CHAPTER 4: CONNECTING TO DEVICES AND NETWORKS
IRIG-B CONNECTIONS
D400 SUBSTATION GATEWAY USER’S MANUAL
GENERAL
59
•
Modulated IRIG-B through a BNC connector
•
Pulse width coded IRIG-B (
TTL
) through a terminal block
•
Fiber Optic through a Receive (
RX
) 820-850 nm ST connector
Terminal blocks accept a range of 24 to 14 AWG [0.2 to 2.1 mm²] Recommended wire strip
length is 0.2" [5.0 mm]. Screws shall be torqued with tool setting of 4.2 in-lb [0.46 Nm]. A 3.0
to 3.5 mm flat screwdriver tip is recommended.
You can use the following glass optical fiber (GOF) cabling with the D400 Glass Optical
Fiber Serial adapter:
•
50/125 µm core/cladding multi-mode (gradient index) cable
•
62.5/125 µm core cladding multi-mode (gradient index) cable
•
100/140 µm core/cladding multi-mode (gradient index) cable
•
200 m core Hard-Clad Silica (HCS) multi-mode (step index) cable
You can use the following fiber optic terminations for D400 cabling:
•
ST Connectors
When calculating cable length, consider the following optical power levels:
•
Glass optical fiber receiver sensitivity is typically –25.4 dBm
LED transmitters are classified as IEC 60825-1 Accessible Emission Limit (AEL) Class
1M. Class 1M devices are considered eye safe to the unaided eye. Do not view directly
with optical instruments.
Figure 35: IRIG-B Input Adapter
IRIG-B distribution adapter
The IRIG-B Distribution Adapter (GE Item No. 520-0212LF) is an optional IRIG-B output card
to supply a pulse width coded IRIG-B (TTL) signal passed from the IRIG-B Input card to
attached IEDs. The IRIG-B Distribution card provides four channels on a single terminal
block. Each channel is capable of supplying a signal to up to four IEDs, for a total of 16
IEDs. The IRIG-B Distribution card plugs into a dedicated IRIG-B slot (slot 10) on the D400.
Terminal blocks accept a range of 24 to 14 AWG [0.2 to 2.1 mm²] Recommended wire strip
length is 0.2" [5.0 mm]. Screws shall be torqued with tool setting of 4.2 in-lb [0.46 Nm]. A 3.0
to 3.5 mm flat screwdriver tip is recommended.
Figure 36: IRIG-B Distribution Adapter
