Chapter 4: Operation
4. Operation
4.1 LED Operation
The Industrial SFP/SFP contains four status LED indicators. Each LED is dual color and has three states: off, red, or green. A loss of signal on one SFP causes the TX of the other SFP to turn off. This action does not activate the red TX Fault LED.
LED |
| Color or State |
| |
| Red | OFF |
| Green |
| Card does not pass | Unit does not |
| Power is applied to the |
PWR | the | have power. |
| card. |
|
|
| All internal | |
|
|
|
| functions must pass |
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|
|
| before the PWR LED is |
|
|
|
| green. |
SD I | LED transmitter has | No active fault |
| Valid signal is detected |
SD 2 | an active fault. | on transmitter. |
| by the SFP and LED |
|
|
|
| transmitter is not in |
|
| LOS indication |
| fault. |
|
| on receiver. |
|
|
MSA | One or both SFPs | N/A |
| Indicates that both |
LEDs | are not installed or |
|
| SFPs with the same |
| not detected. The |
|
| speed are securely |
| TX inhibit must not |
|
| installed. |
| be active if a SFP is |
|
|
|
| missing.* Or, both |
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|
|
| SFPs are installed, |
|
|
|
| but their speed |
|
|
|
| settings are |
|
|
|
| different. This |
|
|
|
| condition disables |
|
|
|
| both SFPs. |
|
|
|
*To help in troubleshooting, the Link Loss (LL) feature is always ON. That is, if a LOS is detected on an incoming SFP port, the Optical transmitter on the other SFP port is turned OFF. This provides a Link Loss carry forward function to alert the device downstream of the existing problem. This function is "ON" in both directions at the same time. The LL function is inhibited if either SFP is not installed.
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