5 Fan-and-Power Check light: This amber light comes on and stays on if dcoutput from the power supply part of the fan-and-power-supply assembly fails or isdisabled. On 7133s that have the Remote Power On Control feature, the light alsocomes on and stays on when power is turned off at the using system or at theremote-power-on control unit.If the power supply fails completely, the light is turned on by power from one of theother fan-and-power-supply assemblies in the 7133. The light flashes if the fan fails.It is not visible when the back cover is closed.6 Power light: This green light is on when mainline electrical power is present inthe fan-and-power-supply assembly. It is not visible when the back cover is closed.| 7 Link Status (Ready) light (Model 600 only): This green light shows the status| of the port (for example, port 1) through which the bypass card is connected to the| SSA adapter:| 8 Mode light (Model 600 only): This light shows in which mode the bypass card is| operating.| 9 Link Status (Ready) light (Model 600 only): This green light shows the status| of the port (for example, port 2) through which the bypass card is connected to the| SSA adapter:| Status of Light| Meaning| Permanently on| The interface through the bypass card is fully operational.| Flashing| (two seconds on,| two seconds off)| The interface through the bypass card is not operational.| Off| The card is in Bypass state or in Forced Inline mode.| Status of Light| Meaning| Permanently on| (Amber)| The bypass card is switched to Bypass state.| Permanently on| (Green)| The bypass card is jumpered for Forced Inline mode.| Off| The bypass card is switched to Inline state.| Status of Light| Meaning| Permanently on| The interface through the bypass card is fully operational.| Flashing| (two seconds on,| two seconds off)| The interface through the bypass card is not operational.| Off| The card is in Bypass state or in Forced Inline mode.Chapter 1. Reference Information 1-7

IBM 7133 Series Service Manual