted pair cabling with model MC-1-DE, use BNC Breakout or other similar adapter.
NOTE: In case of shielded twisted pair cabling do not connect shielding of cable to model MC-1-DE,
ground it at the receiver end.
Following factors come into effect by transmitting time code to multiple/single devices over long dis-
tance,
1) Resistive loss in cabling
2) Electromagnetic interference
3) Propagation delay
4) Input impedance of end device
1) Resistive loss in cabling: -Resistive loss in cabling affects the available output voltage at the
input device. Wire has a certain resistivity associated with it that is determined by its metallic compo-
sition, and resistance determined by the diameter and length.
2) Electromagnetic interference: -Electromagnetic interference (EMI) includes a variety of sources
of interfering signals, ranging from dc and low-frequency (50 or 60 Hz) all the way up through the RF
(Radio Frequency) and microwave region. All of these signals have the potential to interfere in one
way or another with the accurate and reliable distribution of timing signals.
3) Propagation Delay: -Electromagnetic waves travel at the speed of light (C) in free space/vacuum
and a fraction of that speed through cabling which cause delay in IRIG-B Time code output.
