Irig-B Connection Considerations - Siemens RUGGEDCOM RS416 Installation Manual

Chapter 3
Communication Ports
Figure 27: IRIG-B Daughter Board BNC Connections
LED Color
Off
Red
Green
Section 3.5.2

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. The following shows a simplified circuit
diagram of the interface between an IRIG-B output and connected devices.
Figure 28: IRIG-B Simplified Schematic
1. Source 2. Cabling
The maximum number of devices (N) that can be connected to the source is determined by verifying that the
source current (IS) required to drive the connected devices is less than the maximum drive current the output can
provide, and that the load voltage (VL) seen by the connected devices is greater than their minimum required
voltage. For IRIG-B port specifications, refer to
24
1
3. Device
Meaning
No IRIG-B signal detected
Errors detected in received IRIG-B signal
Received IRIG-B signal is good
2
Section 4.6, "IRIG-B Ports".
RUGGEDCOM RS416
Installation Guide
3
IRIG-B Connection Considerations