SDI-TD-DMUX-4
Rev.
5
6
GPI alarms
Four alarms are present on the RJ45 connector. These four GPI signals indicate the same
status as the LEDs (see above):
−
GPI0: On => Power on, FPGA not configured
Off => Power on, FPGA configured
−
GPI1: On => One of the channels (1 or 2) in error
Off => Both channels (1 and 2) are OK
−
GPI2: On => One of the channels (3 or 4) in error
Off => Both channels (3 and 4) are OK
−
GPI3: On => No input signal *)
Off => Locked to electrical or optical input signal
*) When optical input is selected by GYDA-SC, alarm status is indicated only for optical input.
When electrical input is selected from GYDA-SC, status is indicated only for electrical input.
When GYDA-SC control is disabled or auto-select is chosen from GYDA-SC, an alarm will be
indicated only when both signals are lost.
An active alarm condition (on) means that the driver transistor is conducting to ground. The
power present alarm should always be active during normal operation.
6.1
GPI/ Data connections RJ45
The below table show the signals available on the GPI connector on the backplane.
Figure 8: RJ45 Connector for GPI Signals
RJ45 Pin Number
Description
8 GND
7 Not
Used
6 Not
Used
5 Not
Used
4 GPI3
3 GPI2
2 GPI1
1 GPI0
network-electronics.com | 16
