Irig-B - GE L90 Instruction Manual

3.2 WIRING
c) 10BASE-FL AND 100BASE-FX FIBER OPTIC PORTS
ENSURE THE DUST COVERS ARE INSTALLED WHEN THE FIBER IS NOT IN USE. DIRTY OR SCRATCHED
CONNECTORS CAN LEAD TO HIGH LOSSES ON A FIBER LINK.
CAUTION
OBSERVING ANY FIBER TRANSMITTER OUTPUT MAY CAUSE INJURY TO THE EYE.
CAUTION
The fiber optic communication ports allow for fast and efficient communications between relays at 10 Mbps or 100 Mbps.
Optical fiber may be connected to the relay supporting a wavelength of 820 nm in multi-mode or 1310 nm in multi-mode
and single-mode. The 10 Mbps rate is available for CPU modules 9G and 9H; 100Mbps is available for modules 9H, 9J, 9K,
9L, 9M, 9N, 9P, and 9R. The 9H, 9K, 9M, and 9R modules have a second pair of identical optical fiber transmitter and
receiver for redundancy.
The optical fiber sizes supported include 50/125 µm, 62.5/125 µm and 100/140 µm for 10 Mbps. The fiber optic port is
3
designed such that the response times will not vary for any core that is 100 µm or less in diameter, 62.5 µm for 100 Mbps.
For optical power budgeting, splices are required every 1 km for the transmitter/receiver pair. When splicing optical fibers,
the diameter and numerical aperture of each fiber must be the same. In order to engage or disengage the ST type connec-
tor, only a quarter turn of the coupling is required.
IRIG-B is a standard time code format that allows stamping of events to be synchronized among connected devices within
1 millisecond. The IRIG time code formats are serial, width-modulated codes which can be either DC level shifted or ampli-
tude modulated (AM). Third party equipment is available for generating the IRIG-B signal; this equipment may use a GPS
satellite system to obtain the time reference so that devices at different geographic locations can also be synchronized.
GPS CONNECTION
OPTIONAL

IRIG-B

TIME CODE
GENERATOR
(DC SHIFT OR
AMPLITUDE MODULATED
SIGNAL CAN BE USED)
3-26
GPS SATELLITE SYSTEM
RG58/59 COAXIAL CABLE
+
-
TO OTHER DEVICES
Figure 3–26: IRIG-B CONNECTION
L90 Line Current Differential System
RELAY
IRIG-B(+)
4B
IRIG-B(-)
4A
BNC (IN)
BNC (OUT)
(DC-SHIFT ONLY)
3 HARDWARE
3.2.10 IRIG-B
RECEIVER
REPEATER
827756A5.CDR
GE Multilin