Communication Ports
RuggedCom
®
- Rev.122
38
RuggedRouter
®
RX1000 Family
4.10.3 IRIG-B Outputs
The PTP Card supports both IRIG-B outputs in both Amplitude Modulated (AM) and
Pulse Width Modulation (PWM) formats. Specifically, for the AM output IRIG-B122 &
IRIG-B123 are supported and for the PWM IRIG-B002 & IRIG-B003 are supported.
Enabling of the AM and PWM outputs is done through software.
The number of IRIG-B devices that can be connected to the AM or PWM source is
dependent on the cabling type and length as well as the input impedances of the
devices. Figure 34 shows a simplified circuit diagram of the interface between the
IRIG-B source and connected devices.
V s
R s
R c
R
L
/N
S o u rc e
C a b lin g
D e v ic e
Figure 34: IRIG-B Simplified Schematic
The maximum number of devices (N) that can be connected to the source is
determined by checking if the source current (I
S
) required to drive the connected
devices is less than the maximum drive current the source can provide, and verifying
that the load voltage (V
L
) the connected devices see is greater than the minimum
required voltage.
Parameter
Typical Value
Output Current (I
S
)
40 mA total between two output ports
Output Voltage (V
S
)
5 V
p-p
Output Impedance (R
S
)
25
Ω
Table 14: IRIG-B Output Specifications
4.10.4 Pulse per Second Output (PPS)
The PTP Card supports one Pulse-Per-Second output. When enabled through
software, it outputs a 5V pulse every second.
