The SR1630GP system comes with a S3420GPLC board, which doesn't have a RMM3 connector. In the S3420GP family, only S3420GPLX and S3420GPRX have RMM3 connector.
However, for pre-OS remote management, you can use the CLI utility, which supports console redirection via SOL. To use CLI you'll need to do the following:
1. Configure BMC LAN channel on SR1630GP in BIOS. Note it should be different than the IP address of the OS installed.
2. Enable Console Redirection in BIOS.
3. Install CLI on another server or PC.
4. Launch CLI and connect to BMC LAN IP address.
Follow the CLI user guide for more details.