(edfa-front-panel)=

# Front panel

![Front panel](/images/bidi-cplus1572-front.png)

| Item | Description |
| -- | -- |
| C-BAND WEST / EAST | FC/APC ports of the C-band module (1540–1547 nm) |
| L-BAND WEST / EAST | FC/APC ports of the 1572 nm module |
| LEDs | C-Band, STATUS, UID, L-Band, SFP |
| PWR (micro-USB) | Serial console |
| USB | _TODO: purpose_ |
| eth0, eth1 | Gigabit Ethernet management ports (eth0 is the left one, nearer the micro-USB port) |
| SFP (labelled **OSC**) | Onboard SFP cage. In this configuration, without the optical supervisory channel, it works as an additional Ethernet port bridged with eth0 and eth1. See {ref}`management-ports`. |

## STATUS LED

| State | Meaning |
| -- | -- |
| Solid green | System is running without any active alarm, both power supplies connected |
| Solid red | Active alarm, for example only one power supply connected |