RuggedCom RS416 - Manual (Page 32)

Ethernet Ports
32
RuggedCom ® RuggedServer™ RS416 Family Installation Guide rev118
Figure 24 shows layout of the BNC connectors on the IRIG-B I/O board. The LED in the
center of the board, indicated by the mark, reflects the status of the received IRIG-B
signal, and is described in Table 12.
Figure 24: IRIG-B daughter board BNC connections
LED Color Meaning
Off No IRIG-B signal detected
Red
Errors detected in received
IRIG-B signal
Green Received IRIG-B signal is good
Table 12: IRIG-B Daughter Board LED
4.2 IRIG-B Connection Considerations
The number of IRIG-B devices that can be connected to a given IRIG-B output is
dependent on the cabling type and length as well as the input impedances of connected
devices. Figure 25 shows a simplified circuit diagram of the interface between an IRIG-B
output and connected devices.
Vs
Rs Rc
R L /N
Source Cabling Device
Figure 25: IRIG-B Output Simplified Schematic
The maximum number of devices (N) that can be connected to the source is determined
by verifying that the source current (I
S
) required to drive the connected devices is less
than the maximum drive current the output can provide, and that the load voltage (V
L
)
seen by the connected devices is greater than their minimum required voltage. Refer to
section 6.3.2 for IRIG-B port specifications.
5 Ethernet Ports
5.1 Copper Ports
The RS416 may have up to 4 10/100BaseTX ports that allow connection to standard
CAT-5 UTP cable with RJ45 male connectors. All RJ45 Ethernet ports feature auto-